$NFBK
Northfield Bancorp, Inc. Stock $nfbk

$nfbk Overview Financials Valuation SEC Filings Company Website

2022 Q3 Form 10-Q Financial Statement

#000149322522000083 Filed on August 08, 2022

Income Statement

Concept	2022 Q3	2022 Q2	2022 Q1
Revenue	$1.500M	$43.46M	$40.19M
YoY Change	-96.44%	0.51%	-10.81%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$935.0K	$951.0K	$999.0K
YoY Change	-8.33%	-7.67%	-2.06%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$5.267M	$3.371M	$3.325M
YoY Change	41.24%	-25.9%	-32.02%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$23.72M	$21.99M	$19.47M
YoY Change	7.07%	-19.85%	-24.01%
Income Tax	$6.745M	$6.114M	$5.343M
% Of Pretax Income	28.43%	27.81%	27.44%
Net Earnings	$16.98M	$15.87M	$14.13M
YoY Change	5.59%	-19.8%	-24.36%
Net Earnings / Revenue	1131.93%	36.53%	35.15%
Basic Earnings Per Share	$0.37	$0.34	$0.30
Diluted Earnings Per Share	$0.37	$0.34	$0.30
COMMON SHARES
Basic Shares Outstanding	48.41M shares	46.59M shares	46.81M shares
Diluted Shares Outstanding	46.24M shares	46.64M shares	47.09M shares

Balance Sheet

Concept	2022 Q3	2022 Q2	2022 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$70.67M	$110.2M	$135.5M
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$25.38M	$25.77M	$25.36M
YoY Change	-4.44%	-5.51%	-7.83%
Goodwill	$41.01M	$41.01M	$41.01M
YoY Change	0.0%	0.0%	-0.75%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$5.670B	$5.647B	$5.516B
YoY Change	5.03%	4.06%	-1.09%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$26.14M	$29.46M	$30.03M
YoY Change	11.22%	21.73%	25.13%
Accrued Expenses	$77.38M	$76.49M	$70.12M
YoY Change	7.17%	7.88%	-0.4%
Deferred Revenue
YoY Change
Short-Term Debt	$25.00M	$25.00M	$50.00M
YoY Change	-50.0%	-50.0%	-33.33%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$103.5M	$105.9M	$100.1M
YoY Change	8.17%	11.4%	6.09%
LONG-TERM LIABILITIES
Long-Term Debt	$443.6M	$382.9M	$347.9M
YoY Change	19.32%	-8.89%	-32.74%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$443.6M	$382.9M	$347.9M
YoY Change	19.32%	-8.89%	-32.74%
TOTAL LIABILITIES
Total Short-Term Liabilities	$103.5M	$105.9M	$100.1M
Total Long-Term Liabilities	$443.6M	$382.9M	$347.9M
Total Liabilities	$4.976B	$4.932B	$4.801B
YoY Change	6.81%	5.52%	-0.45%
SHAREHOLDERS EQUITY
Retained Earnings	$410.1M	$399.1M	$389.4M
YoY Change	10.43%	10.37%	11.82%
Common Stock	$648.0K	$648.0K	$648.0K
YoY Change	0.0%	0.0%	0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)			$222.7M
YoY Change			25.45%
Treasury Stock Shares			15.86M shares
Shareholders Equity	$693.3M	$715.3M	$715.4M
YoY Change
Total Liabilities & Shareholders Equity	$5.670B	$5.647B	$5.516B
YoY Change	5.03%	4.06%	-1.09%

Cashflow Statement

Concept	2022 Q3	2022 Q2	2022 Q1
OPERATING ACTIVITIES
Net Income	$16.98M	$15.87M	$14.13M
YoY Change	5.59%	-19.8%	-24.36%
Depreciation, Depletion And Amortization	$935.0K	$951.0K	$999.0K
YoY Change	-8.33%	-7.67%	-2.06%
Cash From Operating Activities	$17.98M	$20.79M	$19.60M
YoY Change	-2.35%	333.95%	-2.97%
INVESTING ACTIVITIES
Capital Expenditures	-$514.0K	-$1.321M	$365.0K
YoY Change	97.69%	78.51%	24.57%
Acquisitions
YoY Change
Other Investing Activities	-$83.24M	-$160.5M	-$75.46M
YoY Change	-1382.56%	-169.55%	160.11%
Cash From Investing Activities	-$83.75M	-$161.8M	-$75.82M
YoY Change	-1448.66%	-170.34%	158.79%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$8.237M
YoY Change			-18.69%
Debt Paid & Issued, Net			$25.00M
YoY Change
Cash From Financing Activities	26.21M	115.7M	$100.7M
YoY Change	-159.39%	-168.41%	104.92%
NET CHANGE
Cash From Operating Activities	17.98M	20.79M	$19.60M
Cash From Investing Activities	-83.75M	-161.8M	-$75.82M
Cash From Financing Activities	26.21M	115.7M	$100.7M
Net Change In Cash	-39.57M	-25.28M	$44.45M
YoY Change	102.8%	-138.53%	11.04%
FREE CASH FLOW
Cash From Operating Activities	$17.98M	$20.79M	$19.60M
Capital Expenditures	-$514.0K	-$1.321M	$365.0K
Free Cash Flow	$18.49M	$22.11M	$19.23M
YoY Change	-0.96%	299.76%	-3.38%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001493225
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2022
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q2
	dei	Amendment Flag AmendmentFlag	false
CY2020	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2022#AccountingStandardsUpdate201613Member
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2022-06-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-35791
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	80-0882592
	dei	Entity Registrant Name EntityRegistrantName	Northfield Bancorp, Inc.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Address Address Line1 EntityAddressAddressLine1	581 Main Street,
	dei	Entity Address City Or Town EntityAddressCityOrTown	Woodbridge,
	dei	Entity Address State Or Province EntityAddressStateOrProvince	NJ
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	07095
	dei	City Area Code CityAreaCode	732
	dei	Local Phone Number LocalPhoneNumber	499-7200
	dei	Security12b Title Security12bTitle	Common stock, par value $0.01 per share
	dei	Trading Symbol TradingSymbol	NFBK
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1687000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1705000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	0	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	509000	usd
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	264000	usd
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	606000	usd
CY2022Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-1563000	usd
CY2021Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	807000	usd
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-2365000	usd
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1171000	usd
CY2022Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
CY2021Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1401000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1401000	usd
CY2022Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	105000	usd
CY2021Q2	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	15000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	186000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	145000	usd
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	765000	usd
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	4916000	usd
	us-gaap	Noninterest Income NoninterestIncome	2478000	usd
	us-gaap	Noninterest Income NoninterestIncome	7552000	usd
CY2022Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	9418000	usd
CY2021Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	10806000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	18925000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	21338000	usd
CY2022Q2	us-gaap	Occupancy Net OccupancyNet	3286000	usd
CY2021Q2	us-gaap	Occupancy Net OccupancyNet	3500000	usd
	us-gaap	Occupancy Net OccupancyNet	6694000	usd
	us-gaap	Occupancy Net OccupancyNet	7201000	usd
CY2022Q2	us-gaap	Equipment Expense EquipmentExpense	426000	usd
	us-gaap	Equipment Expense EquipmentExpense	852000	usd
	us-gaap	Equipment Expense EquipmentExpense	879000	usd
CY2022Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1762000	usd
CY2021Q2	us-gaap	Equipment Expense EquipmentExpense	442000	usd
CY2021Q2	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1798000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3475000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3430000	usd
CY2022Q2	us-gaap	Professional Fees ProfessionalFees	1229000	usd
CY2021Q2	us-gaap	Professional Fees ProfessionalFees	832000	usd
	us-gaap	Professional Fees ProfessionalFees	2137000	usd
	us-gaap	Professional Fees ProfessionalFees	1738000	usd
CY2022Q2	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	404000	usd
CY2021Q2	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	684000	usd
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	837000	usd
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	1149000	usd
CY2022Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	355000	usd
CY2021Q2	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	346000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	712000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	721000	usd
CY2022Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1833000	usd
CY2021Q2	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1463000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3790000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2978000	usd
CY2022Q2	us-gaap	Noninterest Expense NoninterestExpense	18713000	usd
CY2021Q2	us-gaap	Noninterest Expense NoninterestExpense	19871000	usd
	us-gaap	Noninterest Expense NoninterestExpense	37422000	usd
	us-gaap	Noninterest Expense NoninterestExpense	39434000	usd
CY2022Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	21988000	usd
CY2021Q2	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	27433000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	41458000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	53056000	usd
CY2022Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6114000	usd
CY2021Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	7639000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	11457000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	14585000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15874000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	19794000	usd
	us-gaap	Net Income Loss NetIncomeLoss	30001000	usd
	us-gaap	Net Income Loss NetIncomeLoss	38471000	usd
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15874000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	19794000	usd
	us-gaap	Net Income Loss NetIncomeLoss	30001000	usd
	us-gaap	Net Income Loss NetIncomeLoss	38471000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-11079000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-2006000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-45973000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-3150000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	0	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	509000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	264000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	606000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-11079000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-2515000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-46237000	usd
	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Before Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax	-3756000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	0	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	0	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	48000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	0	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-11079000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-46285000	usd
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-3756000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-2515000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-3102000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-560000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-12869000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-881000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	143000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	74000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	170000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	13000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	0	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7977000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1812000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-33329000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2705000	usd
CY2022Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	7897000	usd
CY2021Q2	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17982000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-3328000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	35766000	usd
CY2021Q1	us-gaap	Stockholders Equity StockholdersEquity	754565000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	19794000	usd
CY2021Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1812000	usd
CY2021Q2	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	491000	usd
CY2021Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	260000	usd
CY2021Q2	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	0	usd
CY2021Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1007000	usd
CY2021Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.13
CY2021Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2021Q2	us-gaap	Dividends Common Stock DividendsCommonStock	6392000	usd
CY2021Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	16.32
CY2021Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	14703000	usd
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	753210000	usd
CY2022Q1	us-gaap	Stockholders Equity StockholdersEquity	715398000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15874000	usd
CY2022Q2	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-7977000	usd
CY2022Q2	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	401000	usd
CY2022Q2	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	449000	usd
CY2022Q2	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	0	usd
CY2022Q2	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	0	usd
CY2022Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.13
CY2022Q2	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.13
CY2022Q2	us-gaap	Dividends Common Stock DividendsCommonStock	6130000	usd
CY2022Q2	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	12.96
CY2022Q2	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	2742000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	715273000	usd
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	753981000	usd
	us-gaap	Net Income Loss NetIncomeLoss	38471000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2705000	usd
	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	903000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	504000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	0	usd
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	1815000	usd
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.24
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.24
	us-gaap	Dividends Common Stock DividendsCommonStock	11839000	usd
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	15.11
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	24833000	usd
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	753210000	usd
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	739883000	usd
	us-gaap	Net Income Loss NetIncomeLoss	30001000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-33329000	usd
	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	852000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	845000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Restricted Stock Award Forfeitures RestrictedStockAwardForfeitures	0	usd
	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	231000	usd
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.26
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.26
	us-gaap	Dividends Common Stock DividendsCommonStock	12231000	usd
	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	14.84
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	10979000	usd
CY2022Q2	us-gaap	Stockholders Equity StockholdersEquity	715273000	usd
	us-gaap	Net Income Loss NetIncomeLoss	30001000	usd
	us-gaap	Net Income Loss NetIncomeLoss	38471000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	552000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	-6075000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1697000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1407000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	1857000	usd
	us-gaap	Depreciation Nonproduction DepreciationNonproduction	1945000	usd
	nfbk	Amortization Of Premiums And Deferred Loan Costs AmortizationOfPremiumsAndDeferredLoanCosts	4915000	usd
	nfbk	Amortization Of Premiums And Deferred Loan Costs AmortizationOfPremiumsAndDeferredLoanCosts	621000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	93000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	101000	usd
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	2331000	usd
	us-gaap	Operating Lease Right Of Use Asset Amortization Expense OperatingLeaseRightOfUseAssetAmortizationExpense	2167000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1687000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1705000	usd
	us-gaap	Gain Loss On Sale Of Notes Receivable GainLossOnSaleOfNotesReceivable	0	usd
	us-gaap	Gain Loss On Sale Of Notes Receivable GainLossOnSaleOfNotesReceivable	1401000	usd
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	264000	usd
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	606000	usd
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-2365000	usd
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1171000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	17000	usd
	us-gaap	Gains Losses On Sales Of Other Real Estate GainsLossesOnSalesOfOtherRealEstate	0	usd
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-695000	usd
	us-gaap	Increase Decrease In Trading Securities IncreaseDecreaseInTradingSecurities	-719000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	376000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-169000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	1155000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	10020000	usd
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	-623000	usd
	us-gaap	Increase Decrease In Other Accounts Payable And Accrued Liabilities IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities	366000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	40384000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	24988000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	300245000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	117546000	usd
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	7696000	usd
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	0	usd
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	0	usd
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	151559000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	5423000	usd
	us-gaap	Payments To Acquire Federal Home Loan Bank Stock PaymentsToAcquireFederalHomeLoanBankStock	220000	usd
	nfbk	Redemptions Of Federal Home Loan Bank Stock RedemptionsOfFederalHomeLoanBankStock	7817000	usd
	nfbk	Redemptions Of Federal Home Loan Bank Stock RedemptionsOfFederalHomeLoanBankStock	4353000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	164988000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	213761000	usd
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	2510000	usd
	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	0	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	193873000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	280050000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	76000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	788000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	41464000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	95472000	usd
	nfbk	Proceeds From Sale Of Equity Securities ProceedsFromSaleOfEquitySecurities	31000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1526000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	1021000	usd
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	125000	usd
	nfbk	Proceeds From Sale Of Equity Securities ProceedsFromSaleOfEquitySecurities	34000	usd
	us-gaap	Proceeds From Sale Of Other Real Estate ProceedsFromSaleOfOtherRealEstate	0	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1686000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1025000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-237636000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	200725000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	248668000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	31718000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	12231000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	11839000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	231000	usd
	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	1815000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10979000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	24833000	usd
	nfbk	Payments For Securities Sold Under Agreements To Repurchase PaymentsForSecuritiesSoldUnderAgreementsToRepurchase	75000000	usd
	nfbk	Payments For Securities Sold Under Agreements To Repurchase PaymentsForSecuritiesSoldUnderAgreementsToRepurchase	121725000	usd
	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	4549000	usd
	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	4526000	usd
	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	60917000	usd
	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	usd
	nfbk	Proceeds From Securities Sold Under Agreements To Repurchase ProceedsFromSecuritiesSoldUnderAgreementsToRepurchase	261000	usd
	nfbk	Proceeds From Securities Sold Under Agreements To Repurchase ProceedsFromSecuritiesSoldUnderAgreementsToRepurchase	265000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	216416000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-120073000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	19164000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	105640000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	91068000	usd
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	87544000	usd
CY2022Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	110232000	usd
CY2021Q2	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	193184000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1130384000	usd
	us-gaap	Interest Paid Net InterestPaidNet	6807000	usd
	us-gaap	Interest Paid Net InterestPaidNet	9833000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	11205000	usd
	us-gaap	Income Taxes Paid IncomeTaxesPaid	19100000	usd
	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	494000	usd
	us-gaap	Allowance For Loan And Lease Losses Writeoffs Net AllowanceForLoanAndLeaseLossesWriteoffsNet	2392000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4983000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
	us-gaap	Financing Receivable Reclassification To Held For Sale FinancingReceivableReclassificationToHeldForSale	2346000	usd
	us-gaap	Financing Receivable Reclassification To Held For Sale FinancingReceivableReclassificationToHeldForSale	131883000	usd
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	0	usd
	us-gaap	Transfer Of Loans Held For Sale To Portfolio Loans1 TransferOfLoansHeldForSaleToPortfolioLoans1	1612000	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	100000	usd
CY2021Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	89600000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	71000	usd
CY2022Q2	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	43587000	usd
CY2022Q2	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1086868000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	1205516000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	7824000	usd
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	5103000	usd
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	1208237000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	581600000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Restricted DebtSecuritiesAvailableForSaleRestricted	522100000	usd
CY2022Q2	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	41500000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	264000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
	us-gaap	Debt Securities Trading Realized Gain Loss DebtSecuritiesTradingRealizedGainLoss	1200000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	37689000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	970107000	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	509000	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	95500000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	606000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
CY2022Q2	us-gaap	Debt Securities Trading Realized Gain Loss DebtSecuritiesTradingRealizedGainLoss	-1600000	usd
	us-gaap	Debt Securities Trading Realized Gain Loss DebtSecuritiesTradingRealizedGainLoss	-2400000	usd
CY2021Q2	us-gaap	Debt Securities Trading Realized Gain Loss DebtSecuritiesTradingRealizedGainLoss	807000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	5898000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	83588000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	43587000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1053695000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	4637000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	689869000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	466000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	21328000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	5103000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	711197000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	2600000	usd
CY2021Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	2500000	usd
CY2022Q2	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	5201000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0	usd
CY2022Q2	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	224000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	4977000	usd
CY2021Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	5283000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	192000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	0	usd
CY2021Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	5475000	usd
	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	0	usd
	us-gaap	Debt Securities Held To Maturity Sold Amount DebtSecuritiesHeldToMaturitySoldAmount	0	usd
CY2022Q2	us-gaap	Held To Maturity Securities Restricted HeldToMaturitySecuritiesRestricted	2100000	usd
CY2021Q4	us-gaap	Held To Maturity Securities Restricted HeldToMaturitySecuritiesRestricted	2100000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	224000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Less Than Twelve Months Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue	4977000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	0	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Twelve Months Or Longer Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue	0	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Accumulated Loss HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss	224000	usd
CY2022Q2	us-gaap	Held To Maturity Securities Continuous Unrealized Loss Position Fair Value HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue	4977000	usd
CY2022Q2	nfbk	Debt Securities Held To Maturity Unrealized Loss Position Less Than Twelve Months Number Of Positions DebtSecuritiesHeldToMaturityUnrealizedLossPositionLessThanTwelveMonthsNumberOfPositions	6	security
CY2022Q2	nfbk	Debt Securities Held To Maturity Unrealized Loss Position Greater Than Twelve Months Number Of Positions DebtSecuritiesHeldToMaturityUnrealizedLossPositionGreaterThanTwelveMonthsNumberOfPositions	0	security
CY2021Q4	nfbk	Debt Securities Held To Maturity Unrealized Loss Position Number Of Positions DebtSecuritiesHeldToMaturityUnrealizedLossPositionNumberOfPositions	0	security
CY2022Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2022Q2	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	16000	usd
CY2021Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestAfterAllowanceForCreditLoss	15000	usd
CY2022Q2	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	7800000	usd
CY2021Q4	us-gaap	Equity Securities Fv Ni And Without Readily Determinable Fair Value EquitySecuritiesFvNiAndWithoutReadilyDeterminableFairValue	5300000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	4111857000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3806617000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	39031000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	38973000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	4072826000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	3767644000	usd
CY2022Q2	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	2300000	usd
CY2021Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	0	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10300000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	7600000	usd
	nfbk	Delinquent Status Classification Criteria Days Minimum DelinquentStatusClassificationCriteriaDaysMinimum	P90D
	nfbk	Delinquent Status Classification Criteria Days Minimum DelinquentStatusClassificationCriteriaDaysMinimum	P90D
CY2022Q2	nfbk	Principal Balance Threshold For Non Accrual Status PrincipalBalanceThresholdForNonAccrualStatus	500000	usd
CY2022Q2	nfbk	Loans Deemed To Be Impaired Non Accrual Amount LoansDeemedToBeImpairedNonAccrualAmount	5400000	usd
CY2021Q4	nfbk	Loans Deemed To Be Impaired Non Accrual Amount LoansDeemedToBeImpairedNonAccrualAmount	4200000	usd
CY2022Q2	nfbk	Principal Balance Threshold For Non Accrual Status PrincipalBalanceThresholdForNonAccrualStatus	500000	usd
CY2022Q2	nfbk	Loans On Non Accrual Status With Principal Balances Below Threshold Definition Of Impaired Loan LoansOnNonAccrualStatusWithPrincipalBalancesBelowThresholdDefinitionOfImpairedLoan	4900000	usd
CY2021Q4	nfbk	Loans On Non Accrual Status With Principal Balances Below Threshold Definition Of Impaired Loan LoansOnNonAccrualStatusWithPrincipalBalancesBelowThresholdDefinitionOfImpairedLoan	3400000	usd
	nfbk	Delinquent Status Classification Criteria Days Minimum DelinquentStatusClassificationCriteriaDaysMinimum	P90D
CY2021	nfbk	Delinquent Status Classification Criteria Days Minimum DelinquentStatusClassificationCriteriaDaysMinimum	P90D
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest90 Days Or More Past Due Still Accruing FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing	211000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest90 Days Or More Past Due Still Accruing FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing	384000	usd
	nfbk	Delinquent Status Classification Criteria Days Minimum DelinquentStatusClassificationCriteriaDaysMinimum	P90D
	nfbk	Delinquent Status Classification Criteria Days Minimum DelinquentStatusClassificationCriteriaDaysMinimum	P90D
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10263000	usd
CY2022Q2	nfbk	Financing Receivable Excluding Accrued Interest Nonaccrual Unpaid Principal Balance FinancingReceivableExcludingAccruedInterestNonaccrualUnpaidPrincipalBalance	11323000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	5383000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	7622000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	30200	usd
CY2021Q4	nfbk	Financing Receivable Excluding Accrued Interest Nonaccrual Unpaid Principal Balance FinancingReceivableExcludingAccruedInterestNonaccrualUnpaidPrincipalBalance	8743000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	4241000	usd
CY2022Q2	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	119000	usd
CY2021Q2	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	46000	usd
	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	159000	usd
	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	95000	usd
CY2022Q2	nfbk	Financing Receivable Impaired Secured By Collateral FinancingReceivableImpairedSecuredByCollateral	7900000	usd
CY2021Q4	nfbk	Financing Receivable Impaired Secured By Collateral FinancingReceivableImpairedSecuredByCollateral	7400000	usd
CY2022Q2	nfbk	Trouble Debt Restructuring Amount TroubleDebtRestructuringAmount	7300000	usd
CY2021Q4	nfbk	Trouble Debt Restructuring Amount TroubleDebtRestructuringAmount	9000000	usd
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	contract
CY2022Q2	nfbk	Financing Receivable Threshold Individually Evaluated For Impairment FinancingReceivableThresholdIndividuallyEvaluatedForImpairment	500000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	36600	usd
CY2022Q1	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	2131000	usd
CY2021Q4	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	1852000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-349000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-628000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	2480000	usd
CY2022Q2	us-gaap	Off Balance Sheet Credit Loss Liability OffBalanceSheetCreditLossLiability	2480000	usd
CY2022Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	39274000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	525000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	133000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	149000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	39031000	usd
CY2021Q1	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	43197000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	12000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	9000	usd
CY2021Q2	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-3701000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	39493000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	38973000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	710000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	216000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	552000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	39031000	usd
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	37607000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	2444000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	52000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	-6075000	usd
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	39493000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	37000	usd
CY2022Q2	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	34836000	usd
CY2022Q2	nfbk	Financing Receivable Allowance For Credit Losses Pcd Loans Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesPCDLoansEvaluatedForImpairment	4158000	usd
CY2022Q2	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	4111857000	usd
CY2022Q2	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	9498000	usd
CY2022Q2	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	4077274000	usd
CY2022Q2	nfbk	Financing Receivables Pcd Loans Evaluated For Impairment FinancingReceivablesPCDLoansEvaluatedForImpairment	13136000	usd
CY2022Q2	nfbk	Financing Receivable Not Evaluated For Impairment FinancingReceivableNotEvaluatedForImpairment	11949000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	30000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	34211000	usd
CY2021Q4	nfbk	Financing Receivable Allowance For Credit Losses Pcd Loans Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesPCDLoansEvaluatedForImpairment	4732000	usd
CY2021Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	3806617000	usd
CY2021Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	9986000	usd
CY2021Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	3740295000	usd
CY2021Q4	nfbk	Financing Receivables Pcd Loans Evaluated For Impairment FinancingReceivablesPCDLoansEvaluatedForImpairment	15819000	usd
CY2021Q4	nfbk	Financing Receivable Not Evaluated For Impairment FinancingReceivableNotEvaluatedForImpairment	40517000	usd
CY2022Q2	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	916343000	usd
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	898490000	usd
CY2022Q2	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	1287458000	usd
CY2021Q4	us-gaap	Deposits Negotiable Order Of Withdrawal Now DepositsNegotiableOrderOfWithdrawalNOW	1112292000	usd
CY2022Q2	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1691421000	usd
CY2021Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	1776191000	usd
CY2022Q2	us-gaap	Time Deposits TimeDeposits	522780000	usd
CY2021Q4	us-gaap	Time Deposits TimeDeposits	382361000	usd
CY2022Q2	us-gaap	Deposits Deposits	4418002000	usd
CY2021Q4	us-gaap	Deposits Deposits	4169334000	usd
CY2022Q2	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	599000	usd
CY2021Q2	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	845000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	1170000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Demand InterestExpenseDomesticDepositLiabilitiesDemand	1777000	usd
CY2022Q2	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	735000	usd
CY2021Q2	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	826000	usd
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1769979	shares
	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	1323000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	1764000	usd
CY2022Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	1334000	usd
CY2021Q2	us-gaap	Interest Expense Deposits InterestExpenseDeposits	1671000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	2493000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3541000	usd
CY2022Q2	us-gaap	Subordinated Debt SubordinatedDebt	62000000	usd
	us-gaap	Subordinated Borrowing Interest Rate SubordinatedBorrowingInterestRate	0.0500
CY2022Q2	us-gaap	Deferred Finance Costs Net DeferredFinanceCostsNet	1100000	usd
CY2022Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.96
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y5M15D
CY2021Q4	nfbk	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue	4.02
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	13.95
CY2021	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P2Y11M12D
	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	17040	shares
	nfbk	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageGrantDateFairValue	3.95
	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	13.54
CY2022Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1752939	shares
CY2022Q2	nfbk	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageGrantDateFairValue	4.02
CY2022Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1752939	shares
CY2022Q2	nfbk	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageGrantDateFairValue	4.02
CY2022Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	13.96
	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P2Y5M15D
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod	62836	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	222844	shares
CY2021Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	13.21
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	181908	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	15.78
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue	12.87
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	16613	shares
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	14.28
CY2022Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	325303	shares
CY2022Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	14.66
CY2022Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	449000	usd
CY2021Q2	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	261000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	845000	usd
	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	504000	usd
CY2022Q2	nfbk	Investment Owned At Net Asset Value InvestmentOwnedAtNetAssetValue	7500000	usd
CY2021Q4	nfbk	Investment Owned At Net Asset Value InvestmentOwnedAtNetAssetValue	5000000	usd
CY2021Q4	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	100000	usd
CY2022Q2	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	2902000	usd
CY2021Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	3807000	usd
CY2022Q2	nfbk	Other Real Estate Owned Fair Value Disclosure OtherRealEstateOwnedFairValueDisclosure	0	usd
CY2021Q4	nfbk	Other Real Estate Owned Fair Value Disclosure OtherRealEstateOwnedFairValueDisclosure	100000	usd
CY2022Q2	nfbk	Principal Amount Outstanding Of Impaired Loans Heldfor Investment Heldfor Sale PrincipalAmountOutstandingOfImpairedLoansHeldforInvestmentHeldforSale	4400000	usd
CY2021Q4	nfbk	Principal Amount Outstanding Of Impaired Loans Heldfor Investment Heldfor Sale PrincipalAmountOutstandingOfImpairedLoansHeldforInvestmentHeldforSale	5800000	usd
CY2022Q2	nfbk	Estimated Fair Value Of Impaired Loans Held For Investment EstimatedFairValueOfImpairedLoansHeldForInvestment	2900000	usd
CY2021Q4	nfbk	Estimated Fair Value Of Impaired Loans Held For Investment EstimatedFairValueOfImpairedLoansHeldForInvestment	3800000	usd
	nfbk	Impaired Financing Receivable Reserve Increase Decrease ImpairedFinancingReceivableReserveIncreaseDecrease	6000	usd
	nfbk	Impaired Financing Receivable Reserve Increase Decrease ImpairedFinancingReceivableReserveIncreaseDecrease	-5000	usd
	nfbk	Impaired Financing Receivables Charge Off ImpairedFinancingReceivablesChargeOff	494000	usd
	nfbk	Impaired Financing Receivables Charge Off ImpairedFinancingReceivablesChargeOff	2400000	usd
CY2022Q2	us-gaap	Real Estate Acquired Through Foreclosure RealEstateAcquiredThroughForeclosure	0	usd
CY2022Q2	nfbk	Investment Owned At Net Asset Value InvestmentOwnedAtNetAssetValue	7500000	usd
CY2021Q4	nfbk	Investment Owned At Net Asset Value InvestmentOwnedAtNetAssetValue	5000000	usd
CY2022Q2	us-gaap	Net Income Loss NetIncomeLoss	15874000	usd
CY2021Q2	us-gaap	Net Income Loss NetIncomeLoss	19794000	usd
	us-gaap	Net Income Loss NetIncomeLoss	30001000	usd
	us-gaap	Net Income Loss NetIncomeLoss	38471000	usd
CY2022Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46591723	shares
CY2021Q2	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	48907585	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	46708716	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	49216157	shares
CY2022Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	46390	shares
CY2021Q2	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	400076	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	161717	shares
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	252651	shares
CY2022Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46638113	shares
CY2021Q2	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49307661	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	46870433	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	49468808	shares
CY2022Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.34
CY2021Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.40
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.64
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.78
CY2022Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.34
CY2021Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.40
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.64
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.78
CY2022Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1922988	shares
CY2021Q2	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	125744	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1098229	shares
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	564061	shares
CY2022Q2	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	36600000	usd
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	42300000	usd
CY2021Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	33900000	usd
CY2021Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	39900000	usd
CY2022Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	1521000	usd
CY2021Q2	us-gaap	Operating Lease Cost OperatingLeaseCost	1453000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	2990000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	2908000	usd
CY2022Q2	us-gaap	Variable Lease Cost VariableLeaseCost	863000	usd
CY2021Q2	us-gaap	Variable Lease Cost VariableLeaseCost	1010000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	1828000	usd
	us-gaap	Variable Lease Cost VariableLeaseCost	2245000	usd
CY2022Q2	us-gaap	Lease Cost LeaseCost	2384000	usd
CY2021Q2	us-gaap	Lease Cost LeaseCost	2463000	usd
	us-gaap	Lease Cost LeaseCost	4818000	usd
	us-gaap	Lease Cost LeaseCost	5153000	usd
CY2022Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1375000	usd
CY2021Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1327000	usd
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2706000	usd
	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2524000	usd
CY2022Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	848000	usd
CY2021Q2	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	857000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1687000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1705000	usd
CY2022Q2	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	0	usd
CY2021Q2	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	509000	usd
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	264000	usd
	us-gaap	Debt Securities Available For Sale Gain Loss DebtSecuritiesAvailableForSaleGainLoss	606000	usd
CY2022Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	1597000	usd
CY2021Q2	us-gaap	Operating Lease Payments OperatingLeasePayments	1691000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	3161000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	3399000	usd
CY2022Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4983000	usd
CY2021Q2	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4983000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2022Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P11Y4M13D
CY2021Q2	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y2M26D
CY2022Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0352
CY2021Q2	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0361
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	3188000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	6490000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	6069000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	5729000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	4967000	usd
CY2022Q2	nfbk	Lessee Operating Lease Liability Payments Due After Year Four LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour	26564000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	53007000	usd
CY2022Q2	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	10709000	usd
CY2022Q2	us-gaap	Operating Lease Liability OperatingLeaseLiability	42298000	usd
CY2022Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-1563000	usd
CY2021Q2	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	807000	usd
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	-2365000	usd
	us-gaap	Debt And Equity Securities Gain Loss DebtAndEquitySecuritiesGainLoss	1171000	usd
CY2022Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
CY2021Q2	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1401000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	0	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1401000	usd
CY2022Q2	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	105000	usd
CY2021Q2	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	15000	usd
	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	186000	usd
	us-gaap	Revenue Not From Contract With Customer Other RevenueNotFromContractWithCustomerOther	145000	usd
CY2022Q2	us-gaap	Noninterest Income NoninterestIncome	765000	usd
CY2021Q2	us-gaap	Noninterest Income NoninterestIncome	4916000	usd
	us-gaap	Noninterest Income NoninterestIncome	2478000	usd
	us-gaap	Noninterest Income NoninterestIncome	7552000	usd
CY2022Q2	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	usd
	us-gaap	Derivative Gain Loss On Derivative Net DerivativeGainLossOnDerivativeNet	0	usd

Files In Submission

Name	View Source	Status
0001493225-22-000083-index-headers.html	Edgar Link	pending
0001493225-22-000083-index.html	Edgar Link	pending
0001493225-22-000083.txt	Edgar Link	pending
0001493225-22-000083-xbrl.zip	Edgar Link	pending
ex311-2022x6x30.htm	Edgar Link	pending
ex312-2022x6x30.htm	Edgar Link	pending
ex32-2022x6x30.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
nfbk-20220630.htm	Edgar Link	pending
nfbk-20220630.xsd	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
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$NFBK
Northfield Bancorp, Inc. Stock $nfbk

2022 Q3 Form 10-Q Financial Statement

#000149322522000083 Filed on August 08, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NFBK Northfield Bancorp, Inc. Stock $nfbk

2022 Q3 Form 10-Q Financial Statement

#000149322522000083 Filed on August 08, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NFBK
Northfield Bancorp, Inc. Stock $nfbk