XML 59 R49.htm IDEA: XBRL DOCUMENT
v3.20.2

Loans - Summary of Impaired Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Recorded Investment |  |
With No Allowance Recorded | $ 12,900 | $ 15,900
Total | 19,881 | 20,957
Unpaid Principal Balance |  |
Total | 22,304 | 23,132
Related Allowance | (319) | (142)
Real Estate | Commercial |  |
Recorded Investment |  |
Total | 16,785 | 17,327
Unpaid Principal Balance |  |
Total | 18,614 | 18,916
Related Allowance | (307) | (135)
Real Estate | One-to-Four Family |  |
Recorded Investment |  |
Total | 2,318 | 2,479
Unpaid Principal Balance |  |
Total | 2,441 | 2,595
Related Allowance | (4) | 0
Real Estate | Multifamily |  |
Recorded Investment |  |
Total | 673 | 1,038
Unpaid Principal Balance |  |
Total | 1,144 | 1,508
Related Allowance | 0 | 0
Real Estate | Home Equity and Lines of Credit |  |
Recorded Investment |  |
Total | 51 | 55
Unpaid Principal Balance |  |
Total | 51 | 55
Related Allowance | (4) | (3)
Real Estate | Home Equity and Lines of Credit | Substandard |  |
Recorded Investment |  |
With a Related Allowance Recorded | 32 | 33
Unpaid Principal Balance |  |
With a Related Allowance Recorded | 32 | 33
Related Allowance | (4) | (3)
Real Estate | Home Equity and Lines of Credit | Pass |  |
Recorded Investment |  |
With No Allowance Recorded | 19 | 22
Unpaid Principal Balance |  |
With No Allowance Recorded | 19 | 22
Commercial and Industrial |  |
Recorded Investment |  |
Total | 54 | 58
Unpaid Principal Balance |  |
Total | 54 | 58
Related Allowance | (4) | (4)
Commercial and Industrial | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 37 | 39
Unpaid Principal Balance |  |
With No Allowance Recorded | 37 | 39
Commercial and Industrial | Special Mention |  |
Recorded Investment |  |
With a Related Allowance Recorded | 17 | 19
Unpaid Principal Balance |  |
With a Related Allowance Recorded | 17 | 19
Related Allowance | (4) | (4)
Less Than 35% LTV | Real Estate | Commercial | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 79 | 0
Unpaid Principal Balance |  |
With No Allowance Recorded | 218 | 139
Less Than 35% LTV | Real Estate | Multifamily | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 40 | 40
Unpaid Principal Balance |  |
With No Allowance Recorded | 40 | 40
Equal to or Greater than 35% LTV | Real Estate | Commercial | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 8,449 | 10,438
With a Related Allowance Recorded | 2,799 | 1,307
Unpaid Principal Balance |  |
With No Allowance Recorded | 8,655 | 11,002
With a Related Allowance Recorded | 3,397 | 1,307
Related Allowance | (288) | (135)
Equal to or Greater than 35% LTV | Real Estate | Commercial | Pass |  |
Recorded Investment |  |
With No Allowance Recorded | 3,629 | 5,582
With a Related Allowance Recorded | 1,318 | 0
Unpaid Principal Balance |  |
With No Allowance Recorded | 4,378 | 6,468
With a Related Allowance Recorded | 1,318 | 0
Related Allowance | (19) | 0
Equal to or Greater than 35% LTV | Real Estate | Commercial | Special Mention |  |
Recorded Investment |  |
With No Allowance Recorded | 511 | 0
Unpaid Principal Balance |  |
With No Allowance Recorded | 648 | 0
Equal to or Greater than 35% LTV | Real Estate | Multifamily | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 611 | 972
Unpaid Principal Balance |  |
With No Allowance Recorded | 611 | 972
Equal to or Greater than 35% LTV | Real Estate | Multifamily | Pass |  |
Recorded Investment |  |
With No Allowance Recorded | 0 | 26
Unpaid Principal Balance |  |
With No Allowance Recorded | 0 | 496
Equal to or Greater than 35% LTV | Real Estate | Multifamily | Special Mention |  |
Recorded Investment |  |
With No Allowance Recorded | 22 | 0
Unpaid Principal Balance |  |
With No Allowance Recorded | 493 | 0
Less Than 60% LTV | Real Estate | One-to-Four Family | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 218 | 564
With a Related Allowance Recorded | 522 | 0
Unpaid Principal Balance |  |
With No Allowance Recorded | 218 | 564
With a Related Allowance Recorded | 522 | 0
Related Allowance | (4) | 0
Less Than 60% LTV | Real Estate | One-to-Four Family | Pass |  |
Recorded Investment |  |
With No Allowance Recorded | 1,057 | 1,379
Unpaid Principal Balance |  |
With No Allowance Recorded | 1,145 | 1,463
Less Than 60% LTV | Real Estate | One-to-Four Family | Special Mention |  |
Recorded Investment |  |
With No Allowance Recorded | 378 | 385
Unpaid Principal Balance |  |
With No Allowance Recorded | 378 | 385
Equal to or Greater than 60% LTV | Real Estate | One-to-Four Family | Substandard |  |
Recorded Investment |  |
With No Allowance Recorded | 25 | 29
Unpaid Principal Balance |  |
With No Allowance Recorded | 25 | 29
Equal to or Greater than 60% LTV | Real Estate | One-to-Four Family | Pass |  |
Recorded Investment |  |
With No Allowance Recorded | 118 | 122
Unpaid Principal Balance |  |
With No Allowance Recorded | $ 153 | $ 154

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalanceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=nfbk_RealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nfbk_OneToFourFamilyResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=srt_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=nfbk_CommercialAndIndustrialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=nfbk_LessThan35LtvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=nfbk_EqualToOrGreaterThan35LtvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=nfbk_LessThan60LtvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanToValueAxis=nfbk_EqualToOrGreaterThan60LtvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |