$FNWB
First Northwest Bancorp Stock $fnwb

$fnwb Overview Financials Valuation SEC Filings Company Website

2024 Q1 Form 10-K Financial Statement

#000143774924008142 Filed on March 15, 2024

Income Statement

Concept	2024 Q1	2023 Q4	2023
Revenue	$27.33M		$100.9M
YoY Change	17.37%		25.53%
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	$382.0K	$415.0K	$1.600M
YoY Change	-3.54%	-16.5%	-20.0%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense	$13.40M		$39.47M
YoY Change	92.03%		275.34%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$843.0K	-$6.876M	$2.675M
YoY Change	-80.25%	-200.09%	-83.63%
Income Tax	$447.0K	-$1.354M	$549.0K
% Of Pretax Income	53.02%		20.52%
Net Earnings	$396.0K	-$5.494M	$2.286M
YoY Change	-88.78%	-191.4%	-85.39%
Net Earnings / Revenue	1.45%		2.27%
Basic Earnings Per Share	$0.04		$0.26
Diluted Earnings Per Share	$0.04	-$0.61	$0.26
COMMON SHARES
Basic Shares Outstanding	9.443M	9.618M	8.918M
Diluted Shares Outstanding	8.907M		8.941M

Balance Sheet

Concept	2024 Q1	2023 Q4	2023
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$77.35M	$123.2M
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	$11.03M	$18.05M	$18.05M
YoY Change	-39.58%	-0.22%	-27.19%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$19.46M	$13.00M	$13.00M
YoY Change	36.9%	-7.74%	-7.74%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.240B	$2.202B	$2.202B
YoY Change	3.13%	7.82%	7.82%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.830M	$3.396M	$3.396M
YoY Change	457.09%	646.37%	646.37%
Accrued Expenses	$36.21M	$35.97M	$35.97M
YoY Change	2.7%	11.22%	11.22%
Deferred Revenue
YoY Change
Short-Term Debt	$10.00M	$6.500M	$6.500M
YoY Change	-9.09%	-45.83%	-45.83%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$49.04M	$39.37M	$39.37M
YoY Change	37.12%	20.03%	20.03%
LONG-TERM LIABILITIES
Long-Term Debt	$39.46M	$320.9M	$320.9M
YoY Change
Other Long-Term Liabilities	$2.398M	$1.260M	$1.260M
YoY Change	-0.5%	-8.43%	-8.43%
Total Long-Term Liabilities	$41.85M	$322.2M	$322.2M
YoY Change	1636.64%	23315.41%	23315.41%
TOTAL LIABILITIES
Total Short-Term Liabilities	$49.04M	$39.37M	$39.37M
Total Long-Term Liabilities	$41.85M	$322.2M	$322.2M
Total Liabilities	$2.080B	$2.038B	$2.038B
YoY Change	3.37%	8.21%	8.4%
SHAREHOLDERS EQUITY
Retained Earnings	$106.2M	$107.3M
YoY Change	-6.95%	-6.18%
Common Stock	$94.00K	$96.00K
YoY Change	-3.09%	-1.03%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$160.5M	$163.3M	$163.3M
YoY Change
Total Liabilities & Shareholders Equity	$2.240B	$2.202B	$2.202B
YoY Change	3.13%	7.82%	7.82%

Cashflow Statement

Concept	2024 Q1	2023 Q4	2023
OPERATING ACTIVITIES
Net Income	$396.0K	-$5.494M	$2.286M
YoY Change	-88.78%	-191.4%	-85.39%
Depreciation, Depletion And Amortization	$382.0K	$415.0K	$1.600M
YoY Change	-3.54%	-16.5%	-20.0%
Cash From Operating Activities	-$4.865M	$2.585M	$17.88M
YoY Change	-171.65%	18.14%	12.41%
INVESTING ACTIVITIES
Capital Expenditures	$113.0K	$501.0K	$1.571M
YoY Change	-79.79%	39.94%	-46.09%
Acquisitions
YoY Change
Other Investing Activities	-$78.35M	-$393.0K	-$82.62M
YoY Change	125.45%	-94.36%	-64.8%
Cash From Investing Activities	-$78.47M	-$894.0K	-$84.19M
YoY Change	122.2%	-87.81%	-64.57%
FINANCING ACTIVITIES
Cash Dividend Paid	$671.0K		$2.700M
YoY Change	0.0%		-3.12%
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	$37.51M	37.59M	$143.9M
YoY Change	-69.64%	-171.03%	1.82%
NET CHANGE
Cash From Operating Activities	-$4.865M	2.585M	$17.88M
Cash From Investing Activities	-$78.47M	-894.0K	-$84.19M
Cash From Financing Activities	$37.51M	37.59M	$143.9M
Net Change In Cash	-$45.82M	39.28M	$77.57M
YoY Change	-148.22%	-167.65%	-196.46%
FREE CASH FLOW
Cash From Operating Activities	-$4.865M	$2.585M	$17.88M
Capital Expenditures	$113.0K	$501.0K	$1.571M
Free Cash Flow	-$4.978M	$2.084M	$16.30M
YoY Change	-179.89%	13.88%	25.53%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2023	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2023	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2023	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2023
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CY2022Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
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CY2022Q4	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.28
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CY2022Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	usd
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CY2023	dei	Document Type DocumentType	10-K
CY2023	dei	Document Annual Report DocumentAnnualReport	true
CY2023	dei	Document Period End Date DocumentPeriodEndDate	2023-12-31
CY2023	dei	Document Transition Report DocumentTransitionReport	false
CY2023	dei	Entity File Number EntityFileNumber	001-36741
CY2023	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	WA
CY2023	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	46-1259100
CY2023	dei	Entity Address Address Line1 EntityAddressAddressLine1	105 West 8th Street
CY2023	dei	Entity Address City Or Town EntityAddressCityOrTown	Port Angeles
CY2023	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
CY2023	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98362
CY2023	dei	City Area Code CityAreaCode	360
CY2023	dei	Local Phone Number LocalPhoneNumber	457-0461
CY2023	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
CY2023	dei	Trading Symbol TradingSymbol	FNWB
CY2023	dei	Security Exchange Name SecurityExchangeName	NASDAQ
CY2023	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2023	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
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CY2023	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
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CY2023	dei	Auditor Name AuditorName	Moss Adams LLP
CY2023	dei	Auditor Location AuditorLocation	Everett, Washington
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CY2023	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	1357000	usd
CY2022	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	888000	usd
CY2023	us-gaap	Other Noninterest Expense OtherNoninterestExpense	6348000	usd
CY2022	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3699000	usd
CY2023	us-gaap	Noninterest Expense NoninterestExpense	61454000	usd
CY2022	us-gaap	Noninterest Expense NoninterestExpense	62312000	usd
CY2023	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	2675000	usd
CY2022	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	16343000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	549000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2847000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	2126000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	13496000	usd
CY2023	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-160000	usd
CY2022	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-2149000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	2286000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	15645000	usd
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
CY2023	us-gaap	Profit Loss ProfitLoss	2126000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	13496000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	4890000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-51204000	usd
CY2023	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	824000	usd
CY2022	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-10753000	usd
CY2023	us-gaap	Oci Liability For Future Policy Benefit Gain Loss Before Reclassification Adjustment And Tax OciLiabilityForFuturePolicyBenefitGainLossBeforeReclassificationAdjustmentAndTax	397000	usd
CY2022	us-gaap	Oci Liability For Future Policy Benefit Gain Loss Before Reclassification Adjustment And Tax OciLiabilityForFuturePolicyBenefitGainLossBeforeReclassificationAdjustmentAndTax	-509000	usd
CY2023	us-gaap	Oci Liability For Future Policy Benefit Gain Loss Before Reclassification Adjustment Tax OciLiabilityForFuturePolicyBenefitGainLossBeforeReclassificationAdjustmentTax	85000	usd
CY2022	us-gaap	Oci Liability For Future Policy Benefit Gain Loss Before Reclassification Adjustment Tax OciLiabilityForFuturePolicyBenefitGainLossBeforeReclassificationAdjustmentTax	-106000	usd
CY2023	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-150000	usd
CY2022	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-147000	usd
CY2023	fnwb	Defined Benefit Plan Amortization Of Prior Service Cost Credit Tax DefinedBenefitPlanAmortizationOfPriorServiceCostCreditTax	-32000	usd
CY2022	fnwb	Defined Benefit Plan Amortization Of Prior Service Cost Credit Tax DefinedBenefitPlanAmortizationOfPriorServiceCostCreditTax	-31000	usd
CY2023	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationBeforeTax	-1054000	usd
CY2022	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationBeforeTax	0	usd
CY2023	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationTax	-226000	usd
CY2022	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationTax	-0	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-5397000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	118000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-1158000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	25000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7907000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-40831000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	10033000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-27335000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-160000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-2149000	usd
CY2023	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	10193000	usd
CY2022	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-25186000	usd
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	190480000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	13496000	usd
CY2022	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	1869000	usd
CY2022	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5870000	usd
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2022	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	392000	usd
CY2022	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-40831000	usd
CY2022Q4	fnwb	Asset Sale Insubstance Distribution AssetSaleInsubstanceDistribution	661000	usd
CY2022Q4	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1601000	usd
CY2022Q4	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	952000	usd
CY2022Q4	us-gaap	Dividends Cash DividendsCash	2787000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	158282000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	2126000	usd
CY2023	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1149000	usd
CY2023	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2023	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	280000	usd
CY2023	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	7907000	usd
CY2023Q4	fnwb	Close Out Of Investment CloseOutOfInvestment	-0	usd
CY2023Q4	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1413000	usd
CY2023Q4	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	692000	usd
CY2023Q4	us-gaap	Dividends Cash DividendsCash	2700000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	163340000	usd
CY2023	us-gaap	Profit Loss ProfitLoss	2126000	usd
CY2022	us-gaap	Profit Loss ProfitLoss	13496000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1612000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1960000	usd
CY2023	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3000	usd
CY2022	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	94000	usd
CY2023	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1387000	usd
CY2022	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1666000	usd
CY2023	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	653000	usd
CY2022	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-981000	usd
CY2023	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	78000	usd
CY2022	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	78000	usd
CY2023	fnwb	Fair Value Adjustment Of Sold Loan Servicing Rights FairValueAdjustmentOfSoldLoanServicingRights	243000	usd
CY2022	fnwb	Fair Value Adjustment Of Sold Loan Servicing Rights FairValueAdjustmentOfSoldLoanServicingRights	-13000	usd
CY2023	fnwb	Servicing Asset At Fair Value Additions Net ServicingAssetAtFairValueAdditionsNet	-149000	usd
CY2022	fnwb	Servicing Asset At Fair Value Additions Net ServicingAssetAtFairValueAdditionsNet	-54000	usd
CY2023	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	2357000	usd
CY2022	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1535000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	134000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1529000	usd
CY2023	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	692000	usd
CY2022	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	673000	usd
CY2023	us-gaap	Share Based Compensation ShareBasedCompensation	1413000	usd
CY2022	us-gaap	Share Based Compensation ShareBasedCompensation	1601000	usd
CY2023	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	438000	usd
CY2022	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	824000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-5397000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	118000	usd
CY2023	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	928000	usd
CY2022	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	916000	usd
CY2023	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	-0	usd
CY2022	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	1489000	usd
CY2023	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	25612000	usd
CY2022	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	25926000	usd
CY2023	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	25894000	usd
CY2022	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	26913000	usd
CY2023	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1151000	usd
CY2022	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1454000	usd
CY2023	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1293000	usd
CY2022	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	3938000	usd
CY2023	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	2941000	usd
CY2022	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	62000	usd
CY2023	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	2270000	usd
CY2022	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	3104000	usd
CY2023	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	17875000	usd
CY2022	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15902000	usd
CY2023	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	20330000	usd
CY2022	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	78409000	usd
CY2023	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	14161000	usd
CY2022	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	30497000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	40619000	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	12685000	usd
CY2023	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	1983000	usd
CY2022	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	6485000	usd
CY2023	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	15000	usd
CY2022	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	0	usd
CY2023	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	114997000	usd
CY2022	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	183691000	usd
CY2023	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1571000	usd
CY2022	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	2914000	usd
CY2023	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	608000	usd
CY2022	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	7364000	usd
CY2023	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	759000	usd
CY2022	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	0	usd
CY2023	fnwb	Payments To Acquire Lowincome Housing Tax Credit Partnerships PaymentsToAcquireLowincomeHousingTaxCreditPartnerships	259000	usd
CY2022	fnwb	Payments To Acquire Lowincome Housing Tax Credit Partnerships PaymentsToAcquireLowincomeHousingTaxCreditPartnerships	137000	usd
CY2023	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	-0	usd
CY2022	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	1829000	usd
CY2023	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-84194000	usd
CY2022	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-237647000	usd
CY2023	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	112637000	usd
CY2022	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-16325000	usd
CY2023	fnwb	Proceeds From Fhl Bank Advance Financing Activities ProceedsFromFHLBankAdvanceFinancingActivities	15000000	usd
CY2022	fnwb	Proceeds From Fhl Bank Advance Financing Activities ProceedsFromFHLBankAdvanceFinancingActivities	0	usd
CY2023	fnwb	Payments Of Fhlbank Borrowings Financing Activities Longterm PaymentsOfFhlbankBorrowingsFinancingActivitiesLongterm	15000000	usd
CY2022	fnwb	Payments Of Fhlbank Borrowings Financing Activities Longterm PaymentsOfFhlbankBorrowingsFinancingActivitiesLongterm	-0	usd
CY2023	fnwb	Payments Of Fhlbank Borrowings Financing Activities Shortterm PaymentsOfFhlbankBorrowingsFinancingActivitiesShortterm	-41000000	usd
CY2022	fnwb	Payments Of Fhlbank Borrowings Financing Activities Shortterm PaymentsOfFhlbankBorrowingsFinancingActivitiesShortterm	-154000000	usd
CY2023	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-5500000	usd
CY2022	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	12000000	usd
CY2023	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-116000	usd
CY2022	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	268000	usd
CY2023	us-gaap	Payments Of Dividends PaymentsOfDividends	2700000	usd
CY2022	us-gaap	Payments Of Dividends PaymentsOfDividends	2787000	usd
CY2023	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	280000	usd
CY2022	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	392000	usd
CY2023	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1149000	usd
CY2022	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5439000	usd
CY2023	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	143892000	usd
CY2022	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	141325000	usd
CY2023	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	77573000	usd
CY2022	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-80420000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	45596000	usd
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	126016000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	123169000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	45596000	usd
CY2023	us-gaap	Interest Paid Net InterestPaidNet	36526000	usd
CY2022	us-gaap	Interest Paid Net InterestPaidNet	10453000	usd
CY2023	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2125000	usd
CY2022	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4446000	usd
CY2023	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	10287000	usd
CY2022	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	-51322000	usd
CY2023	fnwb	Unrealized Gain Loss On Fair Value Hedging Instruments UnrealizedGainLossOnFairValueHedgingInstruments	-1054000	usd
CY2022	fnwb	Unrealized Gain Loss On Fair Value Hedging Instruments UnrealizedGainLossOnFairValueHedgingInstruments	0	usd
CY2023	fnwb	Cumulative Adjustment To Servicing Right Asset Due To Election Of Fair Value Option CumulativeAdjustmentToServicingRightAssetDueToElectionOfFairValueOption	0	usd
CY2022	fnwb	Cumulative Adjustment To Servicing Right Asset Due To Election Of Fair Value Option CumulativeAdjustmentToServicingRightAssetDueToElectionOfFairValueOption	538000	usd
CY2023	fnwb	Cumulative Effect Of Adoption Of New Accounting Standard CumulativeEffectOfAdoptionOfNewAccountingStandard	-3735000	usd
CY2022	fnwb	Cumulative Effect Of Adoption Of New Accounting Standard CumulativeEffectOfAdoptionOfNewAccountingStandard	0	usd
CY2023	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	152000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2023	fnwb	Transfer Of Bank Owned Life Insurance Proceeds To Prepaid Expenses And Other Assets TransferOfBankOwnedLifeInsuranceProceedsToPrepaidExpensesAndOtherAssets	0	usd
CY2022	fnwb	Transfer Of Bank Owned Life Insurance Proceeds To Prepaid Expenses And Other Assets TransferOfBankOwnedLifeInsuranceProceedsToPrepaidExpensesAndOtherAssets	2057000	usd
CY2023	fnwb	Equity Investment Received Through Asset Sale EquityInvestmentReceivedThroughAssetSale	-225000	usd
CY2022	fnwb	Equity Investment Received Through Asset Sale EquityInvestmentReceivedThroughAssetSale	225000	usd
CY2023	fnwb	Stock Issued To Acquire Investment In Partnership StockIssuedToAcquireInvestmentInPartnership	0	usd
CY2022	fnwb	Stock Issued To Acquire Investment In Partnership StockIssuedToAcquireInvestmentInPartnership	1869000	usd
CY2015Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	13100360
CY2015Q1	fnwb	Proceeds From Issuance Of Common Stock Net ProceedsFromIssuanceOfCommonStockNet	117600000	usd
CY2015Q1	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	58400000	usd
CY2014Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	79700000	usd
CY2015Q4	fnwb	Employee Stock Ownership Plan Esop EmployeeStockOwnershipPlanESOP	0.08	pure
CY2015Q4	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	1048029
CY2015Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2015Q4	fnwb	Employee Stock Ownership Plan Esop Number Of Shares Purchased Percentage EmployeeStockOwnershipPlanEsopNumberOfSharesPurchasedPercentage	1	pure
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	439174
CY2023	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"><b>Use of estimates </b>- The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make assumptions. These assumptions result in estimates that affect the reported amounts of assets and liabilities, revenues and expenses, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to a determination of the allowance for credit losses, fair value of financial instruments, deferred tax assets and liabilities, and the valuation of collateral dependent loans.</p> <p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"> </p>
CY2023Q4	us-gaap	Trading Securities TradingSecurities	0	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	usd
CY2023Q4	fnwb	Federal Home Loan Bank Minimum Investment Requirement FederalHomeLoanBankMinimumInvestmentRequirement	13700000	usd
CY2022Q4	fnwb	Federal Home Loan Bank Minimum Investment Requirement FederalHomeLoanBankMinimumInvestmentRequirement	11700000	usd
CY2023Q4	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Remaining Balance TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseRemainingBalance	1800000	usd
CY2022Q4	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Remaining Balance TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseRemainingBalance	1900000	usd
CY2023	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Amount Repurchased TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseAmountRepurchased	0	usd
CY2022Q4	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Allowance Reserve TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseAllowanceReserve	9000	usd
CY2023Q1	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	2200000	usd
CY2023Q1	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0118	pure
CY2022Q4	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0104	pure
CY2023Q4	srt	Financing Receivable Allowance For Credit Loss To Outstanding Percent FinancingReceivableAllowanceForCreditLossToOutstandingPercent	0.0105	pure
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3300000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	150000	usd
CY2023	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"><b style="font-size: 10pt;">Reclassifications</b><b style="font-size: 10pt;"> </b>- Certain amounts in prior periods have been reclassified to conform to the current audited financial statement presentation with <em style="font: inherit;">no</em> effect on net income or shareholders' equity.</p> <p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"> </p>
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	333950000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	0	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	38327000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	295623000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	375183000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	1000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	48615000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	326569000	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	1900000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	2000000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	176000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	19494000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	38151000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	274306000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	38327000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	293800000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	27459000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	204141000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	21156000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	119642000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	48615000	usd
CY2022Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	323783000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	6	pure
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	156	pure
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	113	pure
CY2022Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	69	pure
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	333950000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	295623000	usd
CY2022Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	375183000	usd
CY2022Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	326569000	usd
CY2023	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	40619000	usd
CY2022	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	12685000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	128000	usd
CY2023	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-5397000	usd
CY2022	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-10000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	14800000	usd
CY2022Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	13200000	usd
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	6000000	usd
CY2022Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	4700000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1660028000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1547551000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	17510000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16116000	usd
CY2023Q4	us-gaap	Notes Receivable Net NotesReceivableNet	1642518000	usd
CY2022Q4	us-gaap	Notes Receivable Net NotesReceivableNet	1531435000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1660028000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1547551000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	18644000	usd
CY2022Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	1793000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	58000	usd
CY2023Q4	us-gaap	Notes Receivable Gross NotesReceivableGross	1547551000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1660028000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1547551000	usd
CY2023Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	242609000	usd
CY2023Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	452690000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	443246000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	253325000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	54901000	usd
CY2023Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	135114000	usd
CY2023Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	78143000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1660028000	usd
CY2023	us-gaap	Financing Receivable Year One Originated Current Fiscal Year Writeoff FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff	0	usd
CY2023	us-gaap	Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	3018000	usd
CY2023	us-gaap	Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	15000	usd
CY2023	us-gaap	Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	52000	usd
CY2023	us-gaap	Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	11000	usd
CY2023	us-gaap	Financing Receivable Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	122000	usd
CY2023	us-gaap	Financing Receivable Revolving Writeoff FinancingReceivableRevolvingWriteoff	104000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3322000	usd
CY2022Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1547551000	usd
CY2023Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	20000000	usd
CY2023Q4	fnwb	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	165000	usd
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	1753000	usd
CY2022Q4	fnwb	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	29000	usd
CY2022Q4	fnwb	Financing Receivable Troubled Debt Restructuring Accrual FinancingReceivableTroubledDebtRestructuringAccrual	1724000	usd
CY2022Q4	fnwb	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	29000	usd
CY2022Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	1753000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16116000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	3322000	usd
CY2023	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	150000	usd
CY2023	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	2357000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	17510000	usd
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	15124000	usd
CY2022	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	1535000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	1025000	usd
CY2022	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	482000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16116000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16116000	usd
CY2022Q4	fnwb	Financing Receivables Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivablesAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	16084000	usd
CY2022Q4	fnwb	Financing Receivables Allowance For Credit Losses Individually Evaluated For Impairment FinancingReceivablesAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	32000	usd
CY2022Q4	fnwb	Financing Receivable Aggregate Loans Evaluated FinancingReceivableAggregateLoansEvaluated	1534380000	usd
CY2022Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1531346000	usd
CY2022Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	3034000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	716000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	870000	usd
CY2022	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	1054000	usd
CY2022	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	102000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	2318000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	2467000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	32000	usd
CY2022	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	2525000	usd
CY2022	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	152000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	3034000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	3337000	usd
CY2022Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	32000	usd
CY2022	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	3579000	usd
CY2022	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	254000	usd
CY2022	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	141000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	35618000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	34760000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	17569000	usd
CY2022Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	16671000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	18049000	usd
CY2022Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	18089000	usd
CY2023	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1600000	usd
CY2022	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	2000000	usd
CY2023	us-gaap	Lease Cost LeaseCost	1170000	usd
CY2022	us-gaap	Lease Cost LeaseCost	1190000	usd
CY2023	us-gaap	Operating Lease Payments OperatingLeasePayments	1165000	usd
CY2022	us-gaap	Operating Lease Payments OperatingLeasePayments	1194000	usd
CY2023	fnwb	Rightofuse Asset Obtained In Exchange For New Operating Lease Liability RightofuseAssetObtainedInExchangeForNewOperatingLeaseLiability	152000	usd
CY2022	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2022Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.024	pure
CY2022Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.024	pure
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	904000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	944000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	927000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	891000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	705000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	3229000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	7600000	usd
CY2023Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1260000	usd
CY2023Q4	fnwb	Servicing Asset Mortgage Loans Serviced For Third Parties ServicingAssetMortgageLoansServicedForThirdParties	366100000	usd
CY2022Q4	fnwb	Servicing Asset Mortgage Loans Serviced For Third Parties ServicingAssetMortgageLoansServicedForThirdParties	418700000	usd
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	3887000	usd
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	3282000	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Other Changes That Affect Balance Amount ServicingAssetAtAmortizedValueOtherChangesThatAffectBalanceAmount	0	usd
CY2022	us-gaap	Servicing Asset At Amortized Value Other Changes That Affect Balance Amount ServicingAssetAtAmortizedValueOtherChangesThatAffectBalanceAmount	538000	usd
CY2023	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	149000	usd
CY2022	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	54000	usd
CY2023	fnwb	Servicing Asset At Amortized Cost Change In Fair Value ServicingAssetAtAmortizedCostChangeInFairValue	-243000	usd
CY2022	fnwb	Servicing Asset At Amortized Cost Change In Fair Value ServicingAssetAtAmortizedCostChangeInFairValue	13000	usd
CY2023Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	3793000	usd
CY2022Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	3887000	usd
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.074	pure
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.083	pure
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P6Y7M6D
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P6Y
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.117	pure
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.133	pure
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3800000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3900000	usd
CY2023	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	916000	usd
CY2022	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	972000	usd
CY2023	us-gaap	Late Fee Income Generated By Servicing Financial Assets Amount LateFeeIncomeGeneratedByServicingFinancialAssetsAmount	9000	usd
CY2022	us-gaap	Late Fee Income Generated By Servicing Financial Assets Amount LateFeeIncomeGeneratedByServicingFinancialAssetsAmount	12000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3793000	usd
CY2022Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3887000	usd
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.074	pure
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.083	pure
CY2023	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.117	pure
CY2022	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.133	pure
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	252083000	usd
CY2022Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	315083000	usd
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	169418000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit Demand WeightedAverageRateDomesticDepositDemand	0.0056	pure
CY2022Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	193558000	usd
CY2022Q4	us-gaap	Weighted Average Rate Domestic Deposit Demand WeightedAverageRateDomesticDepositDemand	0.0001	pure
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	362205000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0178	pure
CY2022Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	473009000	usd
CY2022Q4	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0058	pure
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	242148000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0162	pure
CY2022Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	200920000	usd
CY2022Q4	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0026	pure
CY2023Q4	fnwb	Time Deposits Retail TimeDepositsRetail	443412000	usd
CY2023Q4	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Retail WeightedAverageRateDomesticDepositCertificatesOfDepositRetail	0.0404	pure
CY2022Q4	fnwb	Time Deposits Retail TimeDepositsRetail	247824000	usd
CY2022Q4	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Retail WeightedAverageRateDomesticDepositCertificatesOfDepositRetail	0.0203	pure
CY2023Q4	fnwb	Time Deposits Brokered TimeDepositsBrokered	207626000	usd
CY2023Q4	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Brokered WeightedAverageRateDomesticDepositCertificatesOfDepositBrokered	0.0485	pure
CY2022Q4	fnwb	Time Deposits Brokered TimeDepositsBrokered	133861000	usd
CY2022Q4	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Brokered WeightedAverageRateDomesticDepositCertificatesOfDepositBrokered	0.0246	pure
CY2023Q4	us-gaap	Deposits Deposits	1676892000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0234	pure
CY2022Q4	us-gaap	Deposits Deposits	1564255000	usd
CY2022Q4	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0074	pure
CY2023Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	173800000	usd
CY2022Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	96600000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Next Rolling Twelve Months TimeDepositMaturitiesNextRollingTwelveMonths	495605000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Two TimeDepositMaturitiesRollingYearTwo	79537000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Three TimeDepositMaturitiesRollingYearThree	28881000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Four TimeDepositMaturitiesRollingYearFour	24198000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Five TimeDepositMaturitiesRollingYearFive	22817000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	651038000	usd
CY2023Q4	fnwb	Deposits Public Fund DepositsPublicFund	114200000	usd
CY2022Q4	fnwb	Deposits Public Fund DepositsPublicFund	93300000	usd
CY2023Q4	fnwb	Deposits Funds Held By Federally Recognized Tribes DepositsFundsHeldByFederallyRecognizedTribes	18400000	usd
CY2022Q4	fnwb	Deposits Funds Held By Federally Recognized Tribes DepositsFundsHeldByFederallyRecognizedTribes	10300000	usd
CY2023	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	796000	usd
CY2022	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	137000	usd
CY2023	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	4217000	usd
CY2022	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	1698000	usd
CY2023	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	3019000	usd
CY2022	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	165000	usd
CY2023	fnwb	Interest Expense Time Deposits Retail InterestExpenseTimeDepositsRetail	12520000	usd
CY2022	fnwb	Interest Expense Time Deposits Retail InterestExpenseTimeDepositsRetail	2090000	usd
CY2023	fnwb	Interest Expense Time Deposits Brokered InterestExpenseTimeDepositsBrokered	6467000	usd
CY2022	fnwb	Interest Expense Time Deposits Brokered InterestExpenseTimeDepositsBrokered	1108000	usd
CY2023	us-gaap	Interest Expense Deposits InterestExpenseDeposits	27019000	usd
CY2022	us-gaap	Interest Expense Deposits InterestExpenseDeposits	5198000	usd
CY2023Q4	fnwb	Federal Home Loan Bank Advances Maximum Available Credit To Bank Assets Percentage FederalHomeLoanBankAdvancesMaximumAvailableCreditToBankAssetsPercentage	0.45	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	896100000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	753600000	usd
CY2023Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	60000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	80000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	80000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	0	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate	10000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRateUnderOneYear	195000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRateUnderOneYear	144000000	usd
CY2023Q4	us-gaap	Line Of Credit LineOfCredit	6500000	usd
CY2022Q4	us-gaap	Line Of Credit LineOfCredit	12000000	usd
CY2023Q4	us-gaap	Subordinated Debt SubordinatedDebt	39436000	usd
CY2022Q4	us-gaap	Subordinated Debt SubordinatedDebt	39358000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Next Rolling Twelve Months FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths	25000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0276	pure
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Next Rolling Twelve Months FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths	15000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0.0154	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Two FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearTwo	30000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0193	pure
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Two FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearTwo	15000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0147	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Three FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearThree	15000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0155	pure
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Three FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearThree	25000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0142	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Four FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFour	10000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0176	pure
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Four FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFour	15000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0155	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Five FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFive	0	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Four To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate	0	pure
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Five FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFive	10000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Four To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate	0.0176	pure
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	80000000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0209	pure
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	80000000	usd
CY2022Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0152	pure
CY2023	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	415000	usd
CY2022	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4376000	usd
CY2023	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	134000	usd
CY2022	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1529000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	549000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2847000	usd
CY2023	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2023	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	562000	usd
CY2022	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3432000	usd
CY2023	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	5000	usd
CY2022	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	0	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	25000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Credits Investment IncomeTaxReconciliationTaxCreditsInvestment	-0	usd
CY2023	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	63000	usd
CY2022	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	183000	usd
CY2023	fnwb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeAmount	195000	usd
CY2022	fnwb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeAmount	505000	usd
CY2023	fnwb	Effective Income Tax Rate Reconciliation Fdic Penalty Amount EffectiveIncomeTaxRateReconciliationFdicPenaltyAmount	151000	usd
CY2022	fnwb	Effective Income Tax Rate Reconciliation Fdic Penalty Amount EffectiveIncomeTaxRateReconciliationFdicPenaltyAmount	0	usd
CY2023	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	114000	usd
CY2022	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	103000	usd
CY2023	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	549000	usd
CY2022	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2847000	usd
CY2023Q4	fnwb	Retaining Earnings Federal Income Taxes Not Provided RetainingEarningsFederalIncomeTaxesNotProvided	6400000	usd
CY2023Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	usd
CY2023	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	3932000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	3528000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	8674000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Unrealized Losses On Availablefor Sale Securities Gross DeferredTaxAssetsUnrealizedLossesOnAvailableforSaleSecuritiesGross	10432000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	432000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	368000	usd
CY2023Q4	fnwb	Deferred Tax Assets Nonaccrual Loans DeferredTaxAssetsNonaccrualLoans	2000	usd
CY2022Q4	fnwb	Deferred Tax Assets Nonaccrual Loans DeferredTaxAssetsNonaccrualLoans	0	usd
CY2023Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	168000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	160000	usd
CY2023Q4	fnwb	Deferred Tax Assets Restricted Stock Awards DeferredTaxAssetsRestrictedStockAwards	297000	usd
CY2022Q4	fnwb	Deferred Tax Assets Restricted Stock Awards DeferredTaxAssetsRestrictedStockAwards	319000	usd
CY2023Q4	fnwb	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	1379000	usd
CY2022Q4	fnwb	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	1507000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1317000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	1111000	usd
CY2023Q4	fnwb	Deferred Tax Assets Retention Credit Benefit DeferredTaxAssetsRetentionCreditBenefit	1009000	usd
CY2022Q4	fnwb	Deferred Tax Assets Retention Credit Benefit DeferredTaxAssetsRetentionCreditBenefit	1168000	usd
CY2023Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	17210000	usd
CY2022Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	18593000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	1027000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	1126000	usd
CY2023Q4	fnwb	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	0	usd
CY2022Q4	fnwb	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	374000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	706000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	864000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	510000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	424000	usd
CY2023Q4	fnwb	Deferred Tax Liabilities Defined Benefit Plan DeferredTaxLiabilitiesDefinedBenefitPlan	576000	usd
CY2022Q4	fnwb	Deferred Tax Liabilities Defined Benefit Plan DeferredTaxLiabilitiesDefinedBenefitPlan	42000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	1298000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	1435000	usd
CY2023Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	92000	usd
CY2022Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	237000	usd
CY2023Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4209000	usd
CY2022Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4502000	usd
CY2023Q4	fnwb	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	13001000	usd
CY2022Q4	fnwb	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	14091000	usd
CY2022	fnwb	Defined Benefit Planf Prior Service Cost Credit Amortization Period DefinedBenefitPlanfPriorServiceCostCreditAmortizationPeriod	P15Y
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	1980000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	750000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	630000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	670000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	640000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	3480000	usd
CY2023Q4	fnwb	Defined Benefit Plan Expected Future Benefit Payment Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentThereafter	2248000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	10398000	usd
CY2023Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	10923000	usd
CY2022Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	10813000	usd
	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1	pure
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50	pure
	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06	pure
CY2023	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	566000	usd
CY2022	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	634000	usd
	fnwb	Employee Stock Ownership Plan Esop Requisite Service Period EmployeeStockOwnershipPlanEsopRequisiteServicePeriod	P12M
CY2023Q4	fnwb	Employee Stock Ownership Plan Esop Shares To Be Purchased Percentage EmployeeStockOwnershipPlanEsopSharesToBePurchasedPercentage	0.08	pure
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2023Q4	fnwb	Employee Stock Ownership Plan Esop Number Of Shares Purchased Percentage EmployeeStockOwnershipPlanEsopNumberOfSharesPurchasedPercentage	1	pure
CY2023	us-gaap	Employee Stock Ownership Plan Esop Weighted Average Purchase Price Of Shares Purchased EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased	12.45
CY2023	fnwb	Employee Stock Ownership Plan Esop Debt Structure Amortization Period EmployeeStockOwnershipPlanEsopDebtStructureAmortizationPeriod	P20Y
CY2023Q4	fnwb	Employee Stock Ownership Plan Esop Debt Structure Estimated Interest Rate EmployeeStockOwnershipPlanEsopDebtStructureEstimatedInterestRate	0.0246	pure
CY2023	fnwb	Employee Stock Ownership Plan Esop Principal And Interest Payments From Esop EmployeeStockOwnershipPlanEsopPrincipalAndInterestPaymentsFromEsop	835000	usd
CY2023	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	418000	usd
CY2022	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	673000	usd
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	439174
CY2022Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	386285
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	26514
CY2022Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	26442
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	582341
CY2022Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	635302
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2022Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	9283000	usd
CY2022Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	9758000	usd
CY2015Q1	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045	pure
CY2015Q1	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06	pure
CY2015Q1	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08	pure
CY2015Q1	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04	pure
CY2019Q1	fnwb	Excess Tier One Common Equity Capital Conservation Buffer ExcessTierOneCommonEquityCapitalConservationBuffer	0.025	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	214049000	usd
CY2023Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1312	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	73407000	usd
CY2023Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	106032000	usd
CY2023Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	214049000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1312	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	97876000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	130501000	usd
CY2023Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2023Q4	us-gaap	Capital Capital	230163000	usd
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1411	pure
CY2023Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	130501000	usd
CY2023Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08	pure
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	163127000	usd
CY2023Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2023Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	214049000	usd
CY2023Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.099	pure
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	86508000	usd
CY2023Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04	pure
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	108135000	usd
CY2023Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05	pure
CY2022Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	215037000	usd
CY2022Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.134	pure
CY2022Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	72230000	usd
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045	pure
CY2022Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	104332000	usd
CY2022Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.065	pure
CY2022Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	215037000	usd
CY2022Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.134	pure
CY2022Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	96306000	usd
CY2022Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.06	pure
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	128408000	usd
CY2022Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.08	pure
CY2022Q4	us-gaap	Capital Capital	231405000	usd
CY2022Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1442	pure
CY2022Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	128408000	usd
CY2022Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.08	pure
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	160510000	usd
CY2022Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.10	pure
CY2022Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	215037000	usd
CY2022Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1041	pure
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	82607000	usd
CY2022Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.04	pure
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	103259000	usd
CY2022Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.05	pure
CY2023Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	4500000	usd
CY2022Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	2200000	usd
CY2023	us-gaap	Net Income Loss NetIncomeLoss	2286000	usd
CY2022	us-gaap	Net Income Loss NetIncomeLoss	15645000	usd
CY2023	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	11000	usd
CY2022	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	141000	usd
CY2023	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2275000	usd
CY2022	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	15504000	usd
CY2023	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	9655499
CY2022	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	9956823
CY2023	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	135108
CY2022	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	219776
CY2023	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	602107
CY2022	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	655015
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8918284
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9082032
CY2023	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8918284
CY2022	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9082032
CY2023	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	22896
CY2022	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	61583
CY2023	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	8941180
CY2022	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9143615
CY2023	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.26
CY2022	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.71
CY2023	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.26
CY2022	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.71
CY2023	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	10965
CY2022	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3460
CY2023Q4	us-gaap	Credit Risk Derivatives At Fair Value Net CreditRiskDerivativesAtFairValueNet	1100000	usd
CY2023Q4	us-gaap	Derivative Notional Amount DerivativeNotionalAmount	50000000	usd

Files In Submission

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0001437749-24-008142-index-headers.html	Edgar Link	pending
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$FNWB
First Northwest Bancorp Stock $fnwb

2024 Q1 Form 10-K Financial Statement

#000143774924008142 Filed on March 15, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

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$FNWB First Northwest Bancorp Stock $fnwb

2024 Q1 Form 10-K Financial Statement

#000143774924008142 Filed on March 15, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNWB
First Northwest Bancorp Stock $fnwb