Companies: 10,793     total market cap: $134.237 T
โ‚ฌEUR๐Ÿ‡ช๐Ÿ‡บโ‚นINR๐Ÿ‡ฎ๐Ÿ‡ณยฃGBP๐Ÿ‡ฌ๐Ÿ‡ง$CAD๐Ÿ‡จ๐Ÿ‡ฆ$AUD๐Ÿ‡ฆ๐Ÿ‡บ$NZD๐Ÿ‡ณ๐Ÿ‡ฟ$HKD๐Ÿ‡ญ๐Ÿ‡ฐ$SGD๐Ÿ‡ธ๐Ÿ‡ฌ
Northfield Bancorp
NFBK
#6993
Rank
$0.56 B
Marketcap
๐Ÿ‡บ๐Ÿ‡ธ United States
Country
$13.56
Share price
0.15%
Change (1 day)
38.23%
Change (1 year)
๐Ÿฆ Banks๐Ÿ’ณ Financial services
Categories
  1. Northfield Bancorp
  2. Quarterly Reports (10-Q)
  3. Financial Year FY2020 Q3

Northfield Bancorp - 10-Q quarterly report FY2020 Q3


Text size:
000149322512/312020Q3falseP5Y00014932252020-01-012020-09-30xbrli:shares00014932252020-10-31iso4217:USD00014932252020-09-3000014932252019-12-31iso4217:USDxbrli:shares00014932252020-07-012020-09-3000014932252019-07-012019-09-3000014932252019-01-012019-09-300001493225us-gaap:CommonStockMember2019-06-300001493225us-gaap:AdditionalPaidInCapitalMember2019-06-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2019-06-300001493225us-gaap:RetainedEarningsMember2019-06-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-06-300001493225us-gaap:TreasuryStockMember2019-06-3000014932252019-06-300001493225us-gaap:RetainedEarningsMember2019-07-012019-09-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-07-012019-09-300001493225us-gaap:AdditionalPaidInCapitalMember2019-07-012019-09-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2019-07-012019-09-300001493225us-gaap:CommonStockMember2019-07-012019-09-300001493225us-gaap:TreasuryStockMember2019-07-012019-09-300001493225us-gaap:CommonStockMember2019-09-300001493225us-gaap:AdditionalPaidInCapitalMember2019-09-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2019-09-300001493225us-gaap:RetainedEarningsMember2019-09-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-09-300001493225us-gaap:TreasuryStockMember2019-09-3000014932252019-09-300001493225us-gaap:CommonStockMember2020-06-300001493225us-gaap:AdditionalPaidInCapitalMember2020-06-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2020-06-300001493225us-gaap:RetainedEarningsMember2020-06-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-06-300001493225us-gaap:TreasuryStockMember2020-06-3000014932252020-06-300001493225us-gaap:RetainedEarningsMember2020-07-012020-09-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-07-012020-09-300001493225us-gaap:AdditionalPaidInCapitalMember2020-07-012020-09-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2020-07-012020-09-300001493225us-gaap:CommonStockMember2020-07-012020-09-300001493225us-gaap:TreasuryStockMember2020-07-012020-09-300001493225us-gaap:CommonStockMember2020-09-300001493225us-gaap:AdditionalPaidInCapitalMember2020-09-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2020-09-300001493225us-gaap:RetainedEarningsMember2020-09-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-09-300001493225us-gaap:TreasuryStockMember2020-09-300001493225us-gaap:CommonStockMember2018-12-310001493225us-gaap:AdditionalPaidInCapitalMember2018-12-310001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2018-12-310001493225us-gaap:RetainedEarningsMember2018-12-310001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2018-12-310001493225us-gaap:TreasuryStockMember2018-12-3100014932252018-12-310001493225us-gaap:RetainedEarningsMember2019-01-012019-09-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-01-012019-09-300001493225us-gaap:AdditionalPaidInCapitalMember2019-01-012019-09-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2019-01-012019-09-300001493225us-gaap:CommonStockMember2019-01-012019-09-300001493225us-gaap:TreasuryStockMember2019-01-012019-09-300001493225us-gaap:CommonStockMember2019-12-310001493225us-gaap:AdditionalPaidInCapitalMember2019-12-310001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2019-12-310001493225us-gaap:RetainedEarningsMember2019-12-310001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2019-12-310001493225us-gaap:TreasuryStockMember2019-12-310001493225us-gaap:RetainedEarningsMember2020-01-012020-09-300001493225us-gaap:AccumulatedOtherComprehensiveIncomeMember2020-01-012020-09-300001493225us-gaap:AdditionalPaidInCapitalMember2020-01-012020-09-300001493225nfbk:UnallocatedCommonStockHeldByEmployeeStockOwnershipPlanMember2020-01-012020-09-300001493225us-gaap:CommonStockMember2020-01-012020-09-300001493225us-gaap:TreasuryStockMember2020-01-012020-09-300001493225nfbk:COVID19Member2020-01-012020-09-30nfbk:loan0001493225nfbk:COVID19Member2020-09-300001493225nfbk:COVID19Membernfbk:VSBBancorpIncMember2020-09-300001493225nfbk:COVID19Member2020-01-012020-09-300001493225nfbk:VSBBancorpIncMember2020-07-010001493225nfbk:VSBBancorpIncMember2020-07-012020-07-010001493225nfbk:VSBBancorpIncMember2020-07-012020-09-300001493225nfbk:VSBBancorpIncMember2020-01-012020-09-300001493225nfbk:VSBBancorpIncMember2020-07-010001493225us-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-09-300001493225us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMembernfbk:PassThroughCertificatesMember2020-09-300001493225us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMembernfbk:RealEstateMortgageInvestmentsConduitsMember2020-09-300001493225nfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMembernfbk:RealEstateMortgageInvestmentsConduitsMember2020-09-300001493225nfbk:RealEstateMortgageInvestmentsConduitsMember2020-09-300001493225us-gaap:OtherDebtSecuritiesMemberus-gaap:MunicipalBondsMember2020-09-300001493225us-gaap:CorporateBondSecuritiesMemberus-gaap:OtherDebtSecuritiesMember2020-09-300001493225us-gaap:AssetBackedSecuritiesMemberus-gaap:OtherDebtSecuritiesMember2020-09-300001493225us-gaap:OtherDebtSecuritiesMember2020-09-300001493225us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMembernfbk:PassThroughCertificatesMember2019-12-310001493225us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMembernfbk:RealEstateMortgageInvestmentsConduitsMember2019-12-310001493225nfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMembernfbk:RealEstateMortgageInvestmentsConduitsMember2019-12-310001493225nfbk:RealEstateMortgageInvestmentsConduitsMember2019-12-310001493225us-gaap:OtherDebtSecuritiesMemberus-gaap:MunicipalBondsMember2019-12-310001493225us-gaap:CorporateBondSecuritiesMemberus-gaap:OtherDebtSecuritiesMember2019-12-310001493225us-gaap:OtherDebtSecuritiesMember2019-12-310001493225nfbk:OtherThanMortgageBackedSecuritiesMember2020-09-30nfbk:security0001493225us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap:MortgagesMembernfbk:PassThroughMember2020-09-300001493225us-gaap:USGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap:MortgagesMembernfbk:NonPassThroughMember2020-09-300001493225us-gaap:MortgagesMemberus-gaap:MunicipalBondsMember2020-09-300001493225nfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2020-09-300001493225nfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2019-12-310001493225us-gaap:MoneyMarketFundsMember2020-09-300001493225us-gaap:MoneyMarketFundsMember2019-12-310001493225nfbk:SmallBusinessAdministrationLoanFundMember2019-12-310001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-12-310001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-12-310001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-12-310001493225us-gaap:FinancialAssetOriginatedMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancialAssetOriginatedMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-12-310001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-12-310001493225us-gaap:FinancialAssetOriginatedMember2020-09-300001493225us-gaap:FinancialAssetOriginatedMember2019-12-310001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2020-09-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225srt:MultifamilyMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225srt:MultifamilyMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:CommercialLoanMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:CommercialLoanMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:ConstructionAndLandLoansMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:ConstructionAndLandLoansMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-12-310001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-12-310001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-12-310001493225nfbk:PaycheckProtectionProgramMemberus-gaap:FinancialAssetOriginatedMember2020-09-300001493225nfbk:PaycheckProtectionProgramMemberus-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-09-300001493225nfbk:PaycheckProtectionProgramMemberus-gaap:FinancialAssetOriginatedMember2019-12-31xbrli:pure0001493225us-gaap:CommercialRealEstateMember2020-01-012020-09-300001493225nfbk:CommercialAndIndustrialLoansMember2020-01-012020-09-300001493225us-gaap:CommercialRealEstateMember2019-01-012019-12-310001493225nfbk:CommercialAndIndustrialLoansMember2019-01-012019-12-310001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-06-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-06-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-06-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-06-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2020-06-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-06-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-06-300001493225us-gaap:FinancialAssetOriginatedMember2020-06-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2020-06-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-06-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2020-07-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225us-gaap:FinancialAssetOriginatedMember2020-07-012020-09-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2020-07-012020-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-07-012020-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-06-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-06-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-06-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-06-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2019-06-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-06-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-06-300001493225us-gaap:FinancialAssetOriginatedMember2019-06-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2019-06-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-06-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2019-07-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225us-gaap:FinancialAssetOriginatedMember2019-07-012019-09-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2019-07-012019-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-07-012019-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-09-300001493225us-gaap:FinancialAssetOriginatedMember2019-09-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2019-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2020-01-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225us-gaap:FinancialAssetOriginatedMember2020-01-012020-09-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2020-01-012020-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2020-01-012020-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2018-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2018-12-310001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2018-12-310001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2018-12-310001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2018-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2018-12-310001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2018-12-310001493225us-gaap:FinancialAssetOriginatedMember2018-12-310001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2018-12-310001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2018-12-310001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMemberus-gaap:HomeEquityMember2019-01-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225us-gaap:FinancialAssetOriginatedMember2019-01-012019-09-300001493225us-gaap:FinancialAssetAcquiredWithCreditDeteriorationMember2019-01-012019-09-300001493225us-gaap:FinancialAssetAcquiredAndNoCreditDeteriorationMember2019-01-012019-09-300001493225us-gaap:CommercialRealEstateMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMember2020-09-300001493225us-gaap:PassMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225us-gaap:PassMember2020-09-300001493225nfbk:LessThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:ConstructionAndLandLoansMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:OtherPortfolioSegmentMemberus-gaap:SpecialMentionMember2020-09-300001493225us-gaap:SpecialMentionMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:ConstructionAndLandLoansMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2020-09-300001493225us-gaap:SubstandardMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225us-gaap:SubstandardMember2020-09-300001493225nfbk:LessThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMember2020-09-300001493225nfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMember2019-12-310001493225us-gaap:PassMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225us-gaap:PassMember2019-12-310001493225nfbk:LessThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:ConstructionAndLandLoansMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2019-12-310001493225nfbk:OtherPortfolioSegmentMemberus-gaap:SpecialMentionMember2019-12-310001493225us-gaap:SpecialMentionMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:ConstructionAndLandLoansMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2019-12-310001493225us-gaap:SubstandardMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225us-gaap:SubstandardMember2019-12-310001493225nfbk:LessThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialPortfolioSegmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMember2019-12-310001493225nfbk:OtherPortfolioSegmentMember2019-12-3100014932252020-01-012020-03-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225us-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225us-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225us-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2020-09-300001493225us-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225us-gaap:SubstandardMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225us-gaap:SubstandardMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225us-gaap:NonperformingFinancingReceivableMemberus-gaap:FinancingReceivablesEqualToGreaterThan90DaysPastDueMember2019-12-310001493225us-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMember2020-09-300001493225nfbk:OtherLoansMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:OtherLoansMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:OtherLoansMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:OtherLoansMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:OtherPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:OtherLoansMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansHeldForInvestmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PassMembernfbk:OtherPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PassMembernfbk:OtherPortfolioSegmentMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:LoansAcquiredMember2020-09-300001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:TotalLoansIncludeLoansAcquiredMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:TotalLoansIncludeLoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:TotalLoansIncludeLoansAcquiredMemberus-gaap:PerformingFinancingReceivableMember2020-09-300001493225nfbk:TotalLoansIncludeLoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2020-09-300001493225nfbk:TotalLoansIncludeLoansAcquiredMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMembernfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansHeldForInvestmentMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SpecialMentionMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:SubstandardMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:LoansHeldForInvestmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:OtherPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PassMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansHeldForInvestmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:CommercialLoanMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:ConstructionAndLandLoansMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LessThan35LtvMembernfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PassMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:CommercialAndIndustrialPortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OtherPortfolioSegmentMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:OtherPortfolioSegmentMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:FinancingReceivables1To29DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:LoansAcquiredMember2019-12-310001493225us-gaap:FinancingReceivables1To29DaysPastDueMembernfbk:TotalLoansIncludeLoansAcquiredMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:TotalLoansIncludeLoansAcquiredMembernfbk:FinancingReceivableRecordedInvestment30To89DaysPastDueMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:TotalLoansIncludeLoansAcquiredMemberus-gaap:PerformingFinancingReceivableMember2019-12-310001493225nfbk:TotalLoansIncludeLoansAcquiredMemberus-gaap:NonperformingFinancingReceivableMember2019-12-310001493225nfbk:TotalLoansIncludeLoansAcquiredMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMemberus-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:CommercialLoanMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:LessThan60LtvMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:PassMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan60LtvMembernfbk:OneToFourFamilyResidentialMortgageMemberus-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:LessThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:PassMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMembersrt:MultifamilyMemberus-gaap:SpecialMentionMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:EqualToOrGreaterThan35LtvMemberus-gaap:SubstandardMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225us-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-07-012020-09-300001493225us-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-07-012019-09-300001493225us-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-01-012020-09-300001493225us-gaap:PassMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-01-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2020-07-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2019-07-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2020-01-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SubstandardMember2019-01-012019-09-300001493225us-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-07-012020-09-300001493225us-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-07-012019-09-300001493225us-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-01-012020-09-300001493225us-gaap:SubstandardMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-01-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2020-07-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2019-07-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2020-01-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:SpecialMentionMember2019-01-012019-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225us-gaap:CommercialLoanMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225nfbk:OneToFourFamilyResidentialMortgageMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-07-012020-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-07-012019-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-01-012020-09-300001493225srt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-01-012019-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-07-012020-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-07-012019-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-01-012020-09-300001493225nfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-01-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMember2020-07-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMember2019-07-012019-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMember2020-01-012020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMember2019-01-012019-09-300001493225nfbk:ResidentialMember2020-01-012020-09-300001493225us-gaap:CommercialMortgageBackedSecuritiesMember2020-01-012020-09-30nfbk:contract0001493225nfbk:OneToFourFamilyResidentialMortgageMember2019-01-012019-09-300001493225us-gaap:CommercialMortgageBackedSecuritiesMember2019-01-012019-09-30nfbk:numberOfBorrowers0001493225nfbk:COVID19Member2020-09-300001493225nfbk:PrincipalDeferralInterestOnlyMembernfbk:COVID19Member2020-01-012020-09-300001493225nfbk:PrincipalDeferralInterestOnlyMembernfbk:COVID19Member2020-09-300001493225us-gaap:DeferrableNotesMembernfbk:COVID19Member2020-01-012020-09-300001493225us-gaap:DeferrableNotesMembernfbk:COVID19Member2020-09-300001493225nfbk:TwoThousandNineteenEquityIncentivePlanMember2019-05-220001493225nfbk:TwoThousandNineteenEquityIncentivePlanMembernfbk:RestrictedStockAndRestrictedStockUnitsRSUsMember2019-05-220001493225nfbk:TwoThousandNineteenEquityIncentivePlanMember2019-05-222020-09-3000014932252019-01-012019-12-310001493225us-gaap:EmployeeStockOptionMember2020-09-300001493225us-gaap:EmployeeStockOptionMember2020-01-012020-09-300001493225nfbk:TwoThousandNineteenEquityIncentivePlanMemberus-gaap:RestrictedStockUnitsRSUMember2020-02-172020-02-170001493225nfbk:TwoThousandNineteenEquityIncentivePlanMemberus-gaap:ShareBasedCompensationAwardTrancheOneMemberus-gaap:RestrictedStockUnitsRSUMember2020-02-172020-02-170001493225us-gaap:ShareBasedCompensationAwardTrancheTwoMembernfbk:TwoThousandNineteenEquityIncentivePlanMemberus-gaap:RestrictedStockUnitsRSUMember2020-02-172020-02-170001493225nfbk:TwoThousandNineteenEquityIncentivePlanMemberus-gaap:PerformanceSharesMember2020-02-172020-02-170001493225us-gaap:PerformanceSharesMembersrt:MinimumMember2020-02-172020-02-170001493225us-gaap:PerformanceSharesMembersrt:MaximumMember2020-02-172020-02-170001493225us-gaap:RestrictedStockMember2020-09-300001493225us-gaap:RestrictedStockMember2020-01-012020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USGovernmentAgenciesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USGovernmentAgenciesDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Membernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Membernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CorporateBondSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:AssetBackedSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:AssetBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:AssetBackedSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherDebtSecuritiesMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:CommercialRealEstateMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CommercialRealEstateMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:CommercialRealEstateMemberus-gaap:FairValueInputsLevel2Membernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:CommercialRealEstateMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Membersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Membersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Membernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Membernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Membernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Membernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueInputsLevel3Membernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMember2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2020-09-300001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2020-09-300001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMember2020-09-300001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Membernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Membernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membernfbk:USGovernmentsponsoredEnterprisesDebtSecuritiesPassThroughCertificatesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membernfbk:USGovernmentSponsoredEnterprisesDebtSecuritiesREMICsMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMembernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Membernfbk:NonUsGovernmentSponsoredEnterprisesDebtSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:MortgageBackedSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:MortgageBackedSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:MortgageBackedSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:USStatesAndPoliticalSubdivisionsMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:USStatesAndPoliticalSubdivisionsMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:CorporateBondSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:CorporateBondSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:OtherDebtSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:OtherDebtSecuritiesMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Memberus-gaap:OtherDebtSecuritiesMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMember2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueMeasurementsRecurringMemberus-gaap:FairValueInputsLevel3Member2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:CommercialRealEstateMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Memberus-gaap:CommercialRealEstateMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:CommercialRealEstateMemberus-gaap:FairValueInputsLevel2Membernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:CommercialRealEstateMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Membersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Membersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMembersrt:MultifamilyMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Membernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Membernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMemberus-gaap:HomeEquityMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Membernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Membernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMembernfbk:RealEstatePortfolioSegmentMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225nfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueInputsLevel3Membernfbk:CommercialAndIndustrialPortfolioSegmentMemberus-gaap:FairValueMeasurementsNonrecurringMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMember2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel1Member2019-12-310001493225us-gaap:FairValueMeasurementsNonrecurringMemberus-gaap:FairValueInputsLevel2Member2019-12-310001493225us-gaap:FairValueInputsLevel3Memberus-gaap:FairValueMeasurementsNonrecurringMember2019-12-310001493225us-gaap:MarketApproachValuationTechniqueMembernfbk:MeasurementInputDiscountForCostsToSellMember2020-09-300001493225us-gaap:MarketApproachValuationTechniqueMembernfbk:MeasurementInputDiscountForCostsToSellMember2019-12-310001493225us-gaap:MarketApproachValuationTechniqueMembernfbk:MeasurementInputDiscountForQuickSaleMember2020-09-300001493225us-gaap:MarketApproachValuationTechniqueMembernfbk:MeasurementInputDiscountForQuickSaleMember2019-12-310001493225us-gaap:MeasurementInputDiscountRateMembersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2020-09-300001493225us-gaap:MeasurementInputDiscountRateMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMember2020-09-300001493225us-gaap:MeasurementInputDiscountRateMembersrt:MinimumMemberus-gaap:ValuationTechniqueDiscountedCashFlowMember2019-12-310001493225us-gaap:MeasurementInputDiscountRateMemberus-gaap:ValuationTechniqueDiscountedCashFlowMembersrt:MaximumMember2019-12-310001493225us-gaap:CarryingReportedAmountFairValueDisclosureMember2020-09-300001493225us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300001493225us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300001493225us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300001493225us-gaap:EstimateOfFairValueFairValueDisclosureMember2020-09-300001493225us-gaap:CarryingReportedAmountFairValueDisclosureMember2019-12-310001493225us-gaap:FairValueInputsLevel1Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001493225us-gaap:FairValueInputsLevel2Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001493225us-gaap:FairValueInputsLevel3Memberus-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001493225us-gaap:EstimateOfFairValueFairValueDisclosureMember2019-12-310001493225srt:MinimumMember2020-09-300001493225srt:MaximumMember2020-09-300001493225us-gaap:BankServicingMember2020-07-012020-09-300001493225us-gaap:BankServicingMember2019-07-012019-09-300001493225us-gaap:BankServicingMember2020-01-012020-09-300001493225us-gaap:BankServicingMember2019-01-012019-09-300001493225us-gaap:DebitCardMember2020-07-012020-09-300001493225us-gaap:DebitCardMember2019-07-012019-09-300001493225us-gaap:DebitCardMember2020-01-012020-09-300001493225us-gaap:DebitCardMember2019-01-012019-09-300001493225us-gaap:InvestmentAdviceMember2020-07-012020-09-300001493225us-gaap:InvestmentAdviceMember2019-07-012019-09-300001493225us-gaap:InvestmentAdviceMember2020-01-012020-09-300001493225us-gaap:InvestmentAdviceMember2019-01-012019-09-30nfbk:instrument0001493225us-gaap:InterestRateSwapMember2020-09-300001493225us-gaap:InterestRateSwapMember2019-12-31

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549 
FORM 10-Q
 
☒    QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934
For the quarterly period ended September 30, 2020
or
☐    TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
 
For transition period from               to 
Commission File Number 001-35791
Northfield Bancorp, Inc.
(Exact name of registrant as specified in its charter) 
Delaware 80-0882592
(State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification No.)
581 Main Street,Woodbridge,New Jersey 07095
(Address of principal executive offices) (Zip Code)
 
Registrant’s telephone number, including area code: (732) 499-7200
 
Not Applicable
(Former name, former address, and former fiscal year, if changed since last report)
Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading SymbolName of exchange on which registered
Common stock, par value $0.01 per shareNFBKThe NASDAQ Stock Market LLC
 
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes ☒    No ☐
Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for shorter period that the registrant was required to submit such files).  Yes ☒    No ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act:
Large accelerated filer☒Accelerated filer☐
Non-accelerated filer☐Smaller reporting company☐
Emerging growth company☐
 
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐


Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ☐ No ☒.
As of October 31, 2020, the registrant had 53,122,550 shares of Common Stock, par value $0.01 per share, issued and outstanding.




NORTHFIELD BANCORP, INC.
Form 10-Q Quarterly Report
Table of Contents
  Page
PART I - FINANCIAL INFORMATION 
Item 1.
4
Item 2.
49
Item 3.
68
Item 4.
70
   
PART II - OTHER INFORMATION 
Item 1.
71
Item 1A.
71
Item 2.
71
Item 3.
71
Item 4.
71
Item 5.
71
Item 6.
72
 
73
3

PART I
ITEM 1.     FINANCIAL STATEMENTS

NORTHFIELD BANCORP, INC.
CONSOLIDATED BALANCE SHEETS
(Unaudited) (In thousands, except share amounts)
 September 30,
2020		December 31, 2019
ASSETS:  
Cash and due from banks$18,273 $15,409 
Interest-bearing deposits in other financial institutions332,566 132,409 
Total cash and cash equivalents350,839 147,818 
Trading securities10,993 11,222 
Debt securities available-for-sale, at estimated fair value1,171,430 1,138,352 
Debt securities held-to-maturity, at amortized cost 8,106 8,762 
(estimated fair value of $8,475 at September 30, 2020, and $8,886 at December 31, 2019)
Equity securities4,502 3,341 
Originated loans held-for-investment, net3,215,509 2,987,067 
Loans acquired497,640 432,653 
Purchased credit-impaired (“PCI”) loans held-for-investment18,468 17,365 
Loans held-for-investment, net3,731,617 3,437,085 
Allowance for loan losses(38,716)(28,707)
Net loans held-for-investment3,692,901 3,408,378 
Accrued interest receivable14,061 14,609 
Bank owned life insurance161,806 153,459 
Federal Home Loan Bank of New York stock, at cost29,766 39,575 
Premises and equipment, net27,980 25,659 
Goodwill41,594 38,411 
Operating lease right-of-use assets43,600 39,504 
Other assets31,262 26,212 
Total assets$5,588,840 $5,055,302 
LIABILITIES AND STOCKHOLDERS’ EQUITY:  
LIABILITIES:  
Deposits$4,121,164 $3,408,233 
Securities sold under agreements to repurchase75,000 75,000 
Other borrowings541,905 782,004 
Operating lease liabilities48,090 44,069 
Advance payments by borrowers for taxes and insurance17,329 20,045 
Accrued expenses and other liabilities27,954 30,098 
Total liabilities4,831,442 4,359,449 
STOCKHOLDERS’ EQUITY:  
Preferred stock, $0.01 par value: 25,000,000 shares authorized, none issued or outstanding
— — 
Common stock, $0.01 par value: 150,000,000 shares authorized, 64,796,453 shares issued at
  
September 30, 2020 and December 31, 2019, 53,124,898 and 49,175,347 outstanding at September 30, 2020, and December 31, 2019, respectively
648 609 
Additional paid-in-capital590,316 548,486 
Unallocated common stock held by employee stock ownership plan(18,993)(19,740)
Retained earnings330,602 322,581 
Accumulated other comprehensive income 14,407 4,699 
Treasury stock at cost: 11,671,555 and 11,758,360 shares at September 30, 2020, and December 31, 2019, respectively
(159,582)(160,782)
Total stockholders’ equity757,398 695,853 
Total liabilities and stockholders’ equity$5,588,840 $5,055,302 
See accompanying notes to unaudited consolidated financial statements.
4

NORTHFIELD BANCORP, INC.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME 
(Unaudited) (In thousands, except per share data) 
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Interest income:    
Loans$37,025 $35,285 $107,705 $101,183 
Mortgage-backed securities3,422 5,409 13,348 14,082 
Other securities541 1,511 2,342 5,075 
Federal Home Loan Bank of New York dividends410 396 1,443 1,138 
Deposits in other financial institutions59 246 262 1,028 
Total interest income41,457 42,847 125,100 122,506 
Interest expense:  
Deposits5,643 10,516 22,395 31,312 
Borrowings3,206 3,511 9,934 7,885 
Total interest expense8,849 14,027 32,329 39,197 
Net interest income32,608 28,820 92,771 83,309 
Provision (credit) for loan losses165 (1,300)10,269 (750)
Net interest income after provision for loan losses32,443 30,120 82,502 84,059 
Non-interest income:  
Fees and service charges for customer services1,009 1,286 2,795 3,633 
Income on bank owned life insurance894 3,268 2,635 5,071 
Gains on available-for-sale debt securities, net45 123 105 337 
Gains on trading securities, net763 28 397 1,457 
Gains on sale of loans— — 665 — 
Other311 28 772 115 
Total non-interest income3,022 4,733 7,369 10,613 
Non-interest expense:  
Compensation and employee benefits13,306 9,033 31,039 29,890 
Occupancy3,540 3,084 9,618 9,486 
Furniture and equipment425 280 1,107 804 
Data processing3,058 1,517 6,130 4,217 
Professional fees1,216 938 3,370 2,496 
Advertising424 746 1,585 2,841 
FDIC insurance360 5 576 537 
Other1,459 1,266 3,901 4,552 
Total non-interest expense23,788 16,869 57,326 54,823 
Income before income tax expense11,677 17,984 32,545 39,849 
Income tax expense3,095 4,845 8,619 9,735 
Net income$8,582 $13,139 $23,926 $30,114 
Net income per common share:  
Basic$0.17 $0.28 $0.50 $0.64 
Diluted$0.17 $0.28 $0.50 $0.64 
See accompanying notes to unaudited consolidated financial statements.
5

NORTHFIELD BANCORP, INC.
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - (Continued)
(Unaudited) (In thousands) 
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Net Income$8,582 $13,139 $23,926 $30,114 
Other comprehensive income:
Unrealized gains on debt securities available-for-sale:  
Net unrealized holding (losses) gains (328)1,549 13,585 20,242 
Less: reclassification adjustment for net gains included in net income (45)(123)(105)(337)
Net unrealized (losses) gains(373)1,426 13,480 19,905 
Income tax benefit (expense) related to net unrealized holding (losses) gains on debt securities available-for-sale 92 (434)(3,802)(5,666)
Income tax expense related to reclassification adjustment for gains included in net income13 34 30 94 
Other comprehensive (loss) income, net of tax(268)1,026 9,708 14,333 
Comprehensive income $8,314 $14,165 $33,634 $44,447 




































See accompanying notes to unaudited consolidated financial statements.
6

NORTHFIELD BANCORP, INC.
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY
Three Months Ended September 30, 2020 and 2019
(Unaudited) (In thousands, except share data) 
    
    
 Common Stock
 Shares Outstanding Par ValueAdditional Paid-in CapitalUnallocated Common Stock Held by the Employee Stock Ownership PlanRetained EarningsAccumulated Other Comprehensive Income (loss) Net of taxTreasury StockTotal Stockholders' Equity
Balance at June 30, 2019 49,112,139 $609 $548,197 $(20,491)$309,594 $4,160 $(160,976)$681,093 
Net income13,139 13,139 
Other comprehensive loss, net of tax1,026 1,026 
ESOP shares allocated or committed to be released231 255 486 
Stock compensation expense425 425 
Exercise of stock options, net407,844 (1,018)5,564 4,546 
Cash dividends declared and paid $0.11 per common share)
(5,141)(5,141)
Repurchase of treasury stock (average cost of $15.31 per share)
(365,105)(5,634)(5,634)
Balance at September 30, 201949,154,878 $609 $547,835 $(20,236)$317,592 $5,186 $(161,046)$689,940 
Balance at June 30, 202049,263,377 $609 $548,495 $(19,244)$327,606 $14,675 $(159,565)$712,576 
Net income8,582 8,582 
Other comprehensive loss, net of tax(268)(268)
ESOP shares allocated or committed to be released50 251 301 
Stock compensation expense346 346 
Forfeitures of restricted stock(1,225)17 (17)— 
Cash dividends declared and paid ($0.11 per common share)
(5,586)(5,586)
Issuance of stock for VSB Bancorp, Inc. acquisition3,862,746 39 41,408 41,447 
Balance at September 30, 202053,124,898 $648 $590,316 $(18,993)$330,602 $14,407 (159,582)$757,398 








See accompanying notes to unaudited consolidated financial statements.
7

NORTHFIELD BANCORP, INC.
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY
Nine Months Ended September 30, 2020 and 2019
(Unaudited) (In thousands, except share data) 
    
 Common Stock
 Shares Outstanding Par ValueAdditional Paid-in CapitalUnallocated Common Stock Held by the Employee Stock Ownership PlanRetained EarningsAccumulated Other Comprehensive Income (loss) Net of taxTreasury StockTotal Stockholders' Equity
Balance at December 31, 201849,635,673 $609 $546,219 $(20,992)$302,544 $(9,147)$(152,794)$666,439 
Net income    30,114   30,114 
Other comprehensive income, net of tax     14,333  14,333 
ESOP shares allocated or committed to be released  623 756    1,379 
Stock compensation expense  2,865     2,865 
Forfeitures of restricted stock(8,000)118 (118)— 
Exercise of stock options, net555,805  (1,990)  7,565 5,575 
Cash dividends declared and paid ($0.33 per common share)
    (15,066)  (15,066)
Repurchase of treasury stock (average cost of $15.23 per share)
(1,028,600)     (15,699)(15,699)
Balance at September 30, 201949,154,878 $609 $547,835 $(20,236)$317,592 $5,186 $(161,046)$689,940 
Balance at December 31, 201949,175,347 $609 $548,486 $(19,740)$322,581 $4,699 $(160,782)$695,853 
Net income    23,926   23,926 
Other comprehensive income, net of tax     9,708  9,708 
ESOP shares allocated or committed to be released  327 747    1,074 
Stock compensation expense  1,227    1,227 
Issuance of restricted stock83,744  (1,145)   1,145 — 
Forfeitures of restricted stock(1,225)17 (17)
Exercise of stock options, net13,000  (4)  179 175 
Cash dividends declared and paid ($0.33 per common share)
    (15,905)  (15,905)
Repurchase of treasury stock (average cost of $12.24 per share)
(8,714)(107)(107)
Issuance of stock for VSB Bancorp, Inc. acquisition3,862,746 39 41,408 41,447 
Balance at September 30, 202053,124,898 $648 $590,316 $(18,993)$330,602 $14,407 $(159,582)$757,398 




See accompanying notes to unaudited consolidated financial statements.
8

NORTHFIELD BANCORP, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS
(Unaudited) (In thousands)
Nine Months Ended September 30,
 20202019
Net income$23,926 $30,114 
Adjustments to reconcile net income to net cash provided by operating activities:  
Provision (credit) for loan losses10,269 (750)
ESOP and stock compensation expense2,301 4,244 
Depreciation2,603 2,316 
Amortization of premiums, and deferred loan costs, net of (accretion) of discounts, and deferred loan fees3,450 3,118 
Amortization of intangible assets165 201 
Amortization of operating lease right-of-use assets3,665 3,345 
Income on bank owned life insurance(2,635)(5,071)
Net gain on sale of loans held-for-sale(665)— 
Proceeds from sale of loans held-for-sale48,165 — 
Origination of loans held-for-sale(47,500)— 
Gains on available-for-sale debt securities, net(105)(337)
Gains on trading securities, net(397)(1,457)
Net sales of trading securities626 50 
Decrease (increase) in accrued interest receivable1,963 (859)
(Increase) decrease in other assets(6,632)1,633 
Decrease in accrued expenses and other liabilities(9,117)(2,630)
Net cash provided by operating activities30,082 33,917 
Cash flows from investing activities:  
Net increase in loans receivable(114,884)(64,950)
Purchases of loans— (44,918)
Purchases of Federal Home Loan Bank of New York stock(10,497)(25,901)
Redemptions of Federal Home Loan Bank of New York stock20,610 16,313 
Purchases of debt securities available-for-sale (302,378)(456,535)
Purchases of equity securities(4,276)(1,008)
Principal payments and maturities on debt securities available-for-sale 389,799 168,931 
Principal payments and maturities on debt securities held-to-maturity627 658 
Proceeds from sale of debt securities available-for-sale 17,121 54,438 
Proceeds from sale of equity securities3,115 — 
Proceeds from bank owned life insurance 2,716 5,002 
Purchases and improvements of premises and equipment(1,576)(2,678)
Net cash acquired in business combination72,875 — 
Net cash provided by (used in) investing activities73,252 (350,648)
Cash flows from financing activities:  
Net increase in deposits358,339 50,797 
Dividends paid(15,905)(15,066)
Exercise of stock options175 5,575 
Purchase of treasury stock
(107)(15,699)
(Decrease) increase in advance payments by borrowers for taxes and insurance(2,716)744 
Repayments under capital lease obligations— (44)
Proceeds from securities sold under agreements to repurchase and other borrowings370,901 685,816 
Repayments related to securities sold under agreements to repurchase and other borrowings(611,000)(403,502)
Net cash provided by financing activities99,687 308,621 
Net (increase) decrease in cash and cash equivalents203,021 (8,110)
Cash and cash equivalents at beginning of period147,818 77,762 
Cash and cash equivalents at end of period$350,839 $69,652 
9

NORTHFIELD BANCORP, INC.
CONSOLIDATED STATEMENTS OF CASH FLOWS - (Continued)
(Unaudited) (In thousands)
Nine Months Ended September 30,
20202019
Supplemental cash flow information:  
Cash paid during the period for:  
Interest$33,468 $39,588 
Income taxes11,910 6,973 
Non-cash transactions:  
Loan charge-offs (recoveries), net260 (1,319)
Initial recognition of operating lease right-of use assets— 43,560 
Initial recognition of operating lease liabilities— 47,328 
Right-of-use assets obtained in exchange for new lease liabilities3,028 1,013 
Transfer of originated loans held-for-investment to loans held-for-sale at fair value47,500 — 
Acquisition:
Non-cash assets acquired, at fair value:
Debt securities available for sale$126,931 — 
Loans180,431 — 
Accrued interest receivable1,415 — 
Bank-owned life insurance5,714 — 
Premises and equipment7,789 — 
Goodwill3,183 — 
Other assets4,702 — 
Total non-cash assets acquired330,165 — 
Non-cash liabilities assumed at fair value:
Deposits354,592 — 
Other liabilities7,001 — 
Total non-cash liabilities assumed361,593 — 
Net non-cash liabilities assumed(31,428)— 
Net cash and cash equivalents acquired72,875 — 
Common stock issued in acquisition$41,447 — 





















See accompanying notes to unaudited consolidated financial statements.

10
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements
Note 1 – Consolidated Financial Statements
Basis of Presentation

The consolidated financial statements are comprised of the accounts of Northfield Bancorp, Inc. (and its wholly owned subsidiaries, Northfield Investments, Inc. and Northfield Bank (the “Bank”), and the Bank’s wholly-owned subsidiaries, NSB Services Corp. and NSB Realty Trust, collectively the “Company”). All significant intercompany accounts and transactions have been eliminated in consolidation.
 
In the opinion of management, all adjustments (consisting solely of normal and recurring adjustments) necessary for the fair presentation of the consolidated balance sheets and the consolidated statements of comprehensive income for the unaudited periods presented have been included. The results of operations and other data presented for the three and nine months ended September 30, 2020 are not necessarily indicative of the results of operations that may be expected for the year ending December 31, 2020 or for any other period. Whenever necessary, certain prior year amounts are reclassified to conform to the current year presentation.
    In preparing the unaudited consolidated financial statements in conformity with U.S. generally accepted accounting principles (“U.S. GAAP”), management has made estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheets and the consolidated statements of comprehensive income for the periods indicated. Material estimates that are particularly susceptible to change are: the allowance for loan losses, estimated cash flows of our purchased credit-impaired (“PCI”) loans and the valuation allowance against deferred tax assets. Estimates and assumptions are reviewed periodically and the effects of revisions are reflected in the consolidated financial statements in the period they are deemed necessary. While management uses its best judgment, actual amounts or results could differ significantly from those estimates.
 
Certain information and note disclosures usually included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for the preparation of interim financial statements. The consolidated financial statements presented should be read in conjunction with the audited consolidated financial statements and notes to consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2019, as filed with the SEC. 

COVID-19

    On March 13, 2020, the Coronavirus Disease (COVID-19) pandemic was declared a national emergency by the President of the United States. The spread of COVID-19 has negatively impacted the national and local economy, disrupted supply chains and increased unemployment levels. The initial temporary closure and gradual reopening of many businesses and the implementation of social distancing and stay-at-home policies has and will continue to impact many of the Company’s customers. The Company is committed to supporting its customers, employees and communities during this difficult time and has adapted to the changing environment. The Company has implemented temporary relief assistance to customers, including the consideration of various loan payment deferral and fee waiver options. The bank branches are currently fully open with additional health, social distancing, and limited capacity measures put in place to meet safety requirements. We continue to provide secure and efficient remote work options for our back office employees.

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act was signed into law. It contains substantial tax and spending provisions intended to address the impact of the COVID-19 pandemic. The CARES Act includes a range of other provisions designed to support the U.S. economy and mitigate the impact of COVID-19 on financial institutions and their customers, including through the authorization of various relief programs and measures that the U.S. Department of the Treasury, the Small Business Administration, the Federal Reserve Board (“FRB”) and other federal banking agencies have implemented or may implement.

11
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
    Under the CARES Act, financial institutions are permitted to delay the adoption of the Financial Accounting Standards Board's (“FASB”) Accounting Standard Update (“ASU”) No. 2016-13, Financial Instruments - Credit Losses (Topic 326) (“CECL”) until the earlier of the termination date of the national emergency declaration or December 31, 2020. The Company has elected to defer the adoption of CECL, with an effective retrospective implementation date of January 1, 2020.

    The CARES Act also includes a provision that permits a financial institution to elect to suspend temporarily troubled debt restructuring (“TDR”) accounting under ASC Subtopic 310-40. To be eligible, a loan modification must be: (1) related to COVID-19; (2) executed on a loan that was not more than 30 days past due as of December 31, 2019; and (3) executed between March 1, 2020, and the earlier of (a) 60 days after the date of termination of the national emergency or (b) December 31, 2020. This includes short-term (e.g., up to six months) modifications such as payment deferrals, fee waivers, extensions of repayment terms, or delays in payment that are insignificant. Borrowers considered current are those that are less than 30 days past due on their contractual payments at the time a modification program is implemented. The banking regulators issued similar guidance, which also clarified that a COVID-19-related modification should not be considered a TDR if the borrower was current on payments at the time the underlying loan modification program was implemented and if the modification is considered to be short-term. The Company implemented a short-term loan modification program in late March 2020 to provide temporary payment relief to borrowers impacted by COVID-19. The program allows for a deferral of payments typically for 90 days, which may be extended for an additional 90 days, for a maximum of 180 days on a cumulative basis. See Note 6 - Loans for additional details of the Company's loan modification program.

A provision in the CARES Act provides for a loan guarantee program called the Paycheck Protection Program (“PPP”), which provides 100% federally guaranteed loans for small businesses to cover payroll, utilities, rent and interest. These small business loans are fully guaranteed by the Small Business Administration (“SBA”) and may be forgiven if borrowers maintain their payrolls and satisfy certain other conditions for a period of time during the COVID-19 pandemic. As of September 30, 2020, the Company had originated over 1,000 PPP loans to new and existing customers, totaling approximately $118.5 million, with an additional 395 PPP loans totaling approximately $30.0 million acquired as part of our acquisition of VSB Bancorp, Inc. on July 1, 2020. PPP provides for lender processing fees that range from 1% to 5% of the final disbursement made to individual borrowers. As of September 30, 2020, we have received loan processing fees of $5.3 million, of which $818,000 has been recognized in earnings through September 30, 2020, and the remainder will be recognized in earnings over the remaining life of the loans. PPP loans are fully guaranteed by the SBA and are therefore excluded from the allowance for loan and lease losses calculation.

The Company continues to maintain a strong liquidity and capital position as a buffer to protect against the economic uncertainties presented by the COVID-19 pandemic. As of September 30, 2020, both the Company and the Bank's capital ratios were in excess of regulatory requirements and are both currently classified as well capitalized. The Company maintains access to multiple sources of liquidity and expects to have sufficient funds available to meet current commitments in the normal course of business.

    While the Company has not incurred any significant disruption to its business activities as a result of COVID-19, the full impact of the pandemic is unknown and rapidly evolving. The outbreak is having a significant adverse impact on certain industries the Company serves, including retail, accommodations, and restaurants and food services. While most states have re-opened, it is under limited capacities and under other social-distancing restrictions, which has resulted in lower commercial activity and consumer spending. This decrease in commercial activity may result in our customers' inability to meet their loan obligations to us. In addition, the economic pressures and uncertainties related to the COVID-19 pandemic have resulted in changes in consumer spending behaviors, which may negatively impact the demand for loans and other services we offer. Because of the significant uncertainties related to the ultimate duration of the COVID-19 pandemic and its effects on our customers and prospects, and on the local and national economy, there can be no assurances as to how the crisis may ultimately affect the Company's loan portfolio, and business as a whole. The extent of such impact will depend on future developments, which are highly uncertain, including when the coronavirus can be controlled and abated and whether the gradual reopening of businesses will result in a meaningful increase in economic activity. As such, the Company could be subject to certain risks, any of which could have a material, adverse effect on our business, financial condition, liquidity, and results of operations.

12
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Note 2 – Business Combinations
    
On July 1, 2020, the Company completed its acquisition of VSB Bancorp, Inc. (“Victory”), parent company of Victory State Bank, in a stock transaction, which after purchase accounting adjustments added $403.0 million to total assets, including $180.4 million to loans, and $354.6 million to deposits, and six branch offices in Staten Island, New York. Under the terms of the merger agreement, each share of Victory common stock was exchanged for 2.0463 shares of Northfield common stock with fractional shares paid out in cash.

    The transaction was accounted for under the acquisition method of accounting. Under this method of accounting, the purchase price has been allocated to the respective assets acquired and liabilities assumed based upon their estimated fair values, net of tax, as of July 1, 2020, and results of operations have been included in the Company's consolidated statements of income from that date forward. The excess of consideration paid over the fair value of the net assets acquired has been recorded as goodwill.

Direct costs related to the acquisition were expensed as incurred. During the three and nine months ended September 30, 2020, the Company incurred $3.9 million and $4.3 million, respectively, of merger-related expenses, pre-tax, which are included in non-interest expense in the Company's consolidated statements of income.

    The following table summarizes the estimated fair values of the assets acquired and the liabilities assumed at the date of acquisition for Victory (in thousands):
At July 1, 2020
Fair Value
Total Purchase Price$41,447 
Assets acquired:
Cash and cash equivalents$72,875 
Debt securities available for sale126,931 
Loans180,431 
Accrued interest receivable1,415 
Bank-owned life insurance5,714 
Premises and equipment7,789 
Other assets4,702 
Total assets acquired399,857 
Liabilities assumed:
Deposits354,592 
Other liabilities7,001 
Total liabilities assumed361,593 
Net assets acquired$38,264 
Goodwill recorded in the merger$3,183 

    The calculation of goodwill is subject to change for up to one year after the date of acquisition as additional information that existed as of the acquisition date estimates and uncertainties become available. As the Company finalizes its review of the acquired assets and liabilities, certain adjustments to the recorded carrying values may be required.

Fair Value Measurement of Assets Assumed and Liabilities Assumed

    Described below are the methods used to determine the fair value of the significant assets acquired and liabilities assumed in the Victory acquisition.

Cash and cash equivalents. The estimated fair values of cash and cash equivalents approximate their stated face amounts, as these financial instruments are either due on demand or have short-term maturities.

Debt securities Available-for-Sale. The estimated fair values of the securities were calculated utilizing Level 2 inputs. Prices for the securities were obtained from an independent nationally recognized third-party pricing service.

Loans. The acquired loan portfolio was valued based on current guidance which defines fair value as the price that would be received to sell an asset or transfer a liability in an orderly transaction between market participants at the measurement date. Level 3 inputs were utilized to value the portfolio and included the use of present value techniques
13
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
employing cash flow estimates and the incorporated assumptions that marketplace participants would use in estimating fair values. In instances where reliable market information was not available, the Company used its own assumptions in an effort to determine reasonable fair value. Specifically, management utilized three separate fair value analyses which a market participant would employ in estimating the total fair value adjustment. The three separate fair valuation methodologies used were: 1) interest rate loan fair value analysis; 2) general credit fair value adjustment; and 3) specific credit fair value adjustment.

    To prepare the interest rate fair value analysis, loans were grouped by characteristics such as loan type, term, collateral and rate. Market rates for similar loans were obtained from various external data sources and reviewed by Company management for reasonableness. The average of these rates was used as the fair value interest rate a market participant would utilize. A present value approach was utilized to calculate the interest rate fair value adjustment.

    The general credit fair value adjustment was calculated using a two-part general credit fair value analysis: 1) expected credit losses; and 2) estimated fair value adjustment for qualitative factors. The expected credit losses were calculated using an average of historical losses of the acquired bank and industry bench mark loss rates observed for loans with similar underlying characteristics. The adjustment related to qualitative factors was impacted by general economic conditions and the risk related to lack of familiarity with the originator's underwriting process.

    To calculate the specific credit fair value adjustment, management reviewed the acquired loan portfolio for loans meeting the definition of an impaired loan with deteriorated credit quality. Loans meeting this definition were reviewed by comparing the contractual cash flows to expected collectible cash flows. The aggregate expected cash flows less the acquisition date fair value resulted in an accretable yield amount. The accretable yield amount will be recognized over the life of the loans on a level yield basis as an adjustment to yield.

The following is a summary of the credit impaired loans acquired in the Victory acquisition as of the closing date (in thousands):
July 01, 2020
Contractually required principal and interest$7,557 
Contractual cash flows not expected to be collected (non-accretable discount)3,213 
Expected cash flows to be collected at acquisition4,344 
Interest component of expected cash flows (accretable yield)(572)
Fair value of acquired loans$3,772 

Deposits. The fair values of deposit liabilities with no stated maturity (i.e., non-interest bearing demand accounts, interest-bearing negotiable orders of withdrawal (NOW), savings and money market accounts) are equal to the carrying amounts payable on demand. The fair values of certificates of deposit represent contractual cash flows, discounted to present value using interest rates currently offered on deposits with similar characteristics and remaining maturities.


14
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Note 3 – Debt Securities Available-for-Sale
The following is a comparative summary of mortgage-backed and other debt securities available-for-sale at September 30, 2020, and December 31, 2019 (in thousands):
 September 30, 2020
  GrossGrossEstimated
 Amortizedunrealizedunrealizedfair
 costgainslossesvalue
U.S. Government Agency Securities$3,168 $2 $— $3,170 
Mortgage-backed securities:
Pass-through certificates:    
Government sponsored enterprises (GSE)300,937 11,297 183 312,051 
Real estate mortgage investment conduits (REMICs):    
GSE746,540 7,685 270 753,955 
Non-GSE6 — — 6 
 1,047,483 18,982 453 1,066,012 
Other debt securities:    
Municipal bonds228 1 — 229 
Corporate bonds99,855 1,337 17 101,175 
Asset-backed securities834 10 — 844 
100,917 1,348 17 102,248 
Total debt securities available-for-sale$1,151,568 $20,332 $470 $1,171,430 
 December 31, 2019
  GrossGrossEstimated
 Amortizedunrealizedunrealizedfair
 costgainslossesvalue
Mortgage-backed securities:    
Pass-through certificates:    
GSE$324,080 $6,081 $754 $329,407 
REMICs:    
GSE643,816 2,076 2,225 643,667 
Non-GSE53 — — 53 
 967,949 8,157 2,979 973,127 
Other debt securities:
Municipal bonds296 3 — 299 
Corporate bonds163,725 1,214 13 164,926 
164,021 1,217 13 165,225 
Total debt securities available-for-sale$1,131,970 $9,374 $2,992 $1,138,352 
15
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
The following is a summary of the expected maturity distribution of debt securities available-for-sale, other than mortgage-backed securities, at September 30, 2020 (in thousands):
Available-for-saleAmortized costEstimated fair value
Due in one year or less$37,140 $37,313 
Due after one year through five years62,943 64,091 
Due after five years through ten years3,168 3,170 
Due after ten years834 844 
 $104,085 $105,418 
 Contractual maturities for mortgage-backed securities are not included above, as expected maturities on mortgage-backed securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties.

    Certain debt securities available-for-sale are pledged or encumbered to secure borrowings under Pledge Agreements and Repurchase Agreements and for other purposes required by law. At September 30, 2020, the fair value of debt securities available-for-sale that were pledged to secure borrowings and deposits was $537.0 million.

    For the three months ended September 30, 2020, the Company had gross proceeds of $4.5 million on sales and calls of debt securities available-for-sale, with gross realized gains of $48,000 related to sales of securities and gross realized losses of $3,000 related to calls of securities. For the nine months ended September 30, 2020, the Company had gross proceeds of $17.1 million on sales and calls of debt securities available-for-sale, with gross realized gains of $122,000 related to sales of securities and gross realized losses of $17,000 related to calls of securities. For the three and nine months ended September 30, 2019, the Company had gross proceeds of $20.0 million and $54.4 million, respectively, on sales of debt securities available-for-sale, with gross realized gains of $123,000 and $337,000, respectively, and no gross realized losses. The Company recognized net gains of $763,000 and $397,000 on its trading securities portfolio during the three and nine months ended September 30, 2020, respectively, and net gains of $28,000 and $1.5 million, during the three and nine months ended September 30, 2019, respectively.

16
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Gross unrealized losses on mortgage-backed and other debt securities available-for-sale, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2020, and December 31, 2019, were as follows (in thousands):
 September 30, 2020
 Less than 12 months12 months or moreTotal
 UnrealizedEstimatedUnrealizedEstimatedUnrealizedEstimated
 lossesfair valuelossesfair valuelossesfair value
Mortgage-backed securities:
Pass-through certificates:      
GSE$172 $33,945 $11 $428 $183 $34,373 
REMICs:      
GSE268 79,194 2 2,326 270 81,520 
Other debt securities:      
Corporate bonds17 4,267 — — 17 4,267 
Total$457 $117,406 $13 $2,754 $470 $120,160 
 December 31, 2019
 Less than 12 months12 months or moreTotal
 UnrealizedEstimatedUnrealizedEstimatedUnrealizedEstimated
 lossesfair valuelossesfair valuelossesfair value
Mortgage-backed securities:      
Pass-through certificates:      
GSE$25 $3,404 $729 $55,184 $754 $58,588 
REMICs:      
GSE950 197,634 1,275 54,555 2,225 252,189 
Non-GSE— — — 53 — 53 
Other debt securities:
Corporate bonds— — 13 15,586 13 15,586 
Total$975 $201,038 $2,017 $125,378 $2,992 $326,416 
 
The Company held 11 pass-through mortgage-backed securities issued or guaranteed by GSEs and one REMIC mortgage-backed security issued or guaranteed by GSEs that were in a continuous unrealized loss position of twelve months or greater at September 30, 2020. There were 19 pass-through mortgage-backed securities issued or guaranteed by GSEs, 57 REMIC mortgage-backed securities issued or guaranteed by GSEs, and one corporate bond that were in an unrealized loss position of less than twelve months at September 30, 2020. All securities referred to above were rated investment grade at September 30, 2020. Management evaluated these securities and concluded that the declines in fair value relate to the general interest rate environment and are considered temporary. The securities cannot be prepaid in a manner that would result in the Company not receiving substantially all of its amortized cost. The Company neither has an intent to sell, nor is it more likely than not that the Company will be required to sell, the securities before the recovery of their amortized cost basis or, if necessary, maturity.
 
The fair values of our debt securities available-for-sale could decline in the future if the underlying performance of the collateral for the collateralized mortgage obligations or other securities deteriorates and our credit enhancement levels do not provide sufficient protections to our contractual principal and interest, which may result in other-than-temporary impairment in the future. The Company did not recognize any other-than-temporary impairment charges during the three and nine months ended September 30, 2020, or September 30, 2019.     
17
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)

Note 4 – Debt Securities Held-to-Maturity
    The following is a summary of debt securities held-to-maturity at September 30, 2020, and December 31, 2019 (in thousands): 
 September 30, 2020
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Mortgage-backed securities:    
Pass-through certificates:    
GSEs$8,106 $369 $— $8,475 
Total securities held-to-maturity$8,106 $369 $— $8,475 
 December 31, 2019
 Amortized CostGross Unrealized GainsGross Unrealized LossesEstimated Fair Value
Mortgage-backed securities:    
Pass-through certificates:    
GSEs$8,762 $129 $5 $8,886 
Total securities held-to-maturity$8,762 $129 $5 $8,886 
    
    Contractual maturities for mortgage-backed securities are not presented, as expected maturities on mortgage-backed securities may differ from contractual maturities as borrowers may have the right to call or prepay obligations with or without penalties. There were no sales of held-to-maturity securities for the nine months ended September 30, 2020, or September 30, 2019.

    At September 30, 2020, debt securities held-to-maturity with a carrying value of $6.8 million were pledged to secure borrowings and deposits.

    At September 30, 2020, there were no debt securities held-to-maturity in an unrealized loss position.

    Gross unrealized losses on mortgage-backed securities held-to-maturity, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2019, were as follows (in thousands):
 December 31, 2019
 Less than 12 months12 months or moreTotal
 Unrealized lossesEstimated fair valueUnrealized lossesEstimated fair valueUnrealized lossesEstimated fair value
Mortgage-backed securities:
Pass-through certificates:  
GSEs$— $— $5 $378 $5 $378 
Total securities held-to-maturity$— $— $5 $378 $5 $378 
    
    The fair values of our debt securities held-to-maturity could decline in the future if the underlying performance of the collateral for the collateralized mortgage obligations or other securities deteriorates and our credit enhancement levels do not provide sufficient protections to our contractual principal and interest. As a result, there is a risk that significant other-than-temporary impairments may occur in the future given the current economic environment. The Company did not recognize any other-than-temporary impairment charges in earnings on securities held-to-maturity during the three and nine months ended September 30, 2020, or September 30, 2019.
18
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)

Note 5 – Equity Securities
    At September 30, 2020, and December 31, 2019, equity securities totaled $4.5 million and $3.3 million, respectively. Equity securities consist of money market mutual funds recorded at fair value of $4.5 million and $250,000 at September 30, 2020, and December 31, 2019, respectively, and in addition, an investment in a private SBA Loan Fund recorded at net asset value of $3.1 million at December 31, 2019. As the SBA Fund operates as a private fund, its shares are not publicly traded and therefore have no readily determinable market value. The investment fund was recorded at net asset value as a practical expedient for reporting fair value. The Company redeemed its remaining investment in the fund during the quarter ended September 30, 2020.

Note 6 – Loans
 
Net loans held-for-investment are as follows (in thousands):
 September 30,December 31,
 20202019
Real estate loans: 
Multifamily$2,285,074 $2,196,407 
Commercial mortgage545,826 528,681 
One-to-four family residential mortgage74,912 83,742 
Home equity and lines of credit86,855 84,928 
Construction and land55,069 38,284 
Total real estate loans3,047,736 2,932,042 
Commercial and industrial loans (1)
162,530 45,328 
Other loans1,770 2,083 
Total commercial and industrial and other loans164,300 47,411 
Deferred loan cost, net3,473 7,614 
Originated loans held-for-investment, net3,215,509 2,987,067 
PCI Loans18,468 17,365 
Loans acquired:  
One-to-four family residential mortgage146,218 187,975 
Multifamily90,927 108,417 
Commercial mortgage175,522 113,027 
Home equity and lines of credit9,690 12,008 
Construction and land23,843 2,537 
Total acquired real estate loans446,200 423,964 
Commercial and industrial loans (1)
51,117 8,689 
Other loans323 — 
Total loans acquired, net497,640 432,653 
Loans held-for-investment, net3,731,617 3,437,085 
Allowance for loan losses(38,716)(28,707)
Net loans held-for-investment$3,692,901 $3,408,378 
(1) Included in originated and acquired commercial and industrial loans at September 30, 2020, are PPP loans totaling $115.2 million and $30.0 million, respectively. There were no PPP loans at December 31, 2019.

    There were no loans held-for-sale at September 30, 2020, or December 31, 2019.

PCI loans totaled $18.5 million at September 30, 2020, as compared to $17.4 million at December 31, 2019. The majority of the PCI loan balance was attributable to those loans acquired as part of a Federal Deposit Insurance Corporation-assisted transaction. The Company accounts for PCI loans utilizing U.S. GAAP applicable to loans acquired with deteriorated credit quality. At September 30, 2020, PCI loans consisted of approximately 23% commercial real estate loans and 41% commercial and industrial loans, with the remaining balance in residential and home equity loans. At December 31, 2019, PCI loans consisted of approximately 29% commercial real estate loans and 42% commercial and industrial loans, with the remaining balance in residential and home equity loans.

19
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
The following table details the accretion of interest income for PCI loans for the three and nine months ended September 30, 2020 and September 30, 2019 (in thousands): 
 At or for the three months ended September 30,At or for the nine months ended September 30,
 2020201920202019
Balance at the beginning of period$15,566 $19,794 $17,086 $21,846 
Acquisition572 — 572 — 
Accretion into interest income(648)(1,059)(2,168)(3,111)
Balance at end of period$15,490 $18,735 $15,490 $18,735 
20
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
The following tables set forth activity in our allowance for loan losses, by loan type, as of and for the three and nine months ended September 30, 2020, and September 30, 2019 (in thousands):  
 Three Months Ended September 30, 2020
 Real Estate     
 CommercialOne-to-Four FamilyConstruction and LandMultifamilyHome Equity and Lines of CreditCommercial and IndustrialOtherOriginated Loans TotalPurchased Credit-ImpairedAcquired LoansTotal
Allowance for loan losses:          
Beginning balance$6,509 $272 $937 $27,243 $558 $1,846 $176 $37,541 $789 $190 $38,520 
Charge-offs(7)— — — — — — (7)— (5)(12)
Recoveries13 — — — 26 1 — 40 — 3 43 
Provisions (credit)892 (50)198 (596)(157)(73)(47)167 — (2)165 
Ending balance$7,407 $222 $1,135 $26,647 $427 $1,774 $129 $37,741 $789 $186 $38,716 
 Three Months Ended September 30, 2019
 Real Estate     
 CommercialOne-to-Four FamilyConstruction and LandMultifamilyHome Equity and Lines of CreditCommercial and IndustrialOtherOriginated Loans Total Purchased Credit-ImpairedAcquired LoansTotal
Allowance for loan losses:          
Beginning balance$5,331 $234 $584 $18,384 $417 $1,591 $146 $26,687 $1,010 $135 $27,832 
Charge-offs(514)— — — — — — (514)— — (514)
Recoveries60 — — 1,818 — 17 — 1,895 — 153 2,048 
Provisions (credit)(8)(17)(192)(799)(103)(9)(19)(1,147)— (153)(1,300)
Ending balance$4,869 $217 $392 $19,403 $314 $1,599 $127 $26,921 $1,010 $135 $28,066 





21
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 Nine Months Ended September 30, 2020
 Real Estate     
 CommercialOne-to-Four FamilyConstruction and LandMultifamilyHome Equity and Lines of CreditCommercial and IndustrialOtherOriginated Loans TotalPurchased Credit-ImpairedAcquired LoansTotal
Allowance for loan losses:          
Beginning balance$4,756 $180 $536 $20,203 $317 $1,640 $151 $27,783 $789 $135 $28,707 
Charge-offs(171)— — — — (94)— (265)— (438)(703)
Recoveries396 26 — — — 6 — 428 — 15 443 
Provisions (credit)2,426 16 599 6,444 110 222 (22)9,795 — 474 10,269 
Ending balance$7,407 $222 $1,135 $26,647 $427 $1,774 $129 $37,741 $789 $186 $38,716 
 Nine Months Ended September 30, 2019
 Real Estate     
 CommercialOne-to-Four FamilyConstruction and LandMultifamilyHome Equity and Lines of CreditCommercial and IndustrialOtherOriginated Loans TotalPurchased Credit-ImpairedAcquired LoansTotal
Allowance for loan losses:          
Beginning balance$5,630 $342 $463 $18,084 $291 $1,569 $108 $26,487 $1,010 $— $27,497 
Charge-offs(520)— — — — (83)(123)(726)— (112)(838)
Recoveries85 72 — 1,818 — 17 1 1,993 — 164 2,157 
Provisions (credit)(326)(197)(71)(499)23 96 141 (833)— 83 (750)
Ending balance$4,869 $217 $392 $19,403 $314 $1,599 $127 $26,921 $1,010 $135 $28,066 

    
22
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
    The following tables detail the amount of loans receivable held-for-investment, net of deferred loan fees and costs, that are evaluated individually, and collectively, for impairment, and the related portion of the allowance for loan losses that is allocated to each loan portfolio segment, at September 30, 2020, and December 31, 2019 (in thousands):
 September 30, 2020
 Real Estate     
 CommercialOne-to-Four FamilyConstruction and LandMultifamilyHome Equity and Lines of CreditCommercial and IndustrialOtherOriginated Loans TotalPurchased Credit-ImpairedAcquired LoansTotal
Allowance for loan losses:
Ending balance: individually evaluated for impairment$116 $— $— $— $3 $3 $— $122 $— $186 $308 
Ending balance: collectively evaluated for impairment$7,291 $222 $1,135 $26,647 $424 $1,771 $129 $37,619 $789 $— $38,408 
Loans, net:          
Ending balance$546,421 $76,361 $55,098 $2,288,402 $88,859 $158,598 $1,770 $3,215,509 $18,468 $497,640 $3,731,617 
Ending balance: individually evaluated for impairment$11,523 $1,423 $— $629 $49 $54 $— $13,678 $— $5,810 $19,488 
PPP loans not evaluated for impairment (1)
$— $— $— $— $— $115,157 $— $115,157 $— $29,995 $145,152 
Ending balance: collectively evaluated for impairment$534,898 $74,938 $55,098 $2,287,773 $88,810 $43,387 $1,770 $3,086,674 $18,468 $461,835 $3,566,977 
(1) PPP loans are guaranteed by the SBA and therefore excluded from the allowance for loan losses

 December 31, 2019
 Real Estate     
 CommercialOne-to-Four FamilyConstruction and LandMultifamilyHome Equity and Lines of CreditCommercial and IndustrialOtherOriginated Loans TotalPurchased Credit-ImpairedAcquired LoansTotal
Allowance for loan losses:
Ending balance: individually evaluated for impairment$— $— $— $— $3 $4 $— $7 $— $135 $142 
Ending balance: collectively evaluated for impairment$4,756 $180 $536 $20,203 $314 $1,636 $151 $27,776 $789 $— $28,565 
Loans, net:          
Ending balance$529,287 $85,355 $38,303 $2,199,734 $86,848 $45,456 $2,084 $2,987,067 $17,365 $432,653 $3,437,085 
Ending balance: individually evaluated for impairment$13,226 $1,841 $— $997 $55 $58 $— $16,177 $— $4,780 $20,957 
Ending balance: collectively evaluated for impairment$516,061 $83,514 $38,303 $2,198,737 $86,793 $45,398 $2,084 $2,970,890 $17,365 $427,873 $3,416,128 
23
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
    The Company monitors the credit quality of its loan portfolio on a regular basis. Credit quality is monitored by reviewing certain credit quality indicators. Management has determined that loan-to-value ratios (at period end) and internally assigned credit risk ratings by loan type are the key credit quality indicators that best measure the credit quality of the Company’s loan receivables. Loan-to-value (“LTV”) ratios used by management in monitoring credit quality are based on current period loan balances and original appraised values at the time of origination (unless a current appraisal has been obtained as a result of the loan being deemed impaired). In calculating the provision for loan losses, based on past loan loss experience, management has determined that commercial real estate loans and multifamily loans having loan-to-value ratios, as described above, of less than 35%, and one-to-four family loans having loan-to-value ratios, as calculated above, of less than 60%, require less of a loss factor than those with higher loan to value ratios.
 
    The Company maintains a credit risk rating system as part of the risk assessment of its loan portfolio. The Company’s lending officers are required to assign a credit risk rating to each loan in their portfolio at origination. This risk rating is reviewed periodically and adjusted if necessary. Monthly, management presents monitored assets to the loan committee. In addition, the Company engages a third-party independent loan reviewer that performs semi-annual reviews of a sample of loans, validating the credit risk ratings assigned to such loans. The credit risk ratings play an important role in the establishment of the provision for loan losses and the allowance for loan losses for originated loans held-for-investment. After determining the loss factor for each originated portfolio segment held-for-investment, the collectively evaluated for impairment balance of the held-for-investment portfolio is multiplied by the collectively evaluated for impairment loss factor for the respective portfolio segment in order to determine the allowance for loans collectively evaluated for impairment.

    When assigning a risk rating to a loan, management utilizes the Bank’s internal nine-point credit risk rating system. 

1.Strong
2.Good
3.Acceptable
4.Adequate
5.Watch
6.Special Mention
7.Substandard
8.Doubtful
9.Loss
 
    Loans rated 1 to 5 are considered pass ratings. An asset is classified substandard if it is inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Substandard assets have well defined weaknesses based on objective evidence, and are characterized by the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Assets classified as doubtful have all of the weaknesses inherent in those classified substandard with the added characteristic that the weaknesses present make collection or liquidation in full highly questionable and improbable based on current circumstances. Assets classified as loss are those considered uncollectible and of such little value that their continuance as assets is not warranted. Assets which do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses, are required to be designated special mention.
24
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
The following tables detail the recorded investment of originated loans held-for-investment, net of deferred fees and costs, by loan type and credit quality indicator at September 30, 2020, and December 31, 2019 (in thousands):
 At September 30, 2020
 Real Estate   
 MultifamilyCommercialOne-to-Four FamilyConstruction and LandHome Equity and Lines of CreditCommercial and IndustrialOtherTotal
 < 35% LTV=> 35% LTV< 35% LTV=> 35% LTV< 60% LTV=> 60% LTV     
Internal Risk Rating           
Pass$247,764 $2,031,541 $88,443 $428,828 $52,496 $21,528 $55,098 $88,507 $157,856 $1,770 $3,173,831 
Special Mention— 756 77 5,104 605 — — 71 631 — 7,244 
Substandard579 7,762 4,470 19,499 1,709 23 — 281 111 — 34,434 
Originated loans held-for-investment, net$248,343 $2,040,059 $92,990 $453,431 $54,810 $21,551 $55,098 $88,859 $158,598 $1,770 $3,215,509 

 At December 31, 2019
 Real Estate   
 MultifamilyCommercialOne-to-Four FamilyConstruction and LandHome Equity and Lines of CreditCommercial and IndustrialOtherTotal
 < 35% LTV=> 35% LTV< 35% LTV=> 35% LTV< 60% LTV=> 60% LTV     
Internal Risk Rating           
Pass$232,950 $1,960,984 $79,485 $440,065 $52,886 $29,967 $38,303 $86,547 $45,075 $2,084 $2,968,346 
Special Mention— 296 370 1,092 777 — — 14 301 — 2,850 
Substandard301 5,203 — 8,275 1,397 328 — 287 80 — 15,871 
Originated loans held-for-investment, net$233,251 $1,966,483 $79,855 $449,432 $55,060 $30,295 $38,303 $86,848 $45,456 $2,084 $2,987,067 
25
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Included in loans receivable are loans for which the accrual of interest income has been discontinued due to deterioration in the financial condition of the borrowers. The recorded investment of these non-accrual loans was $8.9 million and $9.4 million at September 30, 2020, and December 31, 2019, respectively. Generally, loans are placed on non-accrual status when they become 90 days or more delinquent, or sooner if considered appropriate by management, and remain on non-accrual status until they are brought current, have six consecutive months of performance under the loan terms, and factors indicating reasonable doubt about the timely collection of payments no longer exist. Therefore, loans may be current in accordance with their loan terms, or may be less than 90 days delinquent and still be on a non-accruing status.    

The non-accrual amounts included loans deemed to be impaired of $6.5 million and $6.8 million at September 30, 2020, and December 31, 2019, respectively. Loans on non-accrual status with principal balances less than $500,000, and therefore not meeting the Company’s definition of an impaired loan, amounted to $2.3 million at September 30, 2020, and $2.6 million at December 31, 2019. There were no non-accrual loans held-for-sale at both September 30, 2020, and December 31, 2019. Loans past due 90 days or more and still accruing interest were $2.1 million at September 30, 2020, and $518,000 at December 31, 2019, and consisted of loans that are considered well-secured and in the process of collection.
26
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
    The following tables set forth the detail, and delinquency status, of non-performing loans (non-accrual loans and loans past due 90 days or more and still accruing), net of deferred fees and costs, at September 30, 2020, and December 31, 2019, excluding PCI loans which have been segregated into pools. For PCI loans, each loan pool is accounted for as a single asset with a single composite interest rate and an aggregate expectation of cash flows (in thousands):
27
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 September 30, 2020
 Total Non-Performing Loans
 Non-Accruing Loans  
 0-29 Days Past Due30-89 Days Past Due90 Days or More Past DueTotal90 Days or More Past Due and AccruingTotal Non-Performing Loans
Loans held-for-investment:      
Real estate loans:      
Commercial      
LTV => 35%      
Substandard$— $— $937 $937 — $937 
Total commercial— — 937 937 — 937 
One-to-four family residential      
LTV < 60%      
Substandard398 — 77 475 398 873 
Total398 — 77 475 398 873 
LTV => 60%      
Substandard23 — — 23 — 23 
Total one-to-four family residential421 — 77 498 398 896 
Multifamily      
LTV < 35%
Substandard— 288 — 288 — 288 
LTV => 35%      
Substandard1 — — 1 485 486 
Total multifamily1 288 — 289 485 774 
Home equity and lines of credit      
Substandard61 89 — 150 — 150 
Total home equity and lines of credit61 89 — 150 — 150 
Total non-performing loans held-for-investment, originated483 377 1,014 1,874 883 2,757 
Loans acquired:      
Real estate loans:
Commercial      
LTV < 35%      
Pass— — — — 267 267 
Substandard— 79 187 266 — 266 
LTV => 35%
Substandard2,762 568 2,520 5,850 134 5,984 
Total commercial2,762 647 2,707 6,116 401 6,517 
One-to-four family residential      
LTV < 60%      
Pass— — — — 536 536 
Special Mention— — — — 220 220 
Substandard— — 328 328 6 334 
LTV => 60%      
Substandard— — 93 93 — 93 
Total one-to-four family residential— — 421 421 762 1,183 
Multifamily
LTV < 35%
Substandard39 — — 39 — 39 
LTV => 35%
Substandard— — 389 389 — 389 
Total multifamily39 — 389 428 — 428 
Home equity and lines of credit - Substandard— — 28 28 14 42 
Total home equity and lines of credit— — 28 28 14 42 
Commercial and industrial loans      
Substandard— — — — 3 3 
Total commercial and industrial loans— — — — 3 3 
Total non-performing loans acquired2,801 647 3,545 6,993 1,180 8,173 
Total non-performing loans$3,284 $1,024 $4,559 $8,867 $2,063 $10,930 
28
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 December 31, 2019
 Total Non-Performing Loans
 Non-Accruing Loans  
 0-29 Days Past Due30-89 Days Past Due90 Days or More Past DueTotal90 Days or More Past Due and AccruingTotal Non-Performing Loans
Loans held-for-investment:      
Real estate loans:      
Commercial      
LTV < 35%      
Substandard$— $— $2,416 $2,416 $— $2,416 
Total commercial— — 2,416 2,416 — 2,416 
One-to-four family residential      
LTV < 60%      
Substandard— — 493 493 114 607 
LTV => 60%      
Substandard— 29 — 29 — 29 
Total one-to-four family residential— 29 493 522 114 636 
Home equity and lines of credit
Substandard— 67 89 156 — 156 
Total home equity and lines of credit— 67 89 156 — 156 
Total non-performing loans held-for-investment, originated— 96 2,998 3,094 114 3,208 
Loans acquired:      
Real estate loans:
Commercial
LTV < 35%
Substandard79 — 188 267 66 333 
LTV => 35%
Substandard3,530 — 1,709 5,239 187 5,426 
Total commercial3,609 — 1,897 5,506 253 5,759 
One-to-four family residential
LTV < 60%      
Substandard190 — 85 275 151 426 
LTV => 60%
Substandard— — 93 93 — 93 
Total one-to-four family residential190 — 178 368 151 519 
Multifamily      
LTV < 35%
Substandard40 — — 40 — 40 
LTV => 35%      
Substandard— 397 — 397 — 397 
Total multifamily40 397 — 437 — 437 
Home equity and lines of credit
Substandard— — 28 28 — 28 
Total home equity and lines of credit— — 28 28 — 28 
Total non-performing loans acquired3,839 397 2,103 6,339 404 6,743 
Total non-performing loans$3,839 $493 $5,101 $9,433 $518 $9,951 
29
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
The following tables set forth the detail and delinquency status of originated and acquired loans held-for-investment, net of deferred fees and costs, by performing and non-performing loans at September 30, 2020, and December 31, 2019 (in thousands):
 September 30, 2020
 Performing (Accruing) Loans  
 0-29 Days Past Due30-89 Days Past DueTotalNon-Performing LoansTotal Loans Receivable, net
Loans held-for-investment:     
Real estate loans:     
Commercial     
LTV < 35%     
Pass$88,443 $— $88,443 $— $88,443 
Special Mention— 77 77 — 77 
Substandard4,470 — 4,470 — 4,470 
Total92,913 77 92,990 — 92,990 
LTV => 35%     
Pass428,828 — 428,828 — 428,828 
Special Mention4,587 517 5,104 — 5,104 
Substandard13,594 4,968 18,562 937 19,499 
Total447,009 5,485 452,494 937 453,431 
Total commercial539,922 5,562 545,484 937 546,421 
One-to-four family residential     
LTV < 60%     
Pass52,496 — 52,496 — 52,496 
Special Mention100 505 605 — 605 
Substandard836 — 836 873 1,709 
Total53,432 505 53,937 873 54,810 
LTV => 60%     
Pass21,528 — 21,528 — 21,528 
Substandard— — — 23 23 
Total21,528 — 21,528 23 21,551 
Total one-to-four family residential74,960 505 75,465 896 76,361 
Construction and land     
Pass55,098 — 55,098 — 55,098 
Total construction and land55,098 — 55,098 — 55,098 
Multifamily     
LTV < 35%     
Pass247,764 — 247,764 — 247,764 
Substandard291 — 291 288 579 
Total248,055 — 248,055 288 248,343 
LTV => 35%     
Pass2,031,542 — 2,031,542 — 2,031,542 
Special Mention465 291 756 — 756 
Substandard6,666 610 7,276 485 7,761 
Total2,038,673 901 2,039,574 485 2,040,059 
Total multifamily2,286,728 901 2,287,629 773 2,288,402 
Home equity and lines of credit     
Pass88,502 5 88,507 — 88,507 
Special Mention71 — 71 — 71 
Substandard131 — 131 150 281 
Total home equity and lines of credit88,704 5 88,709 150 88,859 
Commercial and industrial      
Pass157,540 316 157,856 — 157,856 
Special Mention231 400 631 — 631 
Substandard30 81 111 — 111 
Total commercial and industrial 157,801 797 158,598 — 158,598 
30
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 September 30, 2020
 Performing (Accruing) Loans (Continued)  
 0-29 Days Past Due30-89 Days Past DueTotalNon-Performing LoansTotal Loans Receivable, net
Other loans - Pass1,764 6 1,770 — 1,770 
Total originated loans held-for-investment3,204,977 7,776 3,212,753 2,756 3,215,509 
Acquired loans:
Real estate loans:
One-to-four family residential
LTV < 60%
Pass122,901 26 122,927 537 123,464 
Special Mention1,528 374 1,902 220 2,122 
Substandard— — — 333 333 
Total124,429 400 124,829 1,090 125,919 
LTV => 60%     
Pass20,206 — 20,206 — 20,206 
Substandard— — — 93 93 
Total20,206 — 20,206 93 20,299 
Total one-to-four family residential144,635 400 145,035 1,183 146,218 
Commercial     
LTV < 35%     
Pass52,941 500 53,441 267 53,708 
Special Mention5,076 — 5,076 — 5,076 
Substandard580 — 580 266 846 
Total58,597 500 59,097 533 59,630 
LTV => 35%
Pass95,981 936 96,917 — 96,917 
Special Mention7,776 — 7,776 — 7,776 
Substandard3,767 1,448 5,215 5,984 11,199 
Total107,524 2,384 109,908 5,984 115,892 
Total commercial166,121 2,884 169,005 6,517 175,522 
Construction and land     
Pass23,843 — 23,843 — 23,843 
Total construction and land23,843 — 23,843 — 23,843 
Multifamily     
LTV < 35%     
Pass86,948 — 86,948 — 86,948 
Substandard— — — 39 39 
Total86,948 — 86,948 39 86,987 
LTV => 35%     
Pass3,551 — 3,551 — 3,551 
Substandard— — — 389 389 
Total3,551 — 3,551 389 3,940 
Total multifamily90,499 — 90,499 428 90,927 
Home equity and lines of credit
Pass9,054 220 9,274 — 9,274 
Special Mention$46 $202 $248 $— $248 
Substandard125 — 125 43 168 
Total home equity and lines of credit9,225 422 9,647 43 9,690 
Commercial and industrial
Pass50,635 189 50,824 — 50,824 
Special Mention190 — 190 — 190 
Substandard66 37 103 — 103 
Total commercial and industrial 50,891 226 51,117 — 51,117 
Other loans - Pass315 4 319 4 323 
Total loans acquired485,529 3,936 489,465 8,175 497,640 
$3,690,506 $11,712 $3,702,218 $10,931 $3,713,149 
31
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 December 31, 2019
 Performing (Accruing) Loans  
 0-29 Days Past Due30-89 Days Past DueTotalNon-Performing LoansTotal Loans Receivable, net
Loans held-for-investment:     
Real estate loans:     
Commercial     
LTV < 35%     
Pass$79,383 $102 $79,485 — $79,485 
Special Mention370 — 370 — 370 
Total79,753 102 79,855 — 79,855 
LTV => 35%     
Pass439,253 812 440,065 — 440,065 
Special Mention1,092 — 1,092 — 1,092 
Substandard5,228 631 5,859 2,416 8,275 
Total445,573 1,443 447,016 2,416 449,432 
Total commercial525,326 1,545 526,871 2,416 529,287 
One-to-four family residential     
LTV < 60%     
Pass52,757 129 52,886 — 52,886 
Special Mention— 777 777 — 777 
Substandard790 — 790 607 1,397 
Total53,547 906 54,453 607 55,060 
LTV => 60%     
Pass29,741 226 29,967 — 29,967 
Substandard299 — 299 29 328 
Total30,040 226 30,266 29 30,295 
Total one-to-four family residential83,587 1,132 84,719 636 85,355 
Construction and land     
Pass38,156 147 38,303 — 38,303 
Total construction and land38,156 147 38,303 — 38,303 
Multifamily     
LTV < 35%     
Pass232,658 292 232,950 — 232,950 
Substandard301 — 301 — 301 
Total232,959 292 233,251 — 233,251 
LTV => 35%     
Pass1,960,729 255 1,960,984 — 1,960,984 
Special Mention296 — 296 — 296 
Substandard5,203 — 5,203 — 5,203 
Total1,966,228 255 1,966,483 — 1,966,483 
Total multifamily2,199,187 547 2,199,734 — 2,199,734 
Home equity and lines of credit     
Pass86,380 167 86,547 — 86,547 
Special Mention14 — 14 — 14 
Substandard131 — 131 156 287 
Total home equity and lines of credit86,525 167 86,692 156 86,848 
Commercial and industrial loans     
Pass44,886 189 45,075 — 45,075 
Special Mention301 — 301 — 301 
Substandard80 — 80 — 80 
Total commercial and industrial loans45,267 189 45,456 — 45,456 
Other loans - Pass2,058 26 2,084 — 2,084 
Total originated loans held-for-investment2,980,106 3,753 2,983,859 3,208 2,987,067 
32
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 December 31, 2019
 Performing (Accruing) Loans  
 0-29 Days Past Due30-89 Days Past DueTotalNon-Performing LoansTotal Loans Receivable, net
Loans Acquired
Real estate loans:
One-to-four family residential     
LTV < 60%     
Pass172,882 73 172,955 — 172,955 
Special Mention— 385 385 — 385 
Substandard— — — 426 426 
Total172,882 458 173,340 426 173,766 
LTV => 60%     
Pass14,116 — 14,116 — 14,116 
Substandard— — — 93 93 
Total14,116 — 14,116 93 14,209 
Total one-to-four family residential186,998 458 187,456 519 187,975 
Commercial     
LTV < 35%     
Pass35,173 287 35,460 — 35,460 
Special Mention994 194 1,188 — 1,188 
Substandard369 — 369 334 703 
Total36,536 481 37,017 334 37,351 
LTV => 35%     
Pass60,311 — 60,311 — 60,311 
Special Mention134 464 598 — 598 
Substandard6,382 2,960 9,342 5,425 14,767 
Total66,827 3,424 70,251 5,425 75,676 
Total commercial103,363 3,905 107,268 5,759 113,027 
Construction and land     
Pass2,537 — 2,537 — 2,537 
Total construction and land2,537 — 2,537 — 2,537 
Multifamily     
LTV < 35%     
Pass105,327 — 105,327 — 105,327 
Substandard— — — 40 40 
Total105,327 — 105,327 40 105,367 
LTV => 35%     
Pass2,653 — 2,653 — 2,653 
Substandard— — — 397 397 
Total2,653 — 2,653 397 3,050 
Total multifamily107,980 — 107,980 437 108,417 
Home equity and lines of credit
Pass11,842 50 11,892 — 11,892 
Substandard88 — 88 28 116 
Total home equity and lines of credit11,930 50 11,980 28 12,008 
Commercial and industrial loans
Pass8,649 40 8,689 — 8,689 
Total commercial and industrial loans8,649 40 8,689 — 8,689 
Other— — — — — 
Total loans acquired421,457 4,453 425,910 6,743 432,653 
$3,401,563 $8,206 $3,409,769 $9,951 $3,419,720 
33
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
The following table summarizes originated and acquired impaired loans as of September 30, 2020, and December 31, 2019 (in thousands):
 September 30, 2020December 31, 2019
 Recorded InvestmentUnpaid Principal BalanceRelated AllowanceRecorded InvestmentUnpaid Principal BalanceRelated Allowance
With No Allowance Recorded:   
Real estate loans:   
Commercial   
LTV < 35%   
Substandard$79 $218 $— $— $139 $— 
LTV => 35%   
Pass3,585 4,334 — 5,582 6,468 — 
Special Mention502639— — — — 
Substandard8,431 8,638 — 10,438 11,002 — 
One-to-four family residential   
LTV < 60%   
Pass801 892 — 1,379 1,463 — 
Special Mention374 374 — 385 385 — 
Substandard729 729 — 564 564 — 
LTV => 60%
Pass116 152 — 122 154 — 
Substandard23 23 — 29 29 — 
Multifamily   
LTV < 35%
Substandard39 39 — 40 40 — 
LTV => 35%   
Pass— — — 26 496 — 
Special Mention19 490 — — — — 
Substandard610 610 — 972 972 — 
Home equity and lines of credit
Pass17 17 — 22 22 — 
Commercial and industrial loans   
Substandard37 37 — 39 39 — 
With a Related Allowance
Recorded:		   
Real estate loans:   
Commercial   
LTV => 35%   
Pass1,296 1,296 (18)— — — 
Substandard2,781 3,401 (284)1,307 1,307 (135)
One-to-four family residential   
LTV < 60%
Substandard— — — — — — 
Home equity and lines of credit   
Substandard32 32 (3)33 33 (3)
Commercial and industrial loans   
Special Mention17 17 (3)19 19 (4)
Total:   
Real estate loans   
Commercial16,674 18,526 (302)17,327 18,916 (135)
One-to-four family residential2,043 2,170 — 2,479 2,595 — 
Multifamily668 1,139 — 1,038 1,508 — 
Home equity and lines of credit49 49 (3)55 55 (3)
Commercial and industrial loans54 54 (3)58 58 (4)
 $19,488 $21,938 $(308)$20,957 $23,132 $(142)
34
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Included in the above tables at September 30, 2020, are impaired loans with carrying balances of $13.1 million that were not written down by charge-offs or for which there are no specific reserves in our allowance for loan losses. Included in impaired loans at December 31, 2019, are loans with carrying balances of $15.9 million that were not written down by charge-offs or for which there are no specific reserves in our allowance for loan losses. Loans not written down by charge-offs or specific reserves at September 30, 2020, and December 31, 2019, are considered to have sufficient collateral values, less costs to sell, to support the carrying balances of the loans.

The following table summarizes the average recorded investment in originated and acquired impaired loans (excluding PCI loans) and interest recognized on impaired loans as of, and for, the three and nine months ended September 30, 2020, and September 30, 2019 (in thousands):
35
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Three Months EndedNine Months Ended
 September 30, 2020September 30, 2019September 30, 2020September 30, 2019
 Average Recorded InvestmentInterest IncomeAverage Recorded InvestmentInterest IncomeAverage Recorded InvestmentInterest IncomeAverage Recorded InvestmentInterest Income
With No Allowance Recorded:  
Real estate loans:  
Commercial  
LTV < 35%  
Substandard$79 $— $— $40 $2 $— 
LTV => 35%
Pass3,607 37 5,714 78 4,572 145 5,801 236 
Special Mention507 10 — 253 30 — — 
Substandard8,440 3 10,707 54 9,550 159 11,156 183 
Construction and Land
One-to-four family residential
LTV < 60%
Pass929 9 1,599 16 1,150 38 1,638 49 
Special Mention376 5 195 6 380 16 97 17 
Substandard474 8 233 4 517 27 236 8 
LTV => 60%
Pass117 1 124 1 119 3 126 3 
Substandard24 — 62 1 26 1 101 7 
Multifamily
LTV < 35%
Substandard40 — 41 — 40 1 71 1 
LTV => 35%
Pass— — 30 4 12 — 34 12 
Special Mention21 4 — 10 11 — — 
Substandard611 6 974 13 791 28 1,101 48 
Home equity and lines of credit
Pass18 1 24 — 19 1 26 1 
Commercial and industrial loans
Substandard37 — 44 38 — 47 — 
With a Related Allowance Recorded:
Real estate loans:
Commercial
LTV => 35%
Pass1,307 16 — 654 49 — — 
Substandard2,790 10 1,566 — 1,860 34 912 17 
One-to-four family residential
LTV < 60%
Substandard261 — 342 5 131 — 422 14 
LTV => 60%
Multifamily
LTV => 35%
Home equity and lines of credit
Substandard32 — 33 32 1 33 1 
Commercial and industrial loans
Special Mention17 — 20 17 — 20 1 
Total:
Real estate loans
Commercial16,730 76 17,987 132 16,929 419 17,869 436 
One-to-four family residential2,181 23 2,555 33 2,323 85 2,620 98 
Multifamily672 10 1,045 17 853 40 1,206 61 
Home equity and lines of credit50 1 57 — 51 2 59 2 
Commercial and industrial loans54 — 64 — 55 — 67 1 
 $19,687 $110 $21,708 $182 $20,211 $546 $21,821 $598 
    

36
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
There were no loans modified in a troubled debt restructurings (TDR) during the three months ended September 30, 2020 or 2019.
    
The following tables summarizes loans that were modified in a TDR during the nine months ended September 30, 2020 or 20 19:
Nine Months Ended September 30, 2020
 Number of RelationshipsPre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment(1)
 (in thousands)
Troubled Debt Restructurings   
Residential1$187 $187 
Commercial real estate2544 544 
Total Troubled Debt Restructurings3$731 $731 
(1) Amounts are at time of modification
Nine Months Ended September 30, 2019
 Number of RelationshipsPre-Modification Outstanding Recorded Investment
Post-Modification Outstanding Recorded Investment(1)
 (in thousands)
Troubled Debt Restructurings   
Consumer1$2 $2 
Commercial real estate12,834 2,834 
Total Troubled Debt Restructurings2$2,836 $2,836 
(1) Amounts are at time of modification
There were four loans (to three borrowers) in the first table above, that requested relief due to circumstances related to COVID-19 and were modified as troubled debt restructurings (TDRs) during the nine months ended September 30, 2020, all of which were modified to restructure payment terms. All four of the loans were delinquent and on non-accrual status prior to the implementation of our COVID-19 customer relief program (discussed further below) and were therefore considered to be TDRs.
In response to the COVID-19 pandemic and its economic impact to customers, a short-term modification program that complied with Section 4013 of the CARES Act and the Interagency Statement on Loan Modifications and Reporting for Financial Institutions Working with Customers Affected by the Coronavirus was implemented to provide temporary payment relief to those borrowers directly impacted by COVID-19. The program allows for a deferral of payments for 90 days, which may extend for an additional 90 days, with modifications in the form of payment deferrals, fee waivers, extensions of repayment terms, or other delays in payment. As of September 30, 2020, the Company had 85 loan modifications (excluding PCI loans) with principal and/or interest payment deferrals on outstanding loan balances of $105.6 million. Of these 85 payment deferrals, 19 were principal deferrals totaling $40.8 million, and 66 were principal and interest deferrals totaling $64.8 million. As these deferrals were current as of December 31, 2019, or the date of modification, these loans are not considered TDRs. Loans in deferment status (“COVID-19 Modified Loans”) will continue to accrue interest during the deferment period unless otherwise classified as nonperforming. COVID-19 Modified Loans are required to make escrow payments for real estate taxes and insurance, if applicable. For loans given relief of interest, the deferred interest is generally to be paid back over a period not to exceed 18 months. Principal deferrals may be brought current or recast into outstanding principal at time of rate reset or repaid at the end of the loan's contractual term. COVID-19 Modified Loan agreements generally also include covenants that prohibit distributions, bonuses, or payments of management fees to related entities until all deferred payments are made.
At September 30, 2020, and December 31, 2019, we had TDRs of $17.4 million and $18.5 million, respectively.

37
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
    Management classifies all TDRs as impaired loans. Impaired loans are individually assessed to determine that the loan’s carrying value is not in excess of the estimated fair value of the collateral less cost to sell, if the loan is collateral dependent, or the present value of the expected future cash flows, if the loan is not collateral dependent. Management performs an evaluation of each impaired loan and generally obtains updated appraisals as part of the evaluation. In addition, management adjusts estimated fair values down to appropriately consider recent market conditions, our willingness to accept a lower sales price to effect a quick sale, and costs to dispose of any supporting collateral. Determining the estimated fair value of underlying collateral (and related costs to sell) can be difficult in illiquid real estate markets and is subject to significant assumptions and estimates. Management employs an independent third-party management firm that specializes in appraisal preparation and review to ascertain the reasonableness of updated appraisals. Projecting the expected cash flows under troubled debt restructurings which are not collateral dependent is inherently subjective and requires, among other things, an evaluation of the borrower’s current and projected financial condition. Actual results may be significantly different than our projections and our established allowance for loan losses on these loans, which could have a material effect on our financial results.

At September 30, 2020, or September 30, 2019, there were no TDRs that were restructured during the preceding twelve months that subsequently defaulted.

Note 7 – Deposits

    Deposits account balances are summarized as follows (in thousands):
 September 30, 2020December 31, 2019
Non-interest-bearing checking$706,072 $387,409 
Negotiable orders of withdrawal (NOW) and interest-bearing checking897,575 573,927 
Savings and money market1,734,916 1,398,345 
Certificates of deposit782,601 1,048,552 
Total deposits$4,121,164 $3,408,233 
 
    Interest expense on deposit accounts is summarized for the periods indicated (in thousands):
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
NOW and interest-bearing checking, savings, and money market$2,023 $5,281 $8,990 $15,452 
Certificates of deposit3,620 5,235 13,405 15,860 
Total interest expense on deposit accounts$5,643 $10,516 $22,395 $31,312 

Note 8 – Equity Incentive Plans

    On May 22, 2019, the Northfield Bancorp, Inc. 2019 Equity Incentive Plan (the “2019 EIP”) was approved by stockholders of the Company. Under the 2019 EIP, the maximum number of shares of stock that may be delivered to participants in the form of stock options, stock appreciation rights (“SARs”), restricted stock awards, or restricted stock units is 6,000,000. To the extent an equity award is issued in the form of a restricted stock grant or restricted stock unit, the number of stock options/SARs that can be granted is reduced by 4.5. The maximum number of shares of stock that may be delivered to participants in the form of restricted stock awards and restricted stock units is 1,333,333 shares. Prior to May 22, 2019, the Company also maintained the Northfield Bancorp, Inc. 2014 Equity Incentive Plan (the “2014 EIP”). Upon approval of the 2019 EIP, the 2014 EIP was frozen and equity awards that would otherwise have been available for issuance are no longer available for grant. No stock options have been granted under the 2019 EIP.
38
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)

    The following table is a summary of the Company’s stock options outstanding as of September 30, 2020, and changes therein during the nine months then ended.
 Number of Stock OptionsWeighted Average Grant Date Fair ValueWeighted Average Exercise PriceWeighted Average Contractual Life (years)
Outstanding - December 31, 20192,227,193 $4.01 $13.93 4.96
Exercised(13,000)3.93 13.38 — 
Outstanding - September 30, 20202,214,193 4.01 13.94 4.21
Exercisable - September 30, 20202,189,114 4.00 13.91 4.20
 Expected future stock option expense related to the non-vested options outstanding as of September 30, 2020, is $46,000 over a weighted average period of 1.1 years.
On February 17, 2020, the Company granted to directors and employees, under the 2019 EIP, 83,744 restricted stock units with a total grant-date fair value of $1.3 million. Of these grants, 28,460 vest one year from the date of grant and 55,284 vest in equal installments over a five-year period beginning one year from the date of grant. The Company also issued 19,837 performance-based restricted stock units to its executive officers with a total grant date fair value of $313,623. Vesting of the performance-based restricted stock units will be based on achievement of certain levels of Core Return on Average Assets and will cliff-vest after a three-year measurement period ended December 31, 2022, based on the Company's performance relative to a peer group as determined by the Compensation Committee of the Board. At the end of the performance period, the number of actual shares to be awarded may vary between 0% and 225% of target amounts.

The following is a summary of the status of the Company’s restricted stock awards as of September 30, 2020, and changes therein during the nine months then ended.
 Number of Shares AwardedWeighted Average Grant Date Fair Value
Non-vested at December 31, 201971,102 $15.36 
Granted103,581 15.81 
Vested(63,100)14.97 
Forfeited(1,225)15.81 
Non-vested at September 30, 2020110,358 16.00 
 
Expected future stock award expense related to the non-vested restricted share awards as of September 30, 2020, is $1.3 million over a weighted average period of 4.4 years.
    During the three months ended September 30, 2020 and September 30, 2019, the Company recorded $217,000 and $425,000, respectively, of stock-based compensation related to the above plans. During the nine months ended September 30, 2020, and September 30, 2019, the Company recorded $1.1 million and $2.9 million, respectively, of stock-based compensation related to the above plans.

Note 9 – Fair Value Measurements
    The following tables present the assets reported on the consolidated balance sheets at their estimated fair value as of September 30, 2020, and December 31, 2019, by level within the fair value hierarchy as required by the Fair Value Measurements and Disclosures Topic of the FASB Accounting Standards Codification (“ASC”). Financial assets and liabilities are classified in their entirety based on the level of input that is significant to the fair value measurement. The fair value hierarchy is as follows:

•Level 1 Inputs – Unadjusted quoted prices in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

•Level 2 Inputs – Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (for example, interest rates, volatilities,
39
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
prepayment speeds, loss severities, credit risks and default rates) or inputs that are derived principally from or corroborated by observable market data by correlations or other means.

•Level 3 Inputs – Significant unobservable inputs that reflect the Company’s own assumptions that market participants would use in pricing the assets or liabilities.

The methods of determining the fair value of assets and liabilities presented in this note are consistent with our methodologies disclosed in Note 14 to the Consolidated Financial Statements of the Company’s 2019 Annual Report on Form 10-K.
 Fair Value Measurements at September 30, 2020 Using:
 Carrying ValueQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
 (in thousands)
Measured on a recurring basis: 
Assets:    
Investment securities:    
Debt securities available-for-sale:    
U.S. Government Agency$3,170 $— $3,170 $— 
Mortgage-backed securities:    
Pass-through certificates:
GSE$312,051 $— $312,051 $— 
REMICs:
GSE753,955 — 753,955 — 
Non-GSE6 — 6 — 
1,069,182 — 1,069,182 — 
Other debt securities    
Municipal bonds229 — 229 — 
Corporate bonds101,175 — 101,175 — 
Asset-backed securities844 — 844 — 
102,248 — 102,248 — 
Total debt securities available-for-sale1,171,430 — 1,171,430 — 
Trading securities10,993 10,993 — — 
Equity securities4,502 4,502 — — 
Total$1,186,925 $15,495 $1,171,430 $— 
Measured on a non-recurring basis:    
Assets:    
Impaired loans:    
Real estate loans:    
Commercial real estate$6,052 $— $— $6,052 
Multifamily19 — — 19 
Home equity and lines of credit29 — — 29 
Total impaired real estate loans6,100 — — 6,100 
Commercial and industrial loans13 — — 13 
Total$6,113 $— $— $6,113 
40
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
 Fair Value Measurements at December 31, 2019 Using:
 Carrying ValueQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs (Level 3)
 (in thousands)
Measured on a recurring basis: 
Assets:    
Investment securities:    
Debt securities available-for-sale:    
Mortgage-backed securities:    
Pass-through certificates:
GSE$329,407 $— $329,407 $— 
REMICs:
GSE643,667 — 643,667 — 
Non-GSE53 — 53 — 
973,127 — 973,127 — 
Other debt securities    
Municipal bonds299 — 299 — 
Corporate bonds164,926 — 164,926 — 
165,225 — 165,225 — 
Total debt securities available-for-sale1,138,352 — 1,138,352 — 
Trading securities11,222 11,222 — — 
Equity securities250 250 — — 
Total$1,149,824 $11,472 $1,138,352 $— 
Measured on a non-recurring basis:    
Assets:    
Impaired loans:    
Real estate loans:    
Commercial real estate$4,871 $— $— $4,871 
Multifamily26 — — 26 
Home equity and lines of credit30 — — 30 
Total impaired real estate loans4,927 — — 4,927 
Commercial and industrial loans15 — — 15 
Total$4,942 $— $— $4,942 
    The following table presents qualitative information for Level 3 assets measured at fair value on a non-recurring basis at September 30, 2020, and December 31, 2019 (dollars in thousands):
Fair ValueValuation MethodologyUnobservable Inputs       Range of Inputs
 September 30, 2020December 31, 2019  September 30, 2020December 31, 2019
Impaired loans$6,113 $4,942 AppraisalsDiscount for costs to sell7.0%7.0%
  Discount for quick sale10.0%10.0%
 Discounted cash flowsInterest rates
4.13% to 6.25%
4.13% to 6.25%
41
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
    
The valuation techniques described below were used to measure fair value of financial instruments in the tables below on a recurring basis and a non-recurring basis as of September 30, 2020, and December 31, 2019.
    Debt Securities Available for Sale: The estimated fair values for mortgage-backed securities, corporate, and other debt securities are obtained from an independent nationally recognized third-party pricing service. The estimated fair values are derived primarily from cash flow models, which include assumptions for interest rates, credit losses, and prepayment speeds. Broker/dealer quotes are utilized as well, when such quotes are available and deemed representative of the market. The significant inputs utilized in the cash flow models are based on market data obtained from sources independent of the Company (Observable Inputs), and are therefore classified as Level 2 within the fair value hierarchy. There were no transfers of securities between Level 1 and Level 2 during the nine months ended September 30, 2020.     
    Trading Securities: Fair values are derived from quoted market prices in active markets. The assets consist of publicly traded mutual funds.

    Equity Securities: Fair values of equity securities consisting of publicly traded mutual funds are derived from quoted market prices in active markets.
 
    Impaired Loans: At September 30, 2020, and December 31, 2019, the Company had impaired loans held-for-investment (excluding PCI loans) with outstanding principal balances of $8.6 million and $7.0 million, respectively, which were recorded at their estimated fair value of $6.1 million and $4.9 million, respectively. The Company recorded a net increase in the specific reserve for impaired loans of $166,000 and $117,000 for the nine months ended September 30, 2020, and September 30, 2019, respectively. Net charge-offs of $260,000 and net recoveries of $1.3 million were recorded for the nine months ended September 30, 2020, and September 30, 2019, respectively, utilizing level 3 inputs. For purposes of estimating the fair value of impaired loans, management utilizes independent appraisals, if the loan is collateral dependent, adjusted downward by management, as necessary, for changes in relevant valuation factors subsequent to the appraisal date, or the present value of expected future cash flows for non-collateral dependent loans and troubled debt restructurings.
 
    In addition, the Company may be required, from time to time, to measure the fair value of certain other financial assets on a nonrecurring basis in accordance with U.S. GAAP. The adjustments to fair value usually result from the application of lower-of-cost-or-market accounting or write downs of individual assets.
 
Fair Value of Financial Instruments
     The FASB ASC Topic for Financial Instruments requires disclosure of the fair value of financial assets and financial liabilities, including those financial assets and financial liabilities that are not measured and reported at fair value on a recurring or non-recurring basis. The methodologies for estimating the fair value of financial assets and financial liabilities that are measured at fair value on a recurring or non-recurring basis are discussed above. The following methods and assumptions were used to estimate the fair value of other financial assets and financial liabilities not already discussed above:
 
(a)     Cash and Cash Equivalents
Cash and cash equivalents are short-term in nature with original maturities of three months or less; the carrying amount approximates fair value. Certificates of deposit having original terms of six-months or less; the carrying value generally approximates fair value. Certificates of deposit with an original maturity of six months or greater; the fair value is derived from discounted cash flows.
(b)    Debt Securities (Held to Maturity)
The estimated fair values for substantially all of our securities are obtained from an independent nationally recognized pricing service. The independent pricing service utilizes market prices of same or similar securities whenever such prices are available. Prices involving distressed sellers are not utilized in determining fair value. Where necessary, the independent third-party pricing service estimates fair value using models employing techniques such as discounted cash flow analysis. The assumptions used in these models typically include assumptions for interest rates, credit losses, and prepayments, utilizing market observable data where available.
42
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
(c)    Investments in Equity Securities at Net Asset Value Per Share

The Company uses net asset value as a practical expedient to record its investment in a private SBA Loan Fund since the shares in the fund are not publicly traded, do not have a readily determinable fair value and the net asset value per share is calculated in a manner consistent with the measurement principles of an investment company.
 
(d)    Federal Home Loan Bank of New York Stock

The fair value for Federal Home Loan Bank of New York (FHLB) stock is its carrying value, since this is the amount for which it could be redeemed and there is no active market for this stock.
 
(e)    Loans (Held-for-Investment)
Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type such as originated and purchased, and further segregated by residential mortgage, construction, land, multifamily, commercial and consumer. Each loan category is further segmented into amortizing and non-amortizing and fixed and adjustable rate interest terms and by performing and nonperforming categories. The fair value of loans is estimated using a discounted cash flow analysis. The discount rates used to determine fair value use interest rate spreads that reflect factors such as liquidity, credit, and nonperformance risk of the loans.
 
(f)    Loans (Held-for-Sale)
Held-for-sale loans are carried at the lower of aggregate cost or estimated fair value, less costs to sell, and therefore fair value is equal to carrying value.
 
(g)    Deposits
The fair value of deposits with no stated maturity, such as non-interest bearing demand deposits, savings, NOW and money market accounts, is equal to the amount payable on demand. The fair value of certificates of deposit is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities.
 
(h)    Commitments to Extend Credit and Standby Letters of Credit

The fair value of commitments to extend credit and standby letters of credit is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties. For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates. The fair value of off-balance sheet commitments is insignificant and therefore not included in the following table.
 (i)    Borrowings
The fair value of borrowed funds is estimated by discounting future cash flows based on rates currently available for debt with similar terms and remaining maturity.
 
(j)    Advance Payments by Borrowers for Taxes and Insurance
Advance payments by borrowers for taxes and insurance have no stated maturity; the fair value is equal to the amount currently payable.

(k)                Derivatives

The fair value of the Company's derivatives is determined using discounted cash flow analysis using observable market-based inputs, which are considered Level 2 inputs.
43
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)

    The estimated fair value of the Company’s financial instruments at September 30, 2020, and December 31, 2019, is presented in the following tables (in thousands):
 September 30, 2020
  Estimated Fair Value
 Carrying ValueLevel 1Level 2Level 3Total
Financial assets:     
Cash and cash equivalents$350,839 $350,839 $— $— $350,839 
Trading securities10,993 10,993 — — 10,993 
Debt securities available-for-sale1,171,430 — 1,171,430 — 1,171,430 
Debt securities held-to-maturity8,106 — 8,475 — 8,475 
Equity securities4,502 4,502 — — 4,502 
Federal Home Loan Bank of New York stock, at cost29,766 — 29,766 — 29,766 
Net loans held-for-investment3,692,901 — — 3,748,211 3,748,211 
Derivative assets1,863 — 1,863 — 1,863 
Financial liabilities:     
Deposits$4,121,164 $— $4,128,474 $— $4,128,474 
Borrowed funds616,905 — 637,760 — 637,760 
Advance payments by borrowers for taxes and insurance17,329 — 17,329 — 17,329 
Derivative liabilities1,868 — 1,868 — 1,868 
 December 31, 2019
  Estimated Fair Value
 Carrying ValueLevel 1Level 2Level 3Total
Financial assets:     
Cash and cash equivalents$147,818 $147,818 $— $— $147,818 
Trading securities11,222 11,222 — — 11,222 
Debt securities available-for-sale1,138,352 — 1,138,352 — 1,138,352 
Debt securities held-to-maturity8,762 — 8,886 — 8,886 
Equity securities (1)
250 250 — 250 
Federal Home Loan Bank of New York stock, at cost39,575 — 39,575 — 39,575 
Net loans held-for-investment3,408,378 — — 3,482,804 3,482,804 
Derivative assets79 — 79 — 79 
Financial liabilities:     
Deposits$3,408,233 $— $3,412,414 $— $3,412,414 
Borrowed funds857,004 — 862,980 — 862,980 
Advance payments by borrowers for taxes and insurance44,069 — 44,069 — 44,069 
Derivative liabilities79 — 79 — 79 
 (1) Excludes investments measured at net asset value in the amount of $3.1 million at December 31, 2019, which has not been classified in the fair value hierarchy.
44
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Limitations
    Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These estimates do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected losses, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and, therefore, cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on-and off-balance sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. In addition, the tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in the estimates.
Note 10 – Earnings Per Share
 
Basic earnings per share is computed by dividing net income available to common stockholders by the weighted average number of shares outstanding during the period. For purposes of calculating basic earnings per share, weighted average common shares outstanding excludes unallocated employee stock ownership plan (“ESOP”) shares that have not been committed for release and unvested restricted stock.

Diluted earnings per share is computed using the same method as basic earnings per share, but reflects the potential dilution that could occur if stock options and unvested shares of restricted stock were exercised and converted into common stock. These potentially dilutive shares would then be included in the weighted average number of shares outstanding for the period using the treasury stock method. When applying the treasury stock method we added the assumed proceeds from option exercises and the average unamortized compensation costs related to unvested shares of restricted stock and stock options. We then divided this sum by our average stock price for the period to calculate assumed shares repurchased. The excess of the number of shares issuable over the number of shares assumed to be repurchased is added to basic weighted average common shares to calculate diluted earnings per share.
 
The following is a summary of the Company’s earnings per share calculations and reconciliation of basic to diluted earnings per share for the periods indicated (in thousands, except per share data):
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Net income available to common stockholders$8,582 $13,139 $23,926 $30,114 
Weighted average shares outstanding-basic50,707,691 46,631,008 48,131,005 46,808,188 
Effect of non-vested restricted stock and stock options outstanding12,112 348,206 79,276 370,502 
Weighted average shares outstanding-diluted50,719,803 46,979,214 48,210,281 47,178,690 
Earnings per share-basic$0.17 $0.28 $0.50 $0.64 
Earnings per share-diluted$0.17 $0.28 $0.50 $0.64 
Anti-dilutive shares2,287,010 176,944 1,868,511 700,512 
45
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Note 11 – Leases

    The Company’s leases primarily relate to real estate property for branches and office space with terms extending from six months up to 35 years. At September 30, 2020, all of the Company's leases are classified as operating leases, which are required to be recognized on the consolidated statements of financial condition as a right-of-use asset and a corresponding lease liability.

    The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use assets and operating lease liabilities in the consolidated balance sheets. Right-of-use assets represent the right to use an underlying asset for the lease term and lease liabilities represent the obligation to make lease payments arising from the lease. Operating lease right-of-use assets and liabilities are recorded at the present value of lease payments over the lease term. As the Company's leases do not provide an implicit rate, the Company uses its incremental borrowing rate, at lease inception, over a similar term in determining the present value of lease payments. Certain leases include options to renew, with one or more renewal terms ranging from five to ten years. If the exercise of a renewal option is considered to be reasonably certain, the Company includes the extended term in the calculation of the right-of-use asset and lease liability.

    At September 30, 2020, the Company’s operating lease right-of-use assets and operating lease liabilities included in the consolidated balance sheet were $43.6 million and $48.1 million, respectively. Operating lease expense is recognized on a straight-line basis over the lease term, while variable lease payments are recognized as incurred. Variable lease payments include common area maintenance charges, real estate taxes, repairs and maintenance costs and utilities. Operating and variable lease expenses are recorded in occupancy expense in the consolidated statements of comprehensive income.
    Supplemental lease information at or for the nine months ended September 30, 2020, and September 30, 2019 is as follows (dollars in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Operating lease cost$2,073 $1,551 $4,935 $4,568 
Variable lease cost878 663 2,378 2,152 
Net lease cost$2,951 $2,214 $7,313 $6,720 
Cash paid for amounts included in measurement of operating lease liabilities$2,111 $1,528 $5,180 $4,368 
Right-of-use assets obtained in exchange for new operating lease liabilities$— $— $3,028 $1,013 
Weighted average remaining lease term 12.39 years12.68 years
Weighted average discount rate 3.55 %3.61 %
    The following table summarizes lease payment obligations for each of the next five years and thereafter in addition to a reconcilement to the Company's current lease liability (in thousands):
YearAmount
2020$1,700 
20216,555 
20225,959 
20235,942 
20245,562 
Thereafter35,873 
Total lease payments61,591 
Less: imputed interest13,501 
Present value of lease liabilities$48,090 
    As of September 30, 2020, the Company had not entered into any leases that have not yet commenced.

46
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Note 12 – Revenue Recognition
    
    The Company records revenue from contracts with customers in accordance with ASU 2014-09, Revenue from Contracts with Customers (“Topic 606”). The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Topic 606 does not apply to revenue associated with financial instruments, including revenue from loans and securities, which comprise the majority of the Company’s revenue.
    The Company’s revenue streams that are within the scope of Topic 606 include service charges on deposit accounts, ATM and card interchange fees, investment services fees, and other miscellaneous income. Fees and service charges for customer services include: (i) service charges on deposit accounts, including account maintenance fees, overdraft fees, insufficient funds fees, wire fees, and other deposit related fees; (ii) ATM and card interchange fees, which include fees generated when a Bank cardholder uses a non-Bank ATM or a non-Bank cardholder uses a Bank ATM, and fees earned whenever the Bank's debit cards are processed through card payment networks such as Visa; and (iii) investment services fees earned through partnering with a third party investment and brokerage service firm to provide insurance and investment products to customers. The Company's performance obligation for fees and service charges is satisfied and related revenue recognized immediately or in the month of performance of services. Other income primarily includes rental income from subleasing one of the Company's branches to a third party, which is recognized at the time the transaction occurs.
    The following table summarizes non-interest income for the periods indicated (in thousands):
 Three Months Ended September 30,Nine Months Ended September 30,
 2020201920202019
Fees and service charges for customer services:
Service charges$565 $864 $1,674 $2,458 
ATM and card interchange fees351 343 930 983 
Investment fees93 79 191 192 
Total fees and service charges for customer services1,009 1,286 2,795 3,633 
Income on bank owned life insurance(1)
894 3,268 2,635 5,071 
Gains on available-for-sale debt securities, net(1)
45 123 105 337 
Gains (losses) on trading securities, net(1)
763 28 397 1,457 
Gains on sale of loans(1)
— — 665 — 
Swap income(1)
307— 691 — 
Other4 28 81 115 
Total non-interest income$3,022 $4,733 $7,369 $10,613 
(1) Not in scope of Topic 606

Note 13 – Derivatives

    The Company has interest rate derivatives resulting from a service provided to certain qualified borrowers in a loan-related transaction and, therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The interest rate swap agreement which the Company executes with the commercial borrower is collateralized by the borrower’s commercial real estate financed by the Company. The collateral exceeds the maximum potential amount of future payments under the credit derivative. As these interest rate swaps do not meet the hedge accounting requirements, changes in the fair value of both the customer swaps and the offsetting swaps are recognized directly in earnings.

    During the fourth quarter of 2019, the Company entered into its first derivative transaction. At September 30, 2020, the Company had six interest rate swaps with a notional amount of $34.4 million, and the fair value of the asset and liability derivative was $1.9 million. At December 31, 2019, the Company had one interest rate swap with a notional amount of $12.0 million, and the fair value of the asset and liability derivative was $79,000. The derivative asset is included in other assets on the balance sheet and the derivative liability is included in accrued expenses and other liabilities on the balance sheet. For the three and nine months ended September 30, 2020, the Company recorded net fee income of approximately $307,000 and $691,000, respectively.

47
NORTHFIELD BANCORP, INC.
Notes to Unaudited Consolidated Financial Statements - (Continued)
Note 14 – Recent Accounting Pronouncements Adopted

    ASU No. 2018-15. In August 2018, the FASB issued ASU No. 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract.” This guidance aligns the accounting for implementation costs related to a hosting arrangement that is a service contract with the guidance on capitalizing costs associated with developing or obtaining internal-use software. Specifically, where a cloud computing arrangement includes a license to internal-use software, the software license is accounted for by the customer in accordance with Subtopic 350-40, “Intangibles - Goodwill and Other-Internal-Use Software”. ASU No. 2018-15 is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU No. 2018-15 on January 1, 2020, and it did not have an impact on the Company's financial condition or results of operation.
    
    ASU No. 2018-13. In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU updates the disclosure requirements on Fair Value measurements by 1) removing: the disclosures for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements; 2) modifying: disclosures for timing of liquidation of an investee’s assets and disclosures for uncertainty in measurement as of reporting date; and 3) adding: disclosures for changes in unrealized gains and losses included in other comprehensive income for recurring level 3 fair value measurements and disclosures for the range and weighted average of the significant unobservable inputs used to develop Level 3 fair value measurements. ASU No. 2018-13 is effective for fiscal years beginning after December 15, 2019. With the exception of the following, which should be applied prospectively, disclosures relating to changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the disclosures for uncertainty measurement, all other changes should be applied retrospectively to all periods presented upon the effective date. The Company adopted ASU No. 2018-13 on January 1, 2020, and it did not have an impact on the Company's financial condition or results of operation.

    ASU No 2017-04. In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment.” The ASU eliminates Step 2 from the goodwill impairment test and also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step 2 of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The ASU is effective for annual or any interim goodwill impairment tests in fiscal years beginning after December 15, 2019. The Company adopted ASU No. 2017-04 on January 1, 2020, and it did not have an impact on the Company's financial condition or results of operation.

    During the nine months ended September 30, 2020, the Company qualitatively assessed the current economic environment, including the estimated impact of the COVID-19 pandemic on macroeconomic variables and economic forecasts, and on the Company's stock price which has experienced a decline in value, and how these might impact the fair value of its reporting unit. After consideration of the items above, the results for the nine months ended September 30, 2020, as well as the results of the annual 2019 impairment test which resulted in an excess of reporting unit fair value over book value of approximately 27%, the Company determined that it was more-likely-than-not that the fair value of its reporting unit was above its book value as of September 30, 2020. For additional information regarding the Company's goodwill impairment testing process, see Note 1 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2019.
48
ITEM 2.    MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Cautionary Statement Regarding Forward-Looking Statements
    This Quarterly Report contains certain “forward-looking statements,” which can be identified by the use of such words as “estimate,” “project,” “believe,” “intend,” “anticipate,” “plan,” “seek,” “expect,” “annualized,” “could,” “may,” “should,” “will,” and words of similar meaning. These forward-looking statements include, but are not limited to:

•statements of our goals, intentions, and expectations;
•statements regarding our business plans, prospects, growth and operating strategies;
•statements regarding the quality of our loan and investment portfolios; and
•estimates of our risks and future costs and benefits. 
    These forward-looking statements are based on the current beliefs and expectations of our management and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, these forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. 

    The following factors, among others, could cause actual results to differ materially from the anticipated results or other expectations expressed in the forward-looking statements:   
•the disruption to local, regional, national and global economic activity caused by infectious disease outbreaks, including the recent outbreak of COVID-19, and the significant impact that such outbreak has had and may have on our growth, operations, earnings and asset quality;
•general economic conditions, either nationally or in our market areas, including employment prospects, real estate values and conditions, that are worse than expected;
•the effects of any civil unrest;
•competition among depository and other financial institutions;
•inflation and changes in the interest rate environment that reduce our margins and yields or reduce the fair value of financial instruments;
•adverse changes in the securities or credit markets;
•changes in laws, tax policies, or government regulations or policies affecting financial institutions, including changes in regulatory fees and capital requirements;
•our ability to enter new markets successfully and capitalize on growth opportunities;
•our ability to access cost-effective funding;
•our ability to successfully integrate acquired entities, including our proposed acquisition of VSB Bancorp, Inc.;
•changes in consumer demand, spending, borrowing and savings habits;
•changes in accounting policies and practices, as may be adopted by the bank regulatory agencies, the Financial Accounting Standards Board, or the Securities and Exchange Commission, or the Public Company Accounting Oversight Board;
•cyber attacks, computer viruses and other technological risks that may breach the security of our websites or other systems to obtain unauthorized access to confidential information and destroy data or disable our systems;
•technological changes that may be more difficult or expensive than expected;
•changes in our organization, compensation, and benefit plans;
•our ability to retain key employees;
•changes in the level of government support for housing finance;
•changes in monetary or fiscal policies of the U.S. Government, including policies of the U.S. Treasury and the FRB;
•the ability of third-party providers to perform their obligations to us;
•the ability of the U.S. Government to manage federal debt limits;
•the effects of any U.S. Government shutdowns;
•significant increases in our loan losses, including increases that may result from the new authoritative accounting guidance (known as CECL) model, which may increase the required level of our allowance for loan losses after adoption; and
•changes in the financial condition, results of operations, or future prospects of issuers of securities that we own.

49
    Given the ongoing and dynamic nature of current economic circumstances, it is difficult to predict the full impact of the COVID-19 outbreak on our business. The extent of such impact will depend on future developments, which are highly uncertain, including when the coronavirus can be controlled and abated and whether the gradual reopening of businesses will result in a meaningful increase in economic activity. As a result of the COVID-19 pandemic and the related adverse local and national economic consequences, we could be subject to any of the following risks, any of which could have a material, adverse effect on our business, financial condition, liquidity, and results of operations:

•demand for our products and services may decline, making it difficult to execute on our strategic initiatives related to growing assets and earnings;
•if the economy is unable to substantially reopen, and high levels of unemployment continue for an extended period of time, loan delinquencies, problem assets, and foreclosures may increase, resulting in increased charge-offs and reduced income;
•a worsening of business and economic conditions or a further downturn in the financial markets could result in an impairment of certain intangible assets, such as goodwill or our servicing assets;
•litigation, regulatory enforcement risk and reputation risk regarding our participation in the PPP and the risk that the SBA may not fund some or all PPP loan guaranties;
•disruptions in the businesses or the unavailability of the services of third parties we use in our operations such as property appraisers, loan servicers, providers of electronic payment and settlement systems, and local and federal government agencies and courthouses, could negatively affect our operations;
•collateral for loans, especially real estate, may decline in value, which could cause loan losses to increase;
•our allowance for loan losses may have to be increased if borrowers experience financial difficulties beyond forbearance periods, which will adversely affect our net income;
•the net worth and liquidity of loan guarantors may decline, impairing their ability to honor commitments to us;
•as the result of the decline in the FRB's target federal funds rate, the yield on our assets may decline to a greater extent than the decline in our cost of interest-bearing liabilities, reducing our net interest margin and spread and reducing net income;
•a material decrease in net income or a net loss over several quarters could result in a decrease or elimination of our quarterly cash dividend;
•potential goodwill impairment charges if acquired assets and operations are adversely affected and remain at reduced levels;
•our cyber security risks are increased as the result of an increase in the number of employees working remotely;
•Federal Deposit Insurance Corporation (“FDIC”) premiums may increase if the agency experience additional resolution costs;
•Internal controls as designed may not prove effective, to the extent procedures are modified as a result of remote work locations; and
•the unanticipated loss or unavailability of key employees due to the outbreak, which could harm our ability to operate our business or execute our business strategy, especially as we may not be successful in finding and integrating suitable successors.

Because of these and other uncertainties, our actual future results may be materially different from the results indicated by these forward-looking statements. Accordingly, you should not place undue reliance on such statements. Except as required by law, we disclaim any intention or obligation to update or revise any forward-looking statements after the date of this Quarterly Report on Form 10-Q, whether as a result of new information, future events or otherwise.

Critical Accounting Policies
 
    Note 1 to the Company’s Audited Consolidated Financial Statements for the year ended December 31, 2019, included in the Company’s Annual Report on Form 10-K, as supplemented by this report, contains a summary of significant accounting policies. Various elements of these accounting policies, by their nature, are inherently subject to estimation techniques, valuation assumptions and other subjective assessments. Certain assets are carried in the Consolidated Balance Sheets at estimated fair value or the lower of cost or estimated fair value. Policies with respect to the methodologies used to determine the allowance for loan losses, estimated cash flows of our purchased credit-impaired (“PCI”) loans, and judgments regarding the valuation allowance against deferred tax assets are the most critical accounting policies because they are important to the presentation of the Company’s financial condition and results of operations, involve a higher degree of complexity, and require management to make subjective judgments which often require assumptions or estimates about highly uncertain matters. The use of different judgments, assumptions, and estimates could result in material differences in the results of operations or financial condition. These critical accounting policies and their application are reviewed periodically and, at least annually, with the Audit Committee of the Board of Directors. For a further discussion of the critical accounting policies of the Company, see “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in the Company’s Annual Report
50
on Form 10-K for the year ended December 31, 2019.
Overview
    This overview highlights selected information and may not contain all the information that is important to you in understanding our performance during the period. For a more complete understanding of trends, events, commitments, uncertainties, liquidity, capital resources, and critical accounting estimates, you should read this entire document carefully, as well as our Annual Report on Form 10-K for the year ended December 31, 2019.
    Net income was $23.9 million for the nine months ended September 30, 2020, as compared to $30.1 million for the nine months ended September 30, 2019. Basic and diluted earnings per common share were $0.50 for the nine months ended September 30, 2020, compared to basic and diluted earnings per common share of $0.64 for the nine months ended September 30, 2019. For the nine months ended September 30, 2020, our return on average assets was 0.62%, as compared to 0.87% for the nine months ended September 30, 2019. For the nine months ended September 30, 2020, our return on average stockholders’ equity was 4.45% as compared to 5.92% for the nine months ended September 30, 2019. The most significant impact on our results of operations for the nine months ended September 30, 2020, was the increase in our provision for loan losses, which increased by $11.0 million for the nine months ended September 30, 2020, compared to a negative provision of $750,000 for the nine months ended September 30, 2019. The increase in the provision for loan losses was primarily due to increases in the qualitative factors used in determining the adequacy of the allowance for loan losses related to unemployment, loan risk rating changes and increased risks related to loans on forbearance resulting from economic uncertainty attributable to the COVID-19 pandemic. Net income for the nine months ended September 30, 2020 included merger-related expenses associated with the acquisition of VSB Bancorp, Inc. (“Victory”) of $3.3 million, net of tax, as well as a gain on sale of loans of $479,000, net of tax, and a corresponding reduction in loan loss provision of $445,000, net of tax, related to the sale of loans in the quarter ended June 30, 2020.

    Assets increased by $533.5 million, or 10.6%, to $5.59 billion at September 30, 2020, from $5.06 billion at December 31, 2019, primarily as a result of the Victory acquisition, which added $403.0 million to total assets. Liabilities increased $472.0 million, or 10.8%, to $4.83 billion at September 30, 2020, from $4.36 billion at December 31, 2019, primarily due to an increase in deposits of $712.9 million, partially offset by a decrease in borrowings of $240.1 million. The Victory acquisition added $354.6 million to deposits.

Comparison of Financial Condition at September 30, 2020, and December 31, 2019
    Total assets increased $533.5 million, or 10.6%, to $5.59 billion at September 30, 2020, from $5.06 billion at December 31, 2019, primarily as a result of the Victory acquisition, which added $403.0 million to total assets. Loans held-for-investment, net, increased by $294.5 million, or 8.6%, cash and cash equivalents increased by $203.0 million, or 137.3%, available-for sale debt securities increased by $33.1 million, or 2.9%, bank owned life insurance increased by $8.3 million, or 5.4%, operating lease right-of-use assets increased by $4.1 million, or 10.4%, goodwill (attributable to the Victory acquisition) increased by $3.2 million, or 8.3%, and other assets increased by $5.1 million, or 19.3%. Partially offsetting these increases was an increase in the allowance for loan losses of $10.0 million, or 34.9%, and a decrease in FHLBNY stock of $9.8 million, or 24.8%.
 
Cash and cash equivalents increased by $203.0 million, or 137.3%, to $350.8 million at September 30, 2020, from $147.8 million at December 31, 2019, primarily due to $72.9 million acquired from the Victory acquisition and organic growth in deposits. Balances fluctuate based on the timing of receipt of security and loan repayments and the redeployment of cash into higher-yielding assets such as loans and securities, or the funding of deposit outflows or borrowing maturities.
        
The Company’s available-for-sale debt securities portfolio increased by $33.1 million, or 2.9%, to $1.17 billion at September 30, 2020, from $1.14 billion at December 31, 2019. The increase was primarily attributable to $126.9 million of securities acquired from Victory, partially offset by paydowns, maturities, calls, and sales. At September 30, 2020, $1.07 billion of the portfolio consisted of residential mortgage-backed securities issued or guaranteed by Fannie Mae, Freddie Mac, or Ginnie Mae. In addition, the Company held $101.2 million in corporate bonds, all of which were considered investment grade at September 30, 2020, $3.2 million in U.S. government agency securities, $229,000 in municipal bonds, and $844,000 in other debt securities. The effective duration of the securities portfolio at September 30, 2020 was 1.23 years.

51
    As of September 30, 2020, our non-owner occupied commercial real estate concentration (as defined by regulatory guidance issued in 2006) to total risk-based capital was approximately 440.4%. Management believes that Northfield Bank (the "Bank") has implemented appropriate risk management practices including risk assessments, board-approved underwriting policies and related procedures which include monitoring Bank portfolio performance, performing market analysis (economic and real estate), and stressing of the Bank’s commercial real estate portfolio under severe, adverse economic conditions. Although management believes the Bank has implemented appropriate policies and procedures to manage our commercial real estate concentration risk, the Bank’s regulators could require us to implement additional policies and procedures or could require us to maintain higher levels of regulatory capital, which might adversely affect our loan originations, ability to pay dividends, and profitability.

    Loans held-for-investment, net, increased $294.5 million to $3.73 billion at September 30, 2020, from $3.44 billion at December 31, 2019, primarily due to an increase in originated loans held-for-investment of $228.4 million, and $180.4 million of loans acquired from the Victory acquisition, partially offset by paydowns. Originated loans held-for-investment, net, totaled $3.22 billion at September 30, 2020, as compared to $2.99 billion at December 31, 2019. The increase was primarily due to loans originated under the PPP authorized by the CARES Act, of $115.2 million, and an increase in multifamily real estate loans of $88.7 million. The PPP loans are administered by the Small Business Administration, which provides 100% federally guaranteed loans for small businesses to cover payroll, utilities, rent and interest. These small business loans may be forgiven if borrowers maintain their payrolls and satisfy certain other conditions for a period of time during the COVID-19 pandemic. As of September 30, 2020, we had originated over 1,000 loans, totaling approximately $118.5 million. PPP provides for lender processing fees that range from 1 to 5% of the final disbursement made to individual borrowers. As of September 30, 2020, we have received loan processing fees of $4.2 million, of which $787,000 has been recognized in earnings year to date and the remainder will be recognized in income over the remaining life of the loans. As part of the Victory acquisition, we acquired 395 PPP loans, totaling approximately $30.0 million, for which loan processing fees totaling $1.1 million have been received, of which $31,000 has been recognized in earnings through September 30, 2020.

    The following tables detail our multifamily real estate originations for the nine months ended September 30, 2020 and 2019 (in thousands):
For the Nine Months Ended September 30, 2020
Multifamily OriginationsWeighted Average Interest RateWeighted Average LTV RatioWeighted Average Months to Next Rate Change or Maturity for Fixed Rate Loans(F)ixed or (V)ariableAmortization Term
$309,209 3.61%60%88V25 to 30 Years
1,500 4.40%47%180F15 Years
$310,709 3.62%60%  
For the Nine Months Ended September 30, 2019
Multifamily OriginationsWeighted Average Interest RateWeighted Average LTV RatioWeighted Average Months to Next Rate Change or Maturity for Fixed Rate Loans(F)ixed or (V)ariableAmortization Term
$296,236 4.16%56%92V10 to 30 Years
36,178 4.36%55%241F10 to 30 Years
$332,414 4.18%56%  
    Acquired loans increased by $65.0 million to $497.6 million at September 30, 2020, from $432.7 million at December 31, 2019, primarily due to $180.4 million of loans acquired from Victory, partially offset by paydowns of primarily one-to-four family residential and multifamily loans.
    Purchased credit-impaired (“PCI”) loans totaled $18.5 million at September 30, 2020, as compared to $17.4 million at December 31, 2019. The increase was due to $3.8 million of PCI loans acquired as part of the Victory acquisition, partially offset by paydowns. The majority of the PCI loan balance consists of loans acquired as part of a Federal Deposit Insurance Corporation-assisted transaction. The Company accreted interest income of $648,000 and $2.2 million attributable to PCI loans for the three and nine months ended September 30, 2020, respectively, as compared to $1.1 million and $3.1 million for the three and nine months ended September 30, 2019, respectively.

Bank owned life insurance increased $8.3 million, or 5.4%, to $161.8 million at September 30, 2020, as compared to $153.5 million at December 31, 2019. The increase resulted from $5.7 million in policies added from the Victory acquisition and income earned on bank owned life insurance for the nine months ended September 30, 2020.  
    
52
Federal Home Loan Bank of New York (FHLBNY) stock decreased by $9.8 million, or 24.8%, to $29.8 million at September 30, 2020, from $39.6 million at December 31, 2019. The decrease in FHLBNY stock directly correlates with lower short-term borrowing balances at September 30, 2020, as compared to December 31, 2019.

    Total liabilities increased $472.0 million, or 10.8%, to $4.83 billion at September 30, 2020, from $4.36 billion at December 31, 2019. The increase was primarily attributable to an increase in deposits of $712.9 million, partially offset by a decrease in other borrowings of $240.1 million.
 
Deposits increased $712.9 million, or 20.9%, to $4.12 billion at September 30, 2020, as compared to $3.41 billion at December 31, 2019, due to both the Victory acquisition, which added $354.6 million to total deposits, as well as organic deposit growth. The increase was attributable to increases of $642.3 million in transaction accounts, $280.4 million in savings accounts, and $56.2 million in money market accounts, partially offset by a decrease of $266.0 million in certificates of deposit.

    Borrowings and securities sold under agreements to repurchase decreased to $616.9 million at September 30, 2020, from $857.0 million at December 31, 2019. Management utilizes borrowings to mitigate interest rate risk, for short-term liquidity, and to a lesser extent as part of leverage strategies. 

The following is a table of term borrowing maturities (excluding overnight borrowings and floating rate advances) and the weighted average rate by year at September 30, 2020 (in thousands):
YearAmountWeighted Average Rate
2020$25,0001.95%
2021170,0001.98%
2022120,0002.29%
202387,5002.89%
202450,0002.47%
Thereafter157,5001.47%
$610,0002.08%
    
    Total stockholders’ equity increased by $61.5 million to $757.4 million at September 30, 2020, from $695.9 million at December 31, 2019. The increase was primarily attributable to common stock issued for the purchase of Victory. The Company issued 3,862,746 shares of common stock in the Victory acquisition at a price of $10.73, which resulted in an increase in equity of $41.4 million. Additionally, there was a $9.7 million increase in accumulated other comprehensive income associated with unrealized gains on our debt securities available-for-sale portfolio, net income of $23.9 million for the nine months ended September 30, 2020, and a $2.4 million increase in equity award activity. The increases were partially offset by $15.9 million in dividend payments.

Comparison of Operating Results for the Nine Months Ended September 30, 2020 and 2019
 
    Net income was $23.9 million and $30.1 million for the nine months ended September 30, 2020 and September 30, 2019, respectively. Significant variances from the comparable prior year period are as follows: a $9.5 million increase in net interest income, an $11.0 million increase in the provision for loan losses, a $3.2 million decrease in non-interest income, a $2.5 million increase in non-interest expense, and a $1.1 million decrease in income tax expense.

    Interest Income. Interest income increased $2.6 million, or 2.1%, to $125.1 million for the nine months ended September 30, 2020, from $122.5 million for the nine months ended September 30, 2019, due to an increase in the average balance of interest-earning assets of $576.2 million, or 13.4%. The increase was due primarily to increases in average loans outstanding of $324.4 million and average mortgage-backed securities of $247.7 million, due to organic loan growth as well as the Victory acquisition. Partially offsetting the increase in the average balance of interest-earning assets was a 38 basis point decrease in the yields earned on interest-earning assets to 3.42% for the nine months ended September 30, 2020, from 3.80% for the comparative prior year period. The decrease in earning asset yields was due to decreases in market interest rates coupled with PPP loan originations, which have lower yields than other loans. The Company accreted interest income related to its PCI loans of $2.2 million and $3.1 million for the nine months ended September 30, 2020, and September 30, 2019, respectively. Interest income for the nine months ended September 30, 2020, included loan prepayment income of $1.1 million as compared to $1.2 million for the nine months ended September 30, 2019. Also included in net interest income for the nine months ended September 30, 2019, was $314,000 of interest income recorded on the pay-off of a non-accrual loan.

53
    Interest Expense. Interest expense decreased $6.9 million, or 17.5%, to $32.3 million for the nine months ended September 30, 2020, as compared to $39.2 million for the nine months ended September 30, 2019. The decrease was due to a decrease in interest expense on deposits of $8.9 million, or 28.5%, partially offset by an increase in interest expense on borrowings of $2.0 million, or 26.0%. The decrease in interest expense on deposits was attributable to a 50 basis point decrease in the cost of interest-bearing deposits to 0.92% for the nine months ended September 30, 2020, partially offset by a $292.6 million, or 9.9%, increase in the average balance of interest-bearing deposit accounts, due to the Victory acquisition as well as organic deposit growth. The decrease in the cost of interest-bearing deposits was primarily due to the Federal Reserve's reductions in the targeted federal funds rate. The increase in interest expense on borrowings was attributable to a $148.9 million, or 29.3%, increase in average borrowings, partially offset by a five basis point decrease in the cost of borrowings to 2.02% for the nine months ended September 30, 2020.
    Net Interest Income.  Net interest income for the nine months ended September 30, 2020, increased $9.5 million, or 11.4%, to $92.8 million, from $83.3 million for the nine months ended September 30, 2019, primarily due to a $576.2 million, or 13.4%, increase in our average interest-earning assets, partially offset by a four basis point decrease in our net interest margin to 2.54% from 2.58% for the nine months ended September 30, 2019. The increase in our average interest-earning assets was due to increases in average loans outstanding of $324.4 million, average mortgage-backed securities of $247.7 million, average interest-earning deposits in financial institutions of $90.0 million, and average FHLBNY stock of $4.6 million, partially offset by decreases in average other securities of $90.5 million. The decrease in net interest margin was due to the lower interest rate environment, the origination of lower yielding PPP loans, and excess balance sheet liquidity. Yields on interest earning assets decreased 38 basis points to 3.42% for the nine months ended September 30, 2020, from 3.80% for the nine months ended September 30, 2019. The cost of interest bearing liabilities decreased by 41 basis points to 1.11% for the nine months ended September 30, 2020, from 1.52% for the nine months ended September 30, 2019, driven by lower cost of deposits and borrowed funds. Net interest margin for the nine months ended September 30, 2020, was negatively impacted by 4 basis points as a result of excess liquidity on our balance sheet.
 
    Provision for Loan Losses. The provision for loan losses increased by $11.0 million to $10.3 million for the nine months ended September 30, 2020, compared to a negative provision of $750,000 for the nine months ended September 30, 2019. The increase in the provision for loan losses was primarily due to increases in the qualitative factors used in determining the adequacy of the allowance for loan losses related to unemployment, loan risk rating changes, and increased risks related to loans in forbearance resulting from economic uncertainty attributable to the COVID-19 pandemic. Year-over-year loan growth also contributed to the increase in the provision. The 2019 negative provision resulted from a $1.8 million recovery on a loan previously charged-off. Net charge-offs were $260,000 for the nine months ended September 30, 2020, as compared to net recoveries of $1.3 million for the quarter ended September 30, 2019, respectively.
    
    Non-interest Income. Non-interest income decreased $3.2 million, or 30.6%, to $7.4 million for the nine months ended September 30, 2020, from $10.6 million for the nine months ended September 30, 2019, primarily due to decreases of: (i) $838,000 in fees and service charges for customer services, related to fees waived due to the COVID-19 pandemic, as well as a decline in overdrafts due to lower consumer spending; (ii) $2.4 million in income on bank owned life insurance, attributable to insurance proceeds in excess of the related cash surrender value of the policies received in the quarter ended September 30, 2019; and (iii) $1.1 million in gains on trading securities, net. For the nine months ended September 30, 2020, gains on trading securities were $397,000 as compared to gains of $1.5 million for the nine months ended September 30, 2019. The trading portfolio is utilized to fund the Company’s deferred compensation obligation to certain employees and directors of the Company's deferred compensation plan (the “Plan”). The participants of this Plan, at their election, defer a portion of their compensation. Gains and losses on trading securities have no effect on net income since participants benefit from, and bear the full risk of, changes in the trading securities market values. Therefore, the Company records an equal and offsetting amount in compensation expense, reflecting the change in the Company’s obligations under the Plan. Partially offsetting the decreases were a $665,000 gain on the sale of a portfolio of $47.5 million in multifamily loans and an increase in other income of $657,000, primarily attributable to an increase in swap fee income.
        
    Non-interest Expense. Non-interest expense increased $2.5 million, or 4.6%, to $57.3 million for the nine months ended September 30, 2020, compared to $54.8 million for the nine months ended September 30, 2019. This was due primarily to a $1.1 million increase in employee compensation and benefits, related to change-in-control and severance compensation associated with the Victory acquisition, increased salary and benefit expenses due to the addition of Victory personnel, and increased medical benefit costs. Partially offsetting the increase was a decrease in expense related to the Company's deferred compensation plan, which is described above and has no effect on net income, and a decrease in equity award expense related to equity awards that fully vested in June 2019. Additionally there was an increase in data processing costs of $1.9 million, $1.3 million of which relates to a contract termination penalty associated with the completion of Victory's core systems conversion, and an increase in professional fees of $874,000, primarily merger-related costs. Partially offsetting the increases was a $1.3 million decrease in advertising expense, due to fewer marketing campaigns in 2020, and a $651,000 decrease in other non-
54
interest expense, primarily related to a decrease in directors' equity award expense associated with awards that fully vested in June 2019.

    Income Tax Expense. The Company recorded income tax expense of $8.6 million for the nine months ended September 30, 2020, compared to $9.7 million for the nine months ended September 30, 2019. The effective tax rate for the nine months ended September 30, 2020, was 26.5% compared to 24.4% for the nine months ended September 30, 2019. The higher effective tax rate for the nine months ended September 30, 2020, was primarily attributable to lower tax exempt income of $2.4 million from bank owned life insurance proceeds in excess of the cash surrender value of the policies received in the comparative prior year period, and non-deductible merger-related expenses for the nine months ended September 30, 2020.
    
    The following table sets forth average balances, average yields and costs, and certain other information for the periods indicated.
 For the Nine Months Ended
 September 30, 2020September 30, 2019
 Average Outstanding BalanceInterest
Average Yield/ Rate (1)
Average Outstanding BalanceInterest
Average Yield/ Rate (1)
Interest-earning assets:      
Loans (2)
$3,594,409 $107,705 4.00 %$3,269,983 $101,183 4.14 %
Mortgage-backed securities (3)
973,564 13,348 1.83 725,879 14,082 2.59 
Other securities (3)
136,840 2,342 2.29 227,318 5,075 2.98 
Federal Home Loan Bank of New York stock30,167 1,443 6.39 25,587 1,138 5.95 
Interest-earning deposits in financial institutions153,251 262 0.23 63,261 1,028 2.17 
Total interest-earning assets4,888,231 125,100 3.42 4,312,028 122,506 3.80 
Non-interest-earning assets285,787 296,043 
Total assets$5,174,018 $4,608,071 
Interest-bearing liabilities:
Savings, NOW, and money market accounts$2,229,601 $8,990 0.54 %$1,906,047 $15,452 1.08 %
Certificates of deposit1,008,373 13,405 1.78 1,039,344 15,860 2.04 
Total interest-bearing deposits3,237,974 22,395 0.92 2,945,391 31,312 1.42 
Borrowed funds657,098 9,934 2.02 508,176 7,885 2.07 
Total interest-bearing liabilities$3,895,072 32,329 1.11 $3,453,567 39,197 1.52 
Non-interest bearing deposits467,243 382,686  
Accrued expenses and other liabilities92,820 92,122   
Total liabilities4,455,135 3,928,375   
Stockholders' equity718,883 679,696   
Total liabilities and stockholders' equity$5,174,018 $4,608,071   
Net interest income$92,771  $83,309  
Net interest rate spread (4)
2.31 %  2.28 %
Net interest-earning assets (5)
$993,159 $858,461  
Net interest margin (6)
2.54 %  2.58 %
Average interest-earning assets to interest-bearing liabilities125.50 %  124.86 %

(1)    Average yields and rates are annualized.
(2)     Includes non-accruing loans.
(3)     Securities available-for-sale and other securities are reported at amortized cost.
(4)     Net interest rate spread represents the difference between the weighted average yield on interest-earning assets and the weighted average cost of interest-bearing liabilities.
(5)     Net interest-earning assets represent total interest-earning assets less total interest-bearing liabilities.
(6)    Net interest margin represents net interest income divided by average total interest-earning assets.

55
Comparison of Operating Results for the Three Months Ended September 30, 2020 and 2019
 
    Net Income. Net income was $8.6 million and $13.1 million for the quarters ended September 30, 2020, and September 30, 2019, respectively. Significant variances from the comparable prior year quarter are as follows: a $3.8 million increase in net interest income, a $1.5 million increase in the provision for loan losses, a $1.7 million decrease in non-interest income, a $6.9 million increase in non-interest expense, and a $1.8 million decrease in income tax expense.
    Interest Income. Interest income decreased $1.4 million, or 3.2%, to $41.5 million for the quarter ended September 30, 2020, from $42.8 million for the quarter September 30, 2019, primarily due to a 64 basis point decrease in the yields earned on interest-earning assets to 3.18% for the quarter ended September 30, 2020, from 3.82% for the comparable prior year quarter, partially offset by an increase in the average balance of interest-earning assets of $731.2 million, or 16.4%. The increase in average interest-earning assets was due primarily to increases in average loans outstanding of $392.8 million, average mortgage-backed securities of $218.5 million, and average interest-earning deposits in financial institutions of $202.5 million, due to the Victory acquisition and organic growth in loans and deposits. The decrease in earning asset yields was due to decreases in market interest rates coupled with PPP loan originations which have lower yields than other loans. The Company accreted interest income related to its PCI loans of $648,000 and $1.1 million for the quarters ended September 30, 2020, and September 30, 2019, respectively. Interest income on loans for the quarter ended September 30, 2020, included loan prepayment income of $91,000, as compared to $596,000 for the quarter ended September 30, 2019. Also included in net interest income for the quarter ended September 30, 2019, was $314,000 of interest income recorded on the pay-off of a non-accrual loan.

    Interest Expense. Interest expense decreased $5.2 million, or 36.9%, to $8.8 million for the quarter ended September 30, 2020, from $14.0 million for the quarter ended September 30, 2019. The decrease was due to a decrease in interest expense on deposits of $4.9 million, or 46.3%, and a decrease in interest expense on borrowings of $305,000, or 8.7%. The decrease in interest expense on deposits was attributable to a 77 basis point decrease in the cost of interest-bearing deposits to 0.65% for the quarter ended September 30, 2020, partially offset by a $492.2 million, or 16.7%, increase in the average balance of interest-bearing deposit accounts due to the Victory acquisition as well as organic deposit growth. The decreases are reflective of the lower interest rate environment attributable to the Federal Reserve's reductions in the targeted federal funds rate.
    Net Interest Income. Net interest income for the quarter ended September 30, 2020, increased $3.8 million, or 13.1%, primarily due to a $731.2 million, or 16.4%, increase in average interest-earning assets, partially offset by a seven basis point decrease in our net interest margin to 2.50% from 2.57% for the quarter ended September 30, 2019. The increase in average interest-earning assets was due to increases in average loans outstanding of $392.8 million, average mortgage-backed securities of $218.5 million, and average interest-earning deposits in financial institutions of $202.5 million, partially offset by a decrease of $82.4 million in average other securities. The decrease in net interest margin was due to lower yields on interest-earning assets, due to the lower interest rate environment, the origination of lower yielding PPP loans, and excess balance sheet liquidity. Yields on interest earning assets decreased 64 basis points to 3.18% for the quarter ended September 30, 2020, from 3.82% for the quarter ended September 30, 2019. The cost of interest-bearing liabilities decreased 68 basis points to 0.87% for the quarter ended September 30, 2020, from 1.55% for the quarter ended September 30, 2019, driven by lower cost of deposits and borrowed funds. Net interest margin for the quarter ended September 30, 2020, was negatively impacted by 10 basis points as a result of excess liquidity on our balance sheet.
   
    Provision for Loan Losses. The provision for loan losses increased by $1.5 million to $165,000 for the quarter ended September 30, 2020, from a negative provision of $1.3 million for the quarter ended September 30, 2019. The increase was primarily due to increases in the qualitative factors used in determining the adequacy of the allowance for loan losses related to unemployment, loan risk rating changes, and increased risks related to loans in forbearance, resulting from economic uncertainty attributable to the COVID-19 pandemic. Year-over-year loan growth also contributed to the increase in the provision. The 2019 negative provision resulted from a $1.8 million recovery on a loan previously charged-off. Net recoveries were $31,000 for the quarter ended September 30, 2020, compared to net recoveries of $1.5 million for the quarter ended September 30, 2019.

    Non-interest Income. Non-interest income decreased $1.7 million, or 36.1%, to $3.0 million for the quarter ended September 30, 2020, from $4.7 million for the quarter ended September 30, 2019, primarily due to a decrease in income on bank owned life insurance of $2.4 million, attributable to insurance proceeds in excess of the related cash surrender values of the policies received in the quarter ended September 30, 2019, partially offset by an increase of $735,000 in gains on trading securities, net. For the quarter ended September 30, 2020, gains on trading securities, net, included gains of $763,000 related to the Company’s trading portfolio, compared to gains of $28,000 in the comparative prior year quarter. The trading portfolio is utilized to fund the Company’s deferred compensation obligation to certain employees and directors of the Company's deferred
56
compensation plan, and gains and losses on trading securities have no effect on net income since participants benefit from, and bear the full risk of, changes in the trading securities market values.
    
Non-interest Expense. Non-interest expense increased by $6.9 million, or 41.0%, to $23.8 million for the quarter ended September 30, 2020, from $16.9 million for the quarter ended September 30, 2019. The increase was due primarily to an increase of $4.3 million in compensation and employee benefits, related to change-in-control and severance compensation associated with the Victory acquisition, increased salary and benefit expenses due to the addition of Victory personnel, increased medical benefit costs and an increase in expense related to the Company's deferred compensation plan, which has no effect on net income. Additionally, there was a $1.5 million increase in data processing costs, $1.3 million of which relates to a contract termination penalty associated with the completion of Victory's core systems conversion, a $456,000 increase in occupancy expense associated with additional branches from the Victory acquisition, a $355,000 increase in FDIC insurance premiums, and a $278,000 increase in professional fees, primarily merger-related expenses.
 
    Income Tax Expense. The Company recorded income tax expense of $3.1 million for the quarter ended September 30, 2020, compared to $4.8 million for the quarter ended September 30, 2019. The effective tax rate for the quarter ended September 30, 2020, was 26.5% compared to 26.9% for the quarter ended September 30, 2019.

57
    The following table sets forth average balances, average yields and costs, and certain other information for the periods indicated.                
ANALYSIS OF NET INTEREST INCOME
(Dollars in thousands)
 For the Three Months Ended
 September 30, 2020September 30, 2019
 Average Outstanding BalanceInterest
Average Yield/ Rate (1)
Average Outstanding BalanceInterest
Average Yield/ Rate (1)
Interest-earning assets:      
Loans (2)
$3,722,678 $37,025 3.96 %$3,329,893 $35,285 4.20 %
Mortgage-backed securities (3)
1,051,606 3,422 1.29 833,071 5,409 2.58 
Other securities (3)
125,749 541 1.71 208,196 1,511 2.88 
Federal Home Loan Bank of New York stock29,762 410 5.48 29,974 396 5.24 
Interest-earning deposits in financial institutions251,331 59 0.09 48,841 246 2.00 
Total interest-earning assets5,181,126 41,457 3.18 4,449,975 42,847 3.82 
Non-interest-earning assets267,131   303,406   
Total assets$5,448,257   $4,753,381   
Interest-bearing liabilities:      
Savings, NOW, and money market accounts$2,550,988 $2,023 0.32 %$1,940,764 $5,281 1.08 %
Certificates of deposit889,110 3,620 1.62 1,007,163 5,235 2.06 
Total interest-bearing deposits3,440,098 5,643 0.65 2,947,927 10,516 1.42 
Borrowed funds617,150 3,206 2.07 643,280 3,511 2.17 
Total interest-bearing liabilities4,057,248 8,849 0.87 3,591,207 14,027 1.55 
Non-interest bearing deposits553,654 382,563   
Accrued expenses and other liabilities93,368 93,143   
Total liabilities4,704,270 4,066,913   
Stockholders' equity743,987 686,468   
Total liabilities and stockholders' equity$5,448,257 $4,753,381   
Net interest income $32,608   $28,820  
Net interest rate spread (4)
  2.32 %  2.27 %
Net interest-earning assets (5)
$1,123,878   $858,768  
Net interest margin (6)
  2.50 %  2.57 %
Average interest-earning assets to interest-bearing liabilities  127.70 %  123.91 %
(1)Average yields and rates are annualized.
(2)Includes non-accruing loans.
(3)Securities available-for-sale are reported at amortized cost.
(4)Net interest rate spread represents the difference between the weighted average yield on interest-earning assets and the weighted average cost of interest-bearing liabilities.
(5)Net interest-earning assets represent total interest-earning assets less total interest-bearing liabilities.
(6)Net interest margin represents net interest income divided by average total interest-earning assets.

58
Asset Quality
 
    Purchased Credit Impaired Loans
    
PCI loans are recorded at estimated fair value using discounted expected future cash flows deemed to be collectible on the date acquired. Based on its detailed review of PCI loans and experience in loan workouts, management believes it has a reasonable expectation about the amount and timing of future cash flows and accordingly has classified PCI loans ($18.5 million at September 30, 2020 and $17.4 million at December 31, 2019) as accruing, even though they may be contractually past due. At September 30, 2020, 20.0% of PCI loans were past due 30 to 89 days, and 42.6% were past due 90 days or more, as compared to 20.9% and 24.3%, respectively, at December 31, 2019, the increase being primarily due to PCI loans acquired as part for the Victory acquisition.
 
    Originated and Acquired loans
 
    The following table details total originated and acquired (including held-for-sale, but excluding PCI) non-accruing loans, non-performing loans, non-performing assets, troubled debt restructurings (TDRs) on which interest is accruing, and accruing loans 30 to 89 days delinquent at September 30, 2020, and December 31, 2019 ( in thousands):  
 September 30, 2020December 31, 2019
Non-accrual loans: 
Held-for-investment
Real estate loans: 
Commercial$7,053 $7,922 
One-to-four family residential919 889 
Multifamily717 437 
Home equity and lines of credit178 185 
Total non-accrual loans 8,867 9,433 
Loans delinquent 90 days or more and still accruing: 
Held-for-investment
Real estate loans: 
Commercial401 253 
One-to-four family residential1,160 265 
Multifamily485 — 
Home equity and lines of credit14 — 
Other3 — 
Total loans delinquent 90 days or more and still accruing2,063 518 
Total non-performing assets$10,930 $9,951 
Non-performing loans to total loans0.30 %0.29 %
Non-performing assets to total assets0.20 %0.20 %
Loans subject to restructuring agreements and still accruing$12,941 $14,143 
Accruing loans 30 to 89 days delinquent$11,712 $8,206 
    
Accruing Loans 30 to 89 Days Delinquent
 
    Loans 30 to 89 days delinquent and on accrual status totaled $11.7 million and $8.2 million at September 30, 2020 and December 31, 2019, respectively. The following table sets forth delinquencies for accruing loans by type and by amount at
59
September 30, 2020 and December 31, 2019 (in thousands):     
 September 30, 2020December 31, 2019
Held-for-investment
Real estate loans:
Commercial$8,447 $5,450 
One-to-four family residential905 1,590 
Multifamily901 547 
Construction and land— 147 
Home equity and lines of credit427 217 
Commercial and industrial loans1,022 229 
Other loans10 26 
Total delinquent accruing loans $11,712 $8,206 
    
The increase in accruing loans 30 to 89 days delinquent from December 31, 2019, was primarily due to an increase in delinquencies associated with a deterioration of economic conditions caused by the COVID-19 pandemic in the commercial real estate and commercial and industrial portfolios. Included in commercial real estate loans at September 30, 2020, are four loans totaling $5.6 million which were modified for COVID-19 relief and being considered for an extension of relief.

Loans Subject to TDR Agreements
 
    Included in non-accruing loans are loans subject to TDR agreements totaling $3.8 million and $4.4 million at September 30, 2020 and December 31, 2019, respectively. The decrease in non-accruing TDR loans was primarily due to one loan with a balance of $1.3 million, settled in full during the quarter ended March 31, 2020. There were four loans modified as TDRs during the nine months ended September 30, 2020, totaling $730,000, where the borrowers have requested relief due to COVID-19 related challenges. All four loans were delinquent and on non-accrual status prior to the implementation of our COVID-19 customer relief program. At December 31, 2019, two of the non-accruing troubled debt restructurings totaling $255,000 were not performing in accordance with their restructured terms, and were collateralized by real estate with an aggregate estimated fair value of $946,000.

    The Company also holds loans subject to TDR agreements that are on accrual status totaling $12.9 million and $14.1 million at September 30, 2020 and December 31, 2019, respectively. At September 30, 2020, $7.0 million, or 53.7%, of the $12.9 million of accruing loans subject to TDR agreements were performing in accordance with their restructured terms. At December 31, 2019, $13.8 million, or 97.3%, of the $14.1 million of accruing loans subject to TDR agreements were performing in accordance with their restructured terms. Generally, the types of concessions that we make to troubled borrowers include both temporary and permanent reductions to interest rates, extensions of payment terms, and, to a lesser extent, forgiveness of principal and interest. 

    The following table details the amounts and categories of the loans subject to restructuring agreements by loan type as of September 30, 2020 and December 31, 2019 (in thousands): 
September 30, 2020December 31, 2019
Non-AccruingAccruingNon-AccruingAccruing
Real estate loans:
Commercial$3,306 $10,586 $4,102 $10,810 
One-to-four family residential421 1,623 255 2,224 
Multifamily39 629 40 997 
Home equity and lines of credit— 49 — 54 
Commercial and industrial loans— 54 — 58 
$3,766 $12,941 $4,397 $14,143 
Performing in accordance with restructured terms85.6 %53.7 %64.5 %97.3 %
    
60
Management continues to evaluate the Company's exposure to increased loan losses related to the COVID-19 pandemic, in particular the commercial real estate and multifamily loan portfolios. During the second quarter of 2020, the Company implemented a customer relief program to assist borrowers that may be experiencing financial hardship due to COVID-19 related challenges. The relief program grants principal and/or interest payment deferrals typically for a period of 90 days, which management may choose to extend for an additional 90 days, for a maximum of 180 days on a cumulative and successive basis. At the peak of forbearance, the Company had 288 loans (including four loans acquired as part of the Victory acquisition totaling $8.4 million) approved for payment deferral of approximately $368 million, or 10%, of the Company's total loan portfolio. As of September 30, 2020, the Company had approximately $105.6 million, or 85 loans (excluding PCI loans), remaining in deferral, representing approximately 2.8% of the Company’s outstanding loan portfolio (excluding PCI loans) as of that date. Loans currently in deferment status (“COVID-19 Modified Loans”) will continue to accrue interest during the deferment period unless otherwise classified as nonperforming. COVID-19 Modified Loans are required to make escrow payments for real estate taxes and insurance, if applicable. The COVID-19 Modified Loan agreements also require loans to be brought back to their fully contractual terms within 12 to 18 months and include covenants that prohibit distributions, bonuses, or payments of management fees to related entities until all deferred payments are made. Consistent with industry regulatory guidance, borrowers that were otherwise current on loan payments that were granted COVID-19 related financial hardship payment deferrals will continue to be reported as current loans throughout the agreed upon deferral period. Borrowers, which were delinquent in their payments to the Bank, prior to requesting a COVID-19 related financial hardship payment deferral are reviewed on a case by case basis for TDR classification and non-performing loan status.

    

61
The following table sets forth the property types collateralizing our originated and acquired (excluding PCI) loans and loans in forbearance as of September 30, 2020 (dollars in thousands):
Loan Portfolio by Property Type at September 30, 2020
Loans in Forbearance for COVID Relief as of September 30, 2020
Number of LoansAmount Average Loan SizeWeighted Average LTV Ratio% of Total Loans Number of LoansAmount Average Loan SizeWeighted Average LTV Ratio% of Portfolio by Property Type
Commercial Real Estate and Multifamily
Multifamily(1)
1,064$2,379,329 $2,236 54 %64.1 %12$24,148 $2,012 56 %1.0 %
Mixed use (majority of space is non-residential) 238161,944 680 46 %4.4 %1512,738 849 50 %7.9 %
Retail 94155,299 1,652 48 %4.2 %1120,387 1,853 45 %13.1 %
Office buildings 117113,690 972 46 %3.1 %2897 449 36 %0.8 %
Accommodations 1470,908 5,065 38 %1.9 %934,344 3,816 32 %48.4 %
Nursing Home527,822 5,564 58 %0.7 %—— — — %— %
Medical Office Buildings2427,397 1,142 64 %0.7 %—— — — %— %
Industrial and Manufacturing (Office and Plant)2319,167 833 45 %0.5 %—— — — %— %
Warehousing 3125,179 812 47 %0.7 %—— — — %— %
Restaurant 2513,516 541 52 %0.4 %62,026 338 45 %15.0 %
Religious1711,050 650 39 %0.3 %—— — — %— %
Bank Branch86,724 841 46 %0.2 %—— — — %— %
Schools/Child Day care65,747 958 37 %0.2 %—— — — %— %
Automobile196,933 365 53 %0.2 %—— — — %— %
Funeral Home32,736 912 66 %0.1 %—— — — %— %
Leisure44,185 1,046 49 %0.1 %179 — 7 %1.9 %
Car Wash31,215 405 38 %— %—— — — %— %
Other 11368,431 606 54 %1.7 %47,227 1,807 44 %10.6 %
Total commercial real estate and multifamily1,8083,101,272 1,715 53 %83.5 %60101,846 1,697 44 %3.3 %
One-to-four family residential725222,578 307 55 %6.0 %41,033 258 62 %0.5 %
Home equity and lines of credit1,77198,550 56 48 %2.7 %4362 91 46 %0.4 %
Construction and land4878,941 1,645 40 %2.1 %—— — — %— %
Commercial and industrial loans2,173209,716 97 NM5.6 %172,359 139 NM1.1 %
Other1412,092 15 NM0.1 %—— — — %— %
Total loans (excluding PCI)6,666$3,713,149 557 100.0 %85$105,600 1,242 2.8 %
(1) Property type is apartment units equal or greater than five units.
62

As of November 5, 2020, loans reported in the table above were in the following status ($ in millions):

Number of LoansAmountPercentage of Total
Returned to contractual monthly payments45$38.0 36.0 %
In original 90-day forbearance622.7 21.5 %
In second 90-day forbearance1915.7 14.9 %
Forbearance has expired:
Delinquent less than 30 days23.7 3.5 %
Delinquent 30 days or more1325.5 24.1 %
85$105.6 100.0 %
Of the 15 loans for which forbearance has expired as of November 5, 2020, $22.2 million are loans secured by accommodations (hotels or motels), $3.9 million are loans secured by retail properties, and $2.0 million are loans secured by mixed-use properties (majority of space is non-residential), with the remainder being primarily multifamily properties.
63
Liquidity and Capital Resources
    Liquidity. The objective of our liquidity management is to ensure the availability of sufficient funds to meet financial commitments and to take advantage of lending and investment opportunities. The Bank manages liquidity in order to meet deposit withdrawals on demand or at contractual maturity, to repay borrowings as they mature, and to fund new loans and investments as opportunities arise.
    The Bank's primary sources of funds are deposits, principal and interest payments on loans and securities, borrowed funds, the proceeds from maturing securities and short-term investments, and to a lesser extent, proceeds from the sales of loans and securities and wholesale borrowings. The scheduled amortization of loans and securities, as well as proceeds from borrowed funds, are predictable sources of funds. Other funding sources, however, such as deposit inflows and loan prepayments are greatly influenced by market interest rates, economic conditions, and competition. The Bank is a member of the FHLBNY, which provides an additional source of short-term and long-term funding. The Bank also has short-term borrowing capabilities with the Federal Reserve Bank of New York. The Bank’s borrowed funds, excluding lease obligations, floating rate advances and overnight line of credit, were $610.0 million at September 30, 2020, and had a weighted average interest rate of 2.08%. A total of $195.0 million of these borrowings will mature in less than one year. Borrowed funds, excluding floating rate advances and overnight line of credit, were $851.0 million at December 31, 2019. The Bank has the ability to obtain additional funding from the FHLB of approximately $1.76 billion utilizing unencumbered securities of $597.0 million, loans of $1.16 billion, and encumbered securities of $1.6 million at September 30, 2020. Additionally, the Bank has remaining borrowing capacity utilizing encumbered securities through the FRB Discount Window of $35.5 million. The Bank expects to have sufficient funds available to meet current commitments in the normal course of business.

    Northfield Bancorp, Inc. (standalone) is a separate legal entity from the Bank and must provide for its own liquidity to pay dividends, repurchase its stock, and for other corporate purposes. Northfield Bancorp, Inc.'s primary source of liquidity is dividend payments from the Bank. At September 30, 2020, Northfield Bancorp, Inc. (standalone) had liquid assets of $37.6 million.

    Capital Resources. Federal regulations require federally insured depository institutions to meet several minimum capital standards: a common equity Tier 1 capital to risk-based assets ratio of 4.5%, a Tier 1 capital to risk-based assets ratio of 6.0%, a total capital to risk-based assets of 8.0%, and a 4.0% Tier 1 capital to total assets leverage ratio. In addition to establishing the minimum regulatory capital requirements, the regulations limit capital distributions and certain discretionary bonus payments to management if the institution does not hold a “capital conservation buffer” consisting of 2.5% of common equity Tier 1 capital to risk-weighted assets in addition to the amount necessary to meet its minimum risk-based capital requirements.
    
    As a result of the Economic Growth, Regulatory Relief, and Consumer Protection Act, the federal banking agencies developed a “Community Bank Leverage Ratio” (“CBLR”) (the ratio of a bank’s tangible equity capital to average total consolidated assets) for financial institutions with assets of less than $10 billion. A qualifying community bank that exceeds this ratio will be deemed to be in compliance with all other capital and leverage requirements, including the capital requirements to be considered “well capitalized” under Prompt Corrective Action statutes. The federal banking agencies approved 9% as the minimum capital for the CBLR. Effective March 31, 2020, a financial institution can elect to be subject to this new definition. Northfield Bank and Northfield Bancorp have elected to opt into the “CBLR” framework, beginning with the Call Reports filed for the first quarter of 2020. The CBLR replaced the risk-based and leverage capital requirements in the generally applicable capital rules. On April 6, 2020, the federal banking regulators, implementing the applicable provisions of the CARES Act, modified the CBLR framework so that the minimum CBLR will be 8% beginning in the second quarter and for the remainder of calendar year 2020, 8.5% for calendar year 2021, and 9% thereafter.

    At September 30, 2020, and December 31, 2019, as set forth in the following table, both Northfield Bank and Northfield Bancorp, Inc. exceeded all of the regulatory capital requirements to which they were subject at such dates.
    
    
64
Northfield BankNorthfield Bancorp, Inc.
For Capital Adequacy Purposes (1)
For Well Capitalized Under Prompt Corrective Action Provisions
As of September 30, 2020:
CBLR11.86%12.96%8.00%8.00%
As of December 31, 2019:
Common equity Tier 1 capital (to risk-weighted assets)14.99%16.35%4.50%6.50%
Tier 1 leverage 12.28%13.37%4.00%5.00%
Tier I capital (to risk-weighted assets)14.99%16.35%6.00%8.00%
Total capital (to risk-weighted assets)15.73%17.09%8.00%10.00%
(1) Includes capital conservation buffer at December 31, 2019. The CBLR does not include a capital conservation buffer.
Off-Balance Sheet Arrangements and Contractual Obligations
    In the normal course of operations, the Company engages in a variety of financial transactions that, in accordance with U.S. GAAP, are not recorded in the financial statements. These transactions primarily relate to lending commitments. These arrangements are not expected to have a material impact on the Company's results of operations or financial condition.
    The following table shows the contractual obligations of the Company by expected payment period as of September 30, 2020 (in thousands):
Contractual ObligationsTotalLess than One YearOne to less than Three YearsThree to less than Five YearsMore than Five Years
Borrowings$610,000 $195,000 $207,500 $162,500 $45,000 
Operating lease liabilities62,732 6,890 12,403 11,592 31,847 
Commitments to originate loans39,096 39,096 — — — 
Commitments to fund unused lines of credit149,826 149,826 — — — 
    
Commitments to fund unused lines of credit are agreements to lend additional funds to customers as long as there have been no violations of any of the conditions established in the agreements (original or restructured). Commitments to originate loans generally have a fixed expiration or other termination clauses, which may require payment of a fee. Since some of these loan commitments are expected to expire without being drawn upon, total commitments do not necessarily represent future cash requirements. At September 30, 2020, the reserve for commitments to fund unused lines of credit recorded in accrued expenses and other liabilities was $705,000.

    For further information regarding our off-balance sheet arrangements and contractual obligations, see "Management’s Discussion and Analysis of Financial Condition and Results of Operations" in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019.

Accounting Pronouncements Not Yet Adopted
    
    ASU No. 2020-04. On March 12, 2020, FASB issued ASU No. 2020-04, “Reference Rate Reform ("ASC 848"): Facilitation of the Effects of Reference Rate Reform on Financial Reporting”, which provides temporary optional guidance to ease the potential burden in accounting for reference rate reform. The ASU provides optional expedients and exceptions for applying generally accepted accounting principles to contract modifications and hedging relationships, subject to meeting certain criteria, that reference the London Inter-Bank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued. It is intended to help stakeholders during the global market-wide reference rate transition period. The guidance is effective for all entities as of March 12, 2020 through December 31, 2022. The Company is implementing a transition plan to identify and modify its loans and other financial instruments that are either directly or indirectly influenced by LIBOR. The Company is in the process of evaluating ASU No. 2020-04 and its impact on the Company’s transition away from LIBOR for its loan and other financial instruments, with no material expected impact on the Company's financial condition or results of operation at this time.

65
    ASU No. 2019-12. In December 2019, the FASB issued ASU No. 2019-12, “Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes.” ASU No. 2019-12 simplifies accounting for income taxes by removing specific technical exceptions in ASC 740 related to the incremental approach for intra-period tax allocation, the methodology for calculating income taxes in an interim period and the recognition for deferred tax liabilities for outside basis differences. ASU No. 2019-12 also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The amendments in this update are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. ASU No. 2019-12 is not expected to have a material impact on the Company’s financial condition or results of operations.
    
    ASU No. 2018-14. In August 2018, the FASB issued ASU No. 2018-14, “Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans.” This ASU makes minor changes to the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. ASU 2018-14 is effective for fiscal years ending after December 15, 2020, with early adoption permitted. As ASU 2018-14 only revises disclosure requirements, it will not have an impact on the Company’s financial condition or results of operations.
        
    ASU 2016-13. In June 2016, the FASB issued ASU No. 2016-13, “Financial Instruments - Credit Losses (Topic 326): “Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”). This guidance was subsequently amended by ASU No. 2019-04, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments”; ASU No. 2019-05, “Financial Instruments-Credit Losses (Topic 326): Targeted Transition Relief”; and ASU No. 2019-11, “Codification Improvements to Topic 326, Financial Instruments-Credit Losses”. ASU No. 2016-13 and its subsequent updates are collectively known as “CECL”. CECL replaces the current incurred loss impairment model that recognizes losses when a probable threshold is met with a requirement to recognize lifetime expected credit losses immediately when a financial asset is originated or purchased. For available-for-sale debt securities where fair value is less than cost, credit-related impairment would be recognized in an allowance for credit losses and adjusted in each subsequent period for changes in credit risk. CECL also expands the disclosure requirements regarding an entity’s assumptions, models, and methods for estimating the allowance for credit losses.

    ASU 2016-13 and its subsequent updates became effective for the Company on January 1, 2020. However, the CARES Act, which became law on March 27, 2020, included an option for financial institutions to delay the implementation of ASU 2016-13 until the earlier of the termination date of the national emergency concerning the COVID-19 pandemic or December 31, 2020. The Company has elected to delay its implementation of ASU 2016-13 and has calculated and recorded its provision for credit losses under the incurred loss model that existed prior to ASU 2016-13.

    Our CECL implementation process included assessment and documentation of governance and reporting processes and related internal controls; model development, documentation and validation; and the incorporation of qualitative adjustments for model limitations, among other things. We contracted with a third-party vendor to assist us in the application of CECL. ASU 2016-13 lists several credit loss methods that are acceptable such as a discounted cash flow method, loss-rate method and probability of default/loss given default (“PD/LGD”) method. The Company will utilize the PD/LGD methodology to estimate its allowance for loan losses.

    Our CECL model includes the following major items:
•a historical loss period, which represents a full economic credit cycle utilizing internal loss experience, as well as peer historical loss data;
•three economic scenarios - history continues, history moderately worsens, and history severely worsens;
•a reasonable and supportable forecast period of two years, based on management’s current review of macroeconomic factors and the reliability of extended economic forecasts based on forecast data from Moody's;
•a reversion period (after the reasonable and supportable forecast period) using a straight-line approach;
•expected prepayment rates based on our historical experience; and
•incorporation of qualitative factors not captured within the modeled results.

66
    CECL parallel comparisons were performed at September 30, 2020, and the Company expects that upon adoption of ASU 2016-13, with an effective retrospective date of January 1, 2020, the Company would increase its allowance for credit losses by approximately 15% to 25%, excluding any reclassification related to purchased credit-impaired loans. This increase will be reflected as a cumulative-effect adjustment that decreases beginning retained earnings, net of income taxes. The expected increase in the allowance for credit losses is a result of changing from an incurred loss model, which encompasses allowances for current known and inherent losses within the portfolio, to a CECL model, which encompasses allowances for losses expected to be incurred over the life of the portfolio. Furthermore, ASU 2016-13 necessitates that the Company establish an allowance for expected credit losses for certain debt securities and other financial assets; however, the Company does not expect to record any allowances on debt securities available-for sale. The adoption of ASU 2016-13 is not expected to have a significant impact on our regulatory capital ratios.

    See Note 14 of the Notes to the Unaudited Consolidated Financial Statements for information about recent accounting pronouncements adopted.
67
ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
    Management of Market Risk
    General.  A majority of our assets and liabilities are monetary in nature. Consequently, our most significant form of market risk is interest rate risk. Our assets, consisting primarily of mortgage-related securities and loans, generally have longer maturities than our liabilities, which consist primarily of deposits and wholesale borrowings. As a result, a principal part of our business strategy involves managing interest rate risk and limiting the exposure of our net interest income to changes in market interest rates. Accordingly, our Board of Directors has established a Management Asset-Liability Committee, comprised of our SVP & Chief Investment Officer and Treasurer, who chairs this Committee, our President and Chief Executive Officer, our EVP & Chief Risk Officer, EVP & Chief Financial Officer, EVP & Chief Lending Officer, EVP Branch Administration and Business Development, and SVP & Director of Marketing, and other officers and staff as necessary or appropriate. This committee is responsible for, among other things, evaluating the interest rate risk inherent in our assets and liabilities, for recommending to the risk management committee of our Board of Directors the level of risk that is appropriate given our business strategy, operating environment, capital, liquidity and performance objectives, and for managing this risk consistent with the guidelines approved by the Board of Directors.
 
    We seek to manage our interest rate risk in order to minimize the exposure of our earnings and capital to changes in interest rates. As part of our ongoing asset-liability management, we currently use the following strategies to manage our interest rate risk:

•originating multifamily loans and commercial real estate loans that generally have shorter maturities than one-to-four family residential real estate loans and have higher interest rates that generally reset from five to ten years;
•investing in investment grade corporate securities and mortgage-backed securities; and
•obtaining general financing through lower-cost core deposits, brokered deposits, and longer-term FHLB advances and repurchase agreements.
Shortening the average term of our interest-earning assets by increasing our investments in shorter-term assets, as well as originating loans with variable interest rates, helps to match the maturities and interest rates of our assets and liabilities better, thereby reducing the exposure of our net interest income to changes in market interest rates.
 
    Net Portfolio Value Analysis. We compute amounts by which the net present value of our assets and liabilities (net portfolio value or NPV) would change in the event market interest rates changed over an assumed range of rates. Our simulation model uses a discounted cash flow analysis to measure the interest rate sensitivity of our NPV. Depending on current market interest rates, we estimate the economic value of these assets and liabilities under the assumption that interest rates experience an instantaneous and sustained increase of 100, 200, 300, or 400 basis points, or a decrease of 100 and 200 basis points, which is based on the current interest rate environment. A basis point equals one-hundredth of one percent, and 100 basis points equals one percent. An increase in interest rates from 3% to 4% would mean, for example, a 100 basis point increase in the “Change in Interest Rates” column below. 
 
    Net Interest Income Analysis.  In addition to NPV calculations, we analyze our sensitivity to changes in interest rates through our net interest income model. Net interest income is the difference between the interest income we earn on our interest-earning assets, such as loans and securities, and the interest we pay on our interest-bearing liabilities, such as deposits and borrowings. In our model, we estimate what our net interest income would be for a twelve-month period. Depending on current market interest rates we then calculate what the net interest income would be for the same period under the assumption that interest rates experience an instantaneous and sustained increase or decrease of 100, 200, 300, or 400 basis points, or a decrease of 100 and 200 basis points, which is based on the current interest rate environment.

    The following tables set forth, as of September 30, 2020, and December 31, 2019, our calculation of the estimated changes in our NPV, NPV ratio, and percent change in net interest income that would result from the designated instantaneous and sustained changes in interest rates (dollars in thousands). Computations of prospective effects of hypothetical interest rate changes are based on numerous assumptions, including relative levels of market interest rates, loan prepayments and deposit repricing characteristics, including decay rates, and correlations to movements in interest rates, and should not be relied on as indicative of actual results.
68
 NPV at September 30, 2020
Change in Interest Rates (basis points)Estimated Present Value of AssetsEstimated Present Value of LiabilitiesEstimated NPVEstimated Change In NPVEstimated Change in NPV %Estimated NPV/Present Value of Assets RatioNext 12 Months Net Interest Income Percent ChangeMonths 13-24 Net Interest Income Percent Change
+400$5,205,041 $4,353,886 $851,155 $(19,316)(2.22)%16.35 %2.91 %22.48 %
+3005,301,003 4,450,793 850,210 (20,261)(2.33)16.04 2.45 17.29 
+2005,406,827 4,552,102 854,725 (15,746)(1.81)15.81 2.03 12.42 
+1005,516,440 4,658,587 857,853 (12,618)(1.45)15.55 1.25 6.79 
—5,641,421 4,770,950 870,471 — — 15.43 — — 
(100)5,801,436 4,865,522 935,914 65,443 7.52 16.13 (0.39)(2.78)
(200)5,973,370 4,866,168 1,107,202 236,731 27.20 18.54 (0.32)(2.91)
     
 NPV at December 31, 2019
Change in Interest Rates (basis points)Estimated Present Value of AssetsEstimated Present Value of LiabilitiesEstimated NPVEstimated Change In NPVEstimated Change in NPV %Estimated NPV/Present Value of Assets RatioNext 12 Months Net Interest Income Percent ChangeMonths 13-24 Net Interest Income Percent Change
+400$4,692,640 $3,974,209 $718,431 $(156,728)(17.91)%15.31 %(17.51)%(3.90)%
+3004,797,256 4,039,976 757,280 (117,879)(13.47)15.79 (12.79)(2.47)
+2004,907,606 4,108,235 799,371 (75,788)(8.66)16.29 (7.99)(0.70)
+1005,018,245 4,179,543 838,702 (36,457)(4.17)16.71 (3.71)0.42 
—5,129,680 4,254,521 875,159 — — 17.06 — — 
(100)5,249,067 4,339,402 909,665 34,506 3.94 17.33 0.36 (3.15)
(200)5,414,518 4,422,975 991,543 116,384 13.30 18.31 0.63 (4.18)
    At September 30, 2020, in the event of a 200 basis point decrease in interest rates, we would experience a 27.20% increase in estimated net portfolio value and a 0.32% decrease in net interest income in year one and a 2.91% decrease in net interest income in year two. In the event of a 400 basis point increase in interest rates, we would experience a 2.22% decrease in estimated net portfolio value and a 2.91% increase in net interest income in year one and an 22.48% increase in net interest income in year two. Our policies provide that, in the event of a 200 basis point decrease or less in interest rates, our net present value ratio should decrease by no more than 300 basis points and 10%, and in the event of a 400 basis point increase or less, our net present value should decrease by no more than 475 basis points and 35%. In the event of a 200 basis point decrease or less, our projected net interest income should decrease by no more than 10% in year one and 10% in year two, and in the event of a 400 basis point increase or less, our projected net interest income should decrease by no more than 30% in year one and 20% in year two. However, when the federal funds rate is low and negative rate shocks do not produce meaningful results, management may temporarily suspend use of guidelines for negative interest rate shocks. At September 30, 2020 and December 31, 2019, we were in compliance with all Board-approved policies with respect to interest rate risk management.
    Certain shortcomings are inherent in the methodologies used in determining interest rate risk through changes in net portfolio value and net interest income. Our model requires us to make certain assumptions that may or may not reflect the manner in which actual yields and costs respond to changes in market interest rates. However, we also apply consistent parallel yield curve shifts (in both directions) to determine possible changes in net interest income if the theoretical yield curve shifts occurred gradually. Net interest income analysis also adjusts the asset and liability repricing analysis based on changes in prepayment rates resulting from the parallel yield curve shifts. In addition, the net portfolio value and net interest income information presented assume that the composition of our interest-sensitive assets and liabilities existing at the beginning of a period remains constant over the period being measured and assume that a particular change in interest rates is reflected uniformly across the yield curve regardless of the duration or repricing of specific assets and liabilities. Accordingly, although interest rate risk calculations provide an indication of our interest rate risk exposure at a particular point in time, such measurements are not intended to and do not provide a precise forecast of the effect of changes in market interest rates on our net portfolio value or net interest income and will differ from actual results.
69
ITEM 4.    CONTROLS AND PROCEDURES 
An evaluation was performed under the supervision and with the participation of the Company’s management, including the President and Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) and 15d-15(e) promulgated under the Securities Exchange Act of 1934, as amended) as of September 30, 2020. Based on that evaluation, the Company’s management, including the President and Chief Executive Officer and the Chief Financial Officer, concluded that the Company’s disclosure controls and procedures were effective.
 
During the three months ended September 30, 2020, there were no changes in the Company’s internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.
70
PART II

ITEM 1.     LEGAL PROCEEDINGS
    The Company and subsidiaries are subject to various legal actions arising in the normal course of business.  In the opinion of management, the resolution of these legal actions is not expected to have a material adverse effect on the Company’s consolidated financial condition or results of operations.

ITEM 1A.  RISK FACTORS
    During the quarter ended September 30, 2020, there have been no material changes to the risk factors as previously disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019, and in our quarterly report on Form 10-Q for the quarter ended March 31, 2020, each as filed with the Securities and Exchange Commission, except as previously disclosed in our other filings with the Securities and Exchange Commission.

ITEM 2.     UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS
(a)Unregistered Sale of Equity Securities. There were no sales of unregistered securities during the period covered by this report.
(b)Use of Proceeds. Not applicable.
(c)Repurchases of Our Equity Securities.  

    The Company did not repurchase any of its common stock during the three months ended September 30, 2020. The previously adopted repurchase program permitted $37.2 million of shares of common stock to be repurchased in open market or private transactions, through block trades, and pursuant to any trading plan that may be adopted in accordance with Rule 10b5-1 of the Securities and Exchange Commission. The timing of the repurchases will depend on certain factors, including but not limited to, market conditions and prices, the Company’s liquidity and capital requirements, and alternative uses of capital. Any repurchased shares will be held as treasury stock and will be available for general corporate purposes. The repurchases may be suspended, terminated or modified at any time for any reason, including market conditions, the cost of repurchasing shares, the availability of alternative investment opportunities, liquidity, and other factors deemed appropriate. On April 29, 2020, the Company temporarily suspended its share repurchase program in light of the COVID-19 pandemic and surrounding events. On October 28, 2020, the Company announced the reinstatement of its repurchase plan with approximately 1.45 million shares remaining for repurchase.

ITEM 3.     DEFAULTS UPON SENIOR SECURITIES
    None

ITEM 4.     MINE SAFETY DISCLOSURES
    Not applicable

ITEM 5.     OTHER INFORMATION
    None

71
Table of Contents
ITEM 6.      EXHIBITS
    The following exhibits required by Item 601 of Regulation S-K are included with this Quarterly Report on Form 10-Q.
Exhibit NumberDescription
Transition Consulting Agreement with Michael J. Widmer, dated July 29, 2020 (Incorporated by reference to Northfield Bancorp Inc.’s Current Report on Form 8-K dated August 3, 2020 filed with the Securities and Exchange Commission on August 3, 2020 (File Number 001-35791).
Certification of Steven M. Klein, President and Chief Executive Officer, Pursuant to Rule 13a-14(a) and Rule 15d-14(a)
Certification of William R. Jacobs, Chief Financial Officer, Pursuant to Rule 13a-14(a) and Rule 15d-14(a)
Certification of Steven M. Klein, President and Chief Executive Officer, and William R. Jacobs, Chief Financial Officer, Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INSXBRL (Extensible Business Reporting Language) Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCHInline XBRL Taxonomy Extension Schema Document.
101.CALInline XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEFInline XBRL Taxonomy Extension Definition Linkbase Document.
101.LABInline XBRL Taxonomy Extension Label Linkbase Document.
101.PREInline XBRL Taxonomy Extension Presentation Linkbase Document.
104Cover page information from the Company's Quarterly Report on Form 10-Q filed November 9, 2020, formatted in Inline XBRL
72
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
 
 
NORTHFIELD BANCORP, INC.
(Registrant)
 
 
Date: November 9, 2020
/s/   Steven M. Klein
Steven M. Klein
President and Chief Executive Officer
 
/s/   William R. Jacobs
William R. Jacobs
Executive Vice President and Chief Financial Officer
(Principal Financial and Accounting Officer)
73

What is the market capitalization of a company?

The market capitalization sometimes referred as Marketcap, is the value of a publicly listed company.
In most cases it can be easily calculated by multiplying the share price with the amount of outstanding shares.

DISCLAIMER

CompaniesMarketCap is not associated in any way with CoinMarketCap.com
Stock prices are delayed, the delay can range from a few minutes to several hours.
Company logos are from the CompaniesLogo.com logo database and belong to their respective copyright holders. Companies Marketcap displays them for editorial purposes only.

Contact

For inquiries or if you want to report a problem write to hello@8marketcap.com

Links

- Privacy policy

- Terms and conditions

© 2025 CompaniesMarketcap.com