$FNWB
First Northwest Bancorp Stock $fnwb

$fnwb Overview Financials Valuation SEC Filings Company Website

2024 Q4 Form 10-Q Financial Statement

#000143774924034591 Filed on November 12, 2024

Income Statement

Concept	2024 Q4	2024 Q3	2023 Q3
Revenue		$28.21M	$25.83M
YoY Change		9.18%	23.87%
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		$346.0K	$400.0K
YoY Change		-13.5%	-29.45%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense			$10.88M
YoY Change			310.56%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income		-$3.183M	$3.107M
YoY Change		-202.45%	-29.59%
Income Tax		-$1.203M	$603.0K
% Of Pretax Income			19.41%
Net Earnings		-$1.980M	$2.504M
YoY Change		-179.07%	-41.65%
Net Earnings / Revenue		-7.02%	9.69%
Basic Earnings Per Share		-$0.23	$0.28
Diluted Earnings Per Share		-$0.23	$0.28
COMMON SHARES
Basic Shares Outstanding	9.361M	9.443M	9.632M
Diluted Shares Outstanding		8.757M	8.935M

Balance Sheet

Concept	2024 Q3	2023 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$82.72M	$83.89M
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	$10.44M	$17.95M
YoY Change	-41.87%	-13.85%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$10.80M	$16.60M
YoY Change	-34.93%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$2.255B	$2.154B
YoY Change	4.73%	2.97%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$2.153M	$2.300M
YoY Change	-6.39%	2090.48%
Accrued Expenses	$43.42M	$34.70M
YoY Change	25.14%	-0.69%
Deferred Revenue
YoY Change
Short-Term Debt	$5.500M	$8.000M
YoY Change	-31.25%	-33.33%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$51.08M	$45.00M
YoY Change	13.5%	28.41%
LONG-TERM LIABILITIES
Long-Term Debt	$39.49M	$39.40M
YoY Change	0.24%
Other Long-Term Liabilities	$2.485M	$2.400M
YoY Change	3.54%	7.91%
Total Long-Term Liabilities	$41.98M	$41.80M
YoY Change	0.43%	1779.5%
TOTAL LIABILITIES
Total Short-Term Liabilities	$51.08M	$45.00M
Total Long-Term Liabilities	$41.98M	$41.80M
Total Liabilities	$2.095B	$1.997B
YoY Change	4.87%	3.24%
SHAREHOLDERS EQUITY
Retained Earnings	$100.7M	$113.6M
YoY Change	-11.37%	3.15%
Common Stock	$94.00K	$96.00K
YoY Change	-2.08%	-4.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$160.8M	$156.1M
YoY Change
Total Liabilities & Shareholders Equity	$2.255B	$2.154B
YoY Change	4.73%	2.97%

Cashflow Statement

Concept	2024 Q3	2023 Q3
OPERATING ACTIVITIES
Net Income	-$1.980M	$2.504M
YoY Change	-179.07%	-41.65%
Depreciation, Depletion And Amortization	$346.0K	$400.0K
YoY Change	-13.5%	-29.45%
Cash From Operating Activities	$1.121M	-$2.500M
YoY Change	-144.84%	-156.08%
INVESTING ACTIVITIES
Capital Expenditures		$220.0K
YoY Change		-292.98%
Acquisitions
YoY Change
Other Investing Activities	-$36.84M	$5.810M
YoY Change	-734.04%	-110.52%
Cash From Investing Activities	-$36.84M	$5.590M
YoY Change	-759.0%	-110.1%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	35.26M	2.140M
YoY Change	1547.66%	-96.79%
NET CHANGE
Cash From Operating Activities	1.121M	-2.500M
Cash From Investing Activities	-36.84M	5.590M
Cash From Financing Activities	35.26M	2.140M
Net Change In Cash	-457.0K	5.230M
YoY Change	-108.74%	-67.04%
FREE CASH FLOW
Cash From Operating Activities	$1.121M	-$2.500M
Capital Expenditures		$220.0K
Free Cash Flow		-$2.720M
YoY Change		-159.49%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Registrant Name EntityRegistrantName	First Northwest Bancorp
	dei	Entity Central Index Key EntityCentralIndexKey	0001556727
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	341011000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	333950000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	21970000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	17510000	usd
CY2024Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2024Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2024Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2024Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2024Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2024Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
CY2024Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	9365979
CY2024Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	9365979
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	9611876
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	9611876
CY2023Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.07
CY2024Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.07
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.21
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.21
CY2024Q3	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	usd
CY2023Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2024Q3	fnwb	Employee Stock Ownership Plan Esop Minimum Service Period Hours EmployeeStockOwnershipPlanEsopMinimumServicePeriodHours	1000	pure
CY2024Q3	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2024-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-36741
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	WA
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	46-1259100
	dei	Entity Address Address Line1 EntityAddressAddressLine1	105 West 8th Street
	dei	Entity Address City Or Town EntityAddressCityOrTown	Port Angeles
	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98362
	dei	City Area Code CityAreaCode	360
	dei	Local Phone Number LocalPhoneNumber	457-0461
	dei	Security12b Title Security12bTitle	Common Stock, par value $0.01 per share
	dei	Trading Symbol TradingSymbol	FNWB
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Filer Category EntityFilerCategory	Non-accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	true
	dei	Entity Shell Company EntityShellCompany	false
CY2024Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	9360666
CY2024Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	17953000	usd
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	19845000	usd
CY2024Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	64769000	usd
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	103324000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	310860000	usd
CY2023Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	295623000	usd
CY2024Q3	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	378000	usd
CY2023Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	753000	usd
CY2024Q3	us-gaap	Notes Receivable Net NotesReceivableNet	1714416000	usd
CY2023Q4	us-gaap	Notes Receivable Net NotesReceivableNet	1642518000	usd
CY2024Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	14435000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	13664000	usd
CY2024Q3	us-gaap	Interest Receivable InterestReceivable	8939000	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	7894000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10436000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	18049000	usd
CY2024Q3	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3584000	usd
CY2023Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3793000	usd
CY2024Q3	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	41429000	usd
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	40578000	usd
CY2024Q3	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	14912000	usd
CY2023Q4	us-gaap	Equity Securities Fv Ni Current And Noncurrent EquitySecuritiesFvNiCurrentAndNoncurrent	14794000	usd
CY2024Q3	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	1083000	usd
CY2023Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	1086000	usd
CY2024Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	10802000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	13001000	usd
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	17315000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6047000	usd
CY2024Q3	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	24175000	usd
CY2023Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	20828000	usd
CY2024Q3	us-gaap	Assets Assets	2255486000	usd
CY2023Q4	us-gaap	Assets Assets	2201797000	usd
CY2024Q3	us-gaap	Deposits Deposits	1711641000	usd
CY2023Q4	us-gaap	Deposits Deposits	1676892000	usd
CY2024Q3	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	334994000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	320936000	usd
CY2024Q3	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	2153000	usd
CY2023Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	3396000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	17799000	usd
CY2023Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	6428000	usd
CY2024Q3	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	25625000	usd
CY2023Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	29545000	usd
CY2024Q3	us-gaap	Advance Payments By Borrowers For Taxes And Insurance AdvancePaymentsByBorrowersForTaxesAndInsurance	2485000	usd
CY2023Q4	us-gaap	Advance Payments By Borrowers For Taxes And Insurance AdvancePaymentsByBorrowersForTaxesAndInsurance	1260000	usd
CY2024Q3	us-gaap	Liabilities Liabilities	2094697000	usd
CY2023Q4	us-gaap	Liabilities Liabilities	2038457000	usd
CY2024Q3	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2023Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	usd
CY2024Q3	us-gaap	Common Stock Value CommonStockValue	94000	usd
CY2023Q4	us-gaap	Common Stock Value CommonStockValue	96000	usd
CY2024Q3	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	93218000	usd
CY2023Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	95784000	usd
CY2024Q3	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	100660000	usd
CY2023Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	107349000	usd
CY2024Q3	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-26424000	usd
CY2023Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-32636000	usd
CY2024Q3	fnwb	Unearned Esop Shares Cost UnearnedESOPSharesCost	6759000	usd
CY2023Q4	fnwb	Unearned Esop Shares Cost UnearnedESOPSharesCost	7253000	usd
CY2024Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	160789000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	163340000	usd
CY2024Q3	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2255486000	usd
CY2023Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	2201797000	usd
CY2024Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	23536000	usd
CY2023Q3	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	21728000	usd
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	70036000	usd
	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	62531000	usd
CY2024Q3	us-gaap	Interest Income Debt Securities Operating InterestIncomeDebtSecuritiesOperating	3786000	usd
CY2023Q3	us-gaap	Interest Income Debt Securities Operating InterestIncomeDebtSecuritiesOperating	3368000	usd
	us-gaap	Interest Income Debt Securities Operating InterestIncomeDebtSecuritiesOperating	11367000	usd
	us-gaap	Interest Income Debt Securities Operating InterestIncomeDebtSecuritiesOperating	9886000	usd
CY2024Q3	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	582000	usd
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	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1798000	usd
	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	1545000	usd
CY2024Q3	fnwb	Dividend Income Operating Federal Home Loan Bank DividendIncomeOperatingFederalHomeLoanBank	302000	usd
CY2023Q3	fnwb	Dividend Income Operating Federal Home Loan Bank DividendIncomeOperatingFederalHomeLoanBank	214000	usd
	fnwb	Dividend Income Operating Federal Home Loan Bank DividendIncomeOperatingFederalHomeLoanBank	942000	usd
	fnwb	Dividend Income Operating Federal Home Loan Bank DividendIncomeOperatingFederalHomeLoanBank	628000	usd
CY2024Q3	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	28206000	usd
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	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	84143000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	74590000	usd
CY2024Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	10960000	usd
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	us-gaap	Interest Expense Deposits InterestExpenseDeposits	31252000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	18261000	usd
CY2024Q3	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	3226000	usd
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	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	10708000	usd
	us-gaap	Interest Expense Borrowings InterestExpenseBorrowings	9092000	usd
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	us-gaap	Interest Expense Operating InterestExpenseOperating	41960000	usd
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CY2024Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	14020000	usd
CY2023Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	14950000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	42183000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	47237000	usd
CY2024Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3077000	usd
CY2023Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	880000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	12956000	usd
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CY2024Q3	fnwb	Recapture Of Provision For Credit Losses On Unfunded Commitments RecaptureOfProvisionForCreditLossesOnUnfundedCommitments	57000	usd
CY2023Q3	fnwb	Recapture Of Provision For Credit Losses On Unfunded Commitments RecaptureOfProvisionForCreditLossesOnUnfundedCommitments	-509000	usd
	fnwb	Recapture Of Provision For Credit Losses On Unfunded Commitments RecaptureOfProvisionForCreditLossesOnUnfundedCommitments	-113000	usd
	fnwb	Recapture Of Provision For Credit Losses On Unfunded Commitments RecaptureOfProvisionForCreditLossesOnUnfundedCommitments	-1024000	usd
CY2024Q3	fnwb	Financing Receivable Credit Loss Expense Reversal Including Unfunded Commitments FinancingReceivableCreditLossExpenseReversalIncludingUnfundedCommitments	3134000	usd
CY2023Q3	fnwb	Financing Receivable Credit Loss Expense Reversal Including Unfunded Commitments FinancingReceivableCreditLossExpenseReversalIncludingUnfundedCommitments	371000	usd
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	fnwb	Financing Receivable Credit Loss Expense Reversal Including Unfunded Commitments FinancingReceivableCreditLossExpenseReversalIncludingUnfundedCommitments	171000	usd
CY2024Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	10886000	usd
CY2023Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	14579000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	29340000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	47066000	usd
CY2024Q3	us-gaap	Revenue Not From Contract With Customer Excluding Interest Income RevenueNotFromContractWithCustomerExcludingInterestIncome	1059000	usd
CY2023Q3	us-gaap	Revenue Not From Contract With Customer Excluding Interest Income RevenueNotFromContractWithCustomerExcludingInterestIncome	1068000	usd
	us-gaap	Revenue Not From Contract With Customer Excluding Interest Income RevenueNotFromContractWithCustomerExcludingInterestIncome	3237000	usd
	us-gaap	Revenue Not From Contract With Customer Excluding Interest Income RevenueNotFromContractWithCustomerExcludingInterestIncome	3273000	usd
CY2024Q3	fnwb	Fees And Commissions Mortgage Banking And Servicing Net Of Amortization FeesAndCommissionsMortgageBankingAndServicingNetOfAmortization	10000	usd
CY2023Q3	fnwb	Fees And Commissions Mortgage Banking And Servicing Net Of Amortization FeesAndCommissionsMortgageBankingAndServicingNetOfAmortization	98000	usd
	fnwb	Fees And Commissions Mortgage Banking And Servicing Net Of Amortization FeesAndCommissionsMortgageBankingAndServicingNetOfAmortization	303000	usd
	fnwb	Fees And Commissions Mortgage Banking And Servicing Net Of Amortization FeesAndCommissionsMortgageBankingAndServicingNetOfAmortization	400000	usd
CY2024Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	58000	usd
CY2023Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	171000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	260000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	405000	usd
CY2024Q3	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	0	usd
CY2023Q3	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	0	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-2117000	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	0	usd
CY2024Q3	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	usd
CY2023Q3	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	usd
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	7919000	usd
	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	0	usd
CY2024Q3	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	315000	usd
CY2023Q3	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	252000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	851000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	668000	usd
CY2024Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	337000	usd
CY2023Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	1315000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	861000	usd
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2203000	usd
CY2024Q3	us-gaap	Noninterest Income NoninterestIncome	1779000	usd
CY2023Q3	us-gaap	Noninterest Income NoninterestIncome	2904000	usd
	us-gaap	Noninterest Income NoninterestIncome	11314000	usd
	us-gaap	Noninterest Income NoninterestIncome	6949000	usd
CY2024Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	8582000	usd
CY2023Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	7795000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	25298000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	23812000	usd
CY2024Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2085000	usd
CY2023Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1945000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6037000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6063000	usd
CY2024Q3	us-gaap	Occupancy Net OccupancyNet	1553000	usd
CY2023Q3	us-gaap	Occupancy Net OccupancyNet	1173000	usd
	us-gaap	Occupancy Net OccupancyNet	4592000	usd
	us-gaap	Occupancy Net OccupancyNet	3596000	usd
CY2024Q3	fnwb	Supplies Postage And Telephone Expense SuppliesPostageAndTelephoneExpense	360000	usd
CY2023Q3	fnwb	Supplies Postage And Telephone Expense SuppliesPostageAndTelephoneExpense	292000	usd
	fnwb	Supplies Postage And Telephone Expense SuppliesPostageAndTelephoneExpense	970000	usd
	fnwb	Supplies Postage And Telephone Expense SuppliesPostageAndTelephoneExpense	1082000	usd
CY2024Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	548000	usd
CY2023Q3	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	446000	usd
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1518000	usd
	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1259000	usd
CY2024Q3	us-gaap	Advertising Expense AdvertisingExpense	409000	usd
CY2023Q3	us-gaap	Advertising Expense AdvertisingExpense	501000	usd
	us-gaap	Advertising Expense AdvertisingExpense	1095000	usd
	us-gaap	Advertising Expense AdvertisingExpense	2471000	usd
CY2024Q3	us-gaap	Professional Fees ProfessionalFees	698000	usd
CY2023Q3	us-gaap	Professional Fees ProfessionalFees	929000	usd
	us-gaap	Professional Fees ProfessionalFees	2292000	usd
	us-gaap	Professional Fees ProfessionalFees	2619000	usd
CY2024Q3	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	533000	usd
CY2023Q3	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	369000	usd
	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	1392000	usd
	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	939000	usd
CY2024Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	1080000	usd
CY2023Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	926000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2566000	usd
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2623000	usd
CY2024Q3	us-gaap	Noninterest Expense NoninterestExpense	15848000	usd
CY2023Q3	us-gaap	Noninterest Expense NoninterestExpense	14376000	usd
	us-gaap	Noninterest Expense NoninterestExpense	45760000	usd
	us-gaap	Noninterest Expense NoninterestExpense	44464000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-3183000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	3107000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-5106000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9551000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1203000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	603000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-1303000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1903000	usd
CY2024Q3	us-gaap	Profit Loss ProfitLoss	-1980000	usd
CY2023Q3	us-gaap	Profit Loss ProfitLoss	2504000	usd
	us-gaap	Profit Loss ProfitLoss	-3803000	usd
	us-gaap	Profit Loss ProfitLoss	7648000	usd
CY2024Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-0	usd
CY2023Q3	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-0	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-0	usd
	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-160000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	-1980000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	2504000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-3803000	usd
	us-gaap	Net Income Loss NetIncomeLoss	7808000	usd
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.23
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.43
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2024Q3	us-gaap	Profit Loss ProfitLoss	-1980000	usd
CY2023Q3	us-gaap	Profit Loss ProfitLoss	2504000	usd
	us-gaap	Profit Loss ProfitLoss	-3803000	usd
	us-gaap	Profit Loss ProfitLoss	7648000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	8076000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-8327000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	6059000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-7688000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1732000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1787000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1300000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1873000	usd
CY2024Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-37000	usd
CY2023Q3	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-37000	usd
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-112000	usd
	us-gaap	Defined Benefit Plan Amortization Of Prior Service Cost Credit DefinedBenefitPlanAmortizationOfPriorServiceCostCredit	-113000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	-8000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	-8000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	-24000	usd
	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	-24000	usd
CY2024Q3	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationBeforeTax	-1527000	usd
CY2023Q3	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationBeforeTax	925000	usd
	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationBeforeTax	-379000	usd
	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Before Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationBeforeTax	533000	usd
CY2024Q3	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationTax	-327000	usd
CY2023Q3	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationTax	198000	usd
	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationTax	-81000	usd
	fnwb	Other Comprehensive Income Loss Fair Value Hedge Gain Loss After Reclassification Tax OtherComprehensiveIncomeLossFairValueHedgeGainLossAfterReclassificationTax	114000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-0	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-2117000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-0	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-454000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5173000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5784000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6212000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5307000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	3193000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	-3280000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2409000	usd
	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	2341000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	usd
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	usd
	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-160000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	3193000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	-3280000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2409000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	2501000	usd
CY2023Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	159557000	usd
CY2023Q3	us-gaap	Profit Loss ProfitLoss	2504000	usd
CY2023Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	12000	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	43000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5784000	usd
CY2023Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	349000	usd
CY2023Q3	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	167000	usd
CY2023Q3	us-gaap	Dividends Cash DividendsCash	673000	usd
CY2023Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	156065000	usd
CY2024Q2	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	158881000	usd
CY2024Q3	us-gaap	Profit Loss ProfitLoss	-1980000	usd
CY2024Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	1014000	usd
CY2024Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2024Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	8000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	5173000	usd
CY2024Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	260000	usd
CY2024Q3	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	136000	usd
CY2024Q3	us-gaap	Dividends Cash DividendsCash	659000	usd
CY2024Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	160789000	usd
CY2022Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	158282000	usd
	us-gaap	Profit Loss ProfitLoss	7648000	usd
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	980000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	205000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5307000	usd
	fnwb	Close Out Of Investment CloseOutOfInvestment	-0	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1098000	usd
	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	507000	usd
	us-gaap	Dividends Cash DividendsCash	2027000	usd
CY2023Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	156065000	usd
CY2023Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	163340000	usd
	us-gaap	Profit Loss ProfitLoss	-3803000	usd
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	4057000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	174000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6212000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	781000	usd
	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	481000	usd
	us-gaap	Dividends Cash DividendsCash	1991000	usd
CY2024Q3	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	160789000	usd
	us-gaap	Profit Loss ProfitLoss	-3803000	usd
	us-gaap	Profit Loss ProfitLoss	7648000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1091000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1201000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	3000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-459000	usd
	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1078000	usd
	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	1133000	usd
	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	451000	usd
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	58000	usd
	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	58000	usd
	fnwb	Fair Value Adjustment Of Sold Loan Servicing Rights FairValueAdjustmentOfSoldLoanServicingRights	247000	usd
	fnwb	Fair Value Adjustment Of Sold Loan Servicing Rights FairValueAdjustmentOfSoldLoanServicingRights	303000	usd
	fnwb	Servicing Asset At Fair Value Additions Net ServicingAssetAtFairValueAdditionsNet	-38000	usd
	fnwb	Servicing Asset At Fair Value Additions Net ServicingAssetAtFairValueAdditionsNet	-145000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	12956000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1195000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-113000	usd
	us-gaap	Off Balance Sheet Credit Loss Liability Credit Loss Expense Reversal OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal	-1024000	usd
	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	481000	usd
	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	507000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	781000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1098000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	260000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	405000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-2117000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	-0	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	851000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	668000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	13553000	usd
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	21351000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	14188000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	21664000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1045000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	1350000	usd
	fnwb	Increase Decrease In Right Of Use Asset IncreaseDecreaseInRightOfUseAsset	11268000	usd
	fnwb	Increase Decrease In Right Of Use Asset IncreaseDecreaseInRightOfUseAsset	-433000	usd
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	396000	usd
	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-1718000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-1243000	usd
	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	1821000	usd
	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	11371000	usd
	us-gaap	Increase Decrease In Operating Lease Liability IncreaseDecreaseInOperatingLeaseLiability	-399000	usd
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-5654000	usd
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	2359000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	4395000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15292000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	53027000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	-0	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	22345000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	8480000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	21048000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Held To Maturity Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfHeldToMaturitySecurities	0	usd
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	771000	usd
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	940000	usd
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	6140000	usd
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	-0	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	6140000	usd
	us-gaap	Proceeds From Life Insurance Policies ProceedsFromLifeInsurancePolicies	15000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	83721000	usd
	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	89551000	usd
	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	-6521000	usd
	us-gaap	Payments For Proceeds From Productive Assets PaymentsForProceedsFromProductiveAssets	1066000	usd
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	6386000	usd
	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	335000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	6782000	usd
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	99000	usd
	fnwb	Payments To Acquire Lowincome Housing Tax Credit Partnerships PaymentsToAcquireLowincomeHousingTaxCreditPartnerships	1387000	usd
	fnwb	Payments To Acquire Lowincome Housing Tax Credit Partnerships PaymentsToAcquireLowincomeHousingTaxCreditPartnerships	-0	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-88596000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-83298000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	34749000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	93507000	usd
	fnwb	Proceeds From Fhl Bank Advance Financing Activities ProceedsFromFHLBankAdvanceFinancingActivities	105000000	usd
	fnwb	Proceeds From Fhl Bank Advance Financing Activities ProceedsFromFHLBankAdvanceFinancingActivities	15000000	usd
	fnwb	Payments Of Fhlbank Borrowings Financing Activities Longterm PaymentsOfFhlbankBorrowingsFinancingActivitiesLongterm	25000000	usd
	fnwb	Payments Of Fhlbank Borrowings Financing Activities Longterm PaymentsOfFhlbankBorrowingsFinancingActivitiesLongterm	15000000	usd
	fnwb	Payments Of Fhlbank Borrowings Financing Activities Shortterm PaymentsOfFhlbankBorrowingsFinancingActivitiesShortterm	65000000	usd
	fnwb	Payments Of Fhlbank Borrowings Financing Activities Shortterm PaymentsOfFhlbankBorrowingsFinancingActivitiesShortterm	-19000000	usd
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-1000000	usd
	us-gaap	Proceeds From Repayments Of Lines Of Credit ProceedsFromRepaymentsOfLinesOfCredit	-4000000	usd
	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	1225000	usd
	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	999000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	1989000	usd
	us-gaap	Payments Of Dividends PaymentsOfDividends	2025000	usd
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	174000	usd
	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	205000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	4057000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	980000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	43754000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	106296000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-40447000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	38290000	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
CY2024Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	82722000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	83886000	usd
	us-gaap	Interest Paid Net InterestPaidNet	43203000	usd
	us-gaap	Interest Paid Net InterestPaidNet	25532000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	3000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	1859000	usd
	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	8176000	usd
	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	-7688000	usd
	fnwb	Change In Unrealized Gain Loss Of Plan ChangeInUnrealizedGainLossOfPlan	-379000	usd
	fnwb	Change In Unrealized Gain Loss Of Plan ChangeInUnrealizedGainLossOfPlan	533000	usd
	fnwb	Cumulative Adjustment To Servicing Right Asset Due To Election Of Fair Value Option CumulativeAdjustmentToServicingRightAssetDueToElectionOfFairValueOption	112000	usd
	fnwb	Cumulative Adjustment To Servicing Right Asset Due To Election Of Fair Value Option CumulativeAdjustmentToServicingRightAssetDueToElectionOfFairValueOption	113000	usd
	fnwb	Investment In Low Income Housing Tax Credit Partnership And Related Funding Commitment InvestmentInLowIncomeHousingTaxCreditPartnershipAndRelatedFundingCommitment	0	usd
	fnwb	Investment In Low Income Housing Tax Credit Partnership And Related Funding Commitment InvestmentInLowIncomeHousingTaxCreditPartnershipAndRelatedFundingCommitment	-3735000	usd
	fnwb	Stock Issued To Acquire Investment In Partnership StockIssuedToAcquireInvestmentInPartnership	12158000	usd
	fnwb	Stock Issued To Acquire Investment In Partnership StockIssuedToAcquireInvestmentInPartnership	152000	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
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
	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-size: 10pt; font-family: "Times New Roman", Times, serif; margin: 0pt;"><b>Restatement</b> - On <em style="font: inherit;"> October 21, 2024, </em>the Audit Committee of the Board of Directors (the "Audit Committee") of the Company, based on the recommendation of, and after consultation with, the Company’s management and independent registered public accounting firm, concluded that certain charge-offs of commercial construction loans, commercial business loans and the Splash unsecured consumer loan program as well as increased provision on Splash consumer loans should have been reported in the interim period ending <em style="font: inherit;"> June 30, 2024. </em>On <em style="font: inherit;"> October 25, 2024, </em>the Company filed amendments to its quarterly report for the period ended <em style="font: inherit;"> June 30, 2024 </em>to restate the consolidated financial statements included therein. The consolidated financial statements as of and for the <em style="font: inherit;">nine</em> months ended <em style="font: inherit;"> September 30, 2024</em>, reflect the effects of the restatement as of and for the period ended <em style="font: inherit;"> June 30, 2024.</em></p> <p style="font-size: 10pt; font-family: "Times New Roman", Times, serif; margin: 0pt;"> </p> <p style="font-family: 'Times New Roman', Times, serif; font-size: 10pt; margin: 0pt; text-align: left"></p>
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	341011000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	287000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	30438000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	310860000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
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
CY2023Q4	us-gaap	Debt Securities Available For Sale Allowance For Credit Loss DebtSecuritiesAvailableForSaleAllowanceForCreditLoss	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	2400000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	1900000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	229000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	24200000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	30209000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	242113000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	30438000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	266313000	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
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	10	pure
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	145	pure
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
CY2024Q3	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	341011000	usd
CY2024Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	310860000	usd
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
CY2024Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2023Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	21048000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
CY2023Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-2117000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	0	usd
CY2024Q3	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	19500000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Commitment Origination Fee And Premium Discount FinancingReceivableUnamortizedLoanCommitmentOriginationFeeAndPremiumDiscount	14800000	usd
CY2024Q3	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	6500000	usd
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	6000000	usd
CY2024Q3	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1734807000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1660028000	usd
CY2024Q3	fnwb	Financing Receivable Derivative Basis Adjustment FinancingReceivableDerivativeBasisAdjustment	-1579000	usd
CY2023Q4	fnwb	Financing Receivable Derivative Basis Adjustment FinancingReceivableDerivativeBasisAdjustment	0	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	21970000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	17510000	usd
CY2024Q3	us-gaap	Notes Receivable Net NotesReceivableNet	1714416000	usd
CY2023Q4	us-gaap	Notes Receivable Net NotesReceivableNet	1642518000	usd
CY2024Q3	fnwb	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	2556000	usd
CY2024Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	27820000	usd
CY2024Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	30376000	usd
CY2023Q4	fnwb	Financing Receivable Nonaccrual With Allowance FinancingReceivableNonaccrualWithAllowance	747000	usd
CY2023Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	17897000	usd
CY2023Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	18644000	usd
CY2024Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	1000	usd
CY2023Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	19000	usd
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	35000	usd
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	52000	usd
CY2024Q3	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1734807000	usd
CY2023Q4	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1660028000	usd
CY2024Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	149107000	usd
CY2024Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	228901000	usd
CY2024Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	432679000	usd
CY2024Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	401917000	usd
CY2024Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	218058000	usd
CY2024Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	216667000	usd
CY2024Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	87478000	usd
CY2024Q3	us-gaap	Financing Receivable Before Allowance For Credit Loss And Fee FinancingReceivableBeforeAllowanceForCreditLossAndFee	1734807000	usd
	us-gaap	Financing Receivable Year One Originated Current Fiscal Year Writeoff FinancingReceivableYearOneOriginatedCurrentFiscalYearWriteoff	0	usd
	us-gaap	Financing Receivable Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	4384000	usd
	us-gaap	Financing Receivable Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	2132000	usd
	us-gaap	Financing Receivable Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	1840000	usd
	us-gaap	Financing Receivable Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	156000	usd
	us-gaap	Financing Receivable Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	234000	usd
	us-gaap	Financing Receivable Revolving Writeoff FinancingReceivableRevolvingWriteoff	62000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	8808000	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
CY2024Q3	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	31800000	usd
CY2024Q3	fnwb	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment	2600000	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
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	516000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	66000	usd
CY2024Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	3077000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	21970000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	17510000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	12956000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	21970000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	17297000	usd
CY2023Q3	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	880000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16945000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16116000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	2668000	usd
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	93000	usd
	us-gaap	Provision For Loan Losses Expensed ProvisionForLoanLossesExpensed	1195000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Losses FinancingReceivableAllowanceForCreditLosses	16945000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	23796000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	35618000	usd
CY2024Q3	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	13360000	usd
CY2023Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	17569000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	10436000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	18049000	usd
CY2024Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	346000	usd
CY2023Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	402000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1100000	usd
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1200000	usd
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	17300000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	17800000	usd
	us-gaap	Lease Cost LeaseCost	1600000	usd
	us-gaap	Lease Cost LeaseCost	857000	usd
CY2024Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	700000	usd
CY2023Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	284000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	1564000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	857000	usd
CY2024Q3	fnwb	Rightofuse Asset Obtained In Exchange For New Operating Lease Liability RightofuseAssetObtainedInExchangeForNewOperatingLeaseLiability	0	usd
CY2023Q3	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	152000	usd
	fnwb	Rightofuse Asset Obtained In Exchange For New Operating Lease Liability RightofuseAssetObtainedInExchangeForNewOperatingLeaseLiability	12158000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	152000	usd
CY2024Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y7M6D
CY2023Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P9Y
CY2024Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.072	pure
CY2023Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.024	pure
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	2310000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	2333000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	2321000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2206000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	2106000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	18547000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	29823000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	12095000	usd
CY2024Q3	fnwb	Operating Lease Liabilities Gross OperatingLeaseLiabilitiesGross	17728000	usd
CY2024Q3	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	252999000	usd
CY2023Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	252083000	usd
CY2024Q3	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	167202000	usd
CY2024Q3	us-gaap	Weighted Average Rate Domestic Deposit Demand WeightedAverageRateDomesticDepositDemand	0.006	pure
CY2023Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	169418000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit Demand WeightedAverageRateDomesticDepositDemand	0.0056	pure
CY2024Q3	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	433307000	usd
CY2024Q3	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0318	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
CY2024Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	212763000	usd
CY2024Q3	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0145	pure
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	242148000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0162	pure
CY2024Q3	fnwb	Time Deposits Retail TimeDepositsRetail	441665000	usd
CY2024Q3	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Retail WeightedAverageRateDomesticDepositCertificatesOfDepositRetail	0.0421	pure
CY2023Q4	fnwb	Time Deposits Retail TimeDepositsRetail	443412000	usd
CY2023Q4	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Retail WeightedAverageRateDomesticDepositCertificatesOfDepositRetail	0.0404	pure
CY2024Q3	fnwb	Time Deposits Brokered TimeDepositsBrokered	203705000	usd
CY2024Q3	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Brokered WeightedAverageRateDomesticDepositCertificatesOfDepositBrokered	0.0465	pure
CY2023Q4	fnwb	Time Deposits Brokered TimeDepositsBrokered	207626000	usd
CY2023Q4	fnwb	Weighted Average Rate Domestic Deposit Certificates Of Deposit Brokered WeightedAverageRateDomesticDepositCertificatesOfDepositBrokered	0.0485	pure
CY2024Q3	us-gaap	Deposits Deposits	1711641000	usd
CY2024Q3	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0268	pure
CY2023Q4	us-gaap	Deposits Deposits	1676892000	usd
CY2023Q4	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0234	pure
CY2024Q3	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	170700000	usd
CY2023Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	173800000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Next Rolling Twelve Months TimeDepositMaturitiesNextRollingTwelveMonths	523584000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Next Rolling Twelve Months TimeDepositMaturitiesNextRollingTwelveMonths	495605000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Rolling Year Two TimeDepositMaturitiesRollingYearTwo	45754000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Two TimeDepositMaturitiesRollingYearTwo	79537000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Rolling Year Three TimeDepositMaturitiesRollingYearThree	31221000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Three TimeDepositMaturitiesRollingYearThree	24777000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Rolling Year Four TimeDepositMaturitiesRollingYearFour	24305000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Four TimeDepositMaturitiesRollingYearFour	28302000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Rolling Year Five TimeDepositMaturitiesRollingYearFive	20506000	usd
CY2023Q4	us-gaap	Time Deposit Maturities Rolling Year Five TimeDepositMaturitiesRollingYearFive	22817000	usd
CY2024Q3	us-gaap	Time Deposits TimeDeposits	645370000	usd
CY2023Q4	us-gaap	Time Deposits TimeDeposits	651038000	usd
CY2024Q3	fnwb	Deposits Public Fund DepositsPublicFund	119000000	usd
CY2023Q4	fnwb	Deposits Public Fund DepositsPublicFund	114200000	usd
CY2024Q3	fnwb	Deposits Funds Held By Federally Recognized Tribes DepositsFundsHeldByFederallyRecognizedTribes	20700000	usd
CY2023Q4	fnwb	Deposits Funds Held By Federally Recognized Tribes DepositsFundsHeldByFederallyRecognizedTribes	18400000	usd
CY2024Q3	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	187000	usd
CY2023Q3	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	204000	usd
	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	567000	usd
	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	599000	usd
CY2024Q3	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	2875000	usd
CY2023Q3	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	1146000	usd
	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	7244000	usd
	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	2866000	usd
CY2024Q3	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	923000	usd
CY2023Q3	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	918000	usd
	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	2791000	usd
	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	2056000	usd
CY2024Q3	fnwb	Interest Expense Time Deposits Retail InterestExpenseTimeDepositsRetail	4340000	usd
CY2023Q3	fnwb	Interest Expense Time Deposits Retail InterestExpenseTimeDepositsRetail	3505000	usd
	fnwb	Interest Expense Time Deposits Retail InterestExpenseTimeDepositsRetail	12913000	usd
	fnwb	Interest Expense Time Deposits Retail InterestExpenseTimeDepositsRetail	8323000	usd
CY2024Q3	fnwb	Interest Expense Time Deposits Brokered InterestExpenseTimeDepositsBrokered	2635000	usd
CY2023Q3	fnwb	Interest Expense Time Deposits Brokered InterestExpenseTimeDepositsBrokered	1926000	usd
	fnwb	Interest Expense Time Deposits Brokered InterestExpenseTimeDepositsBrokered	7737000	usd
	fnwb	Interest Expense Time Deposits Brokered InterestExpenseTimeDepositsBrokered	4417000	usd
CY2024Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	10960000	usd
CY2023Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	7699000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	31252000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	18261000	usd
CY2024Q3	fnwb	Federal Home Loan Bank Advances Maximum Available Credit To Bank Assets Percentage FederalHomeLoanBankAdvancesMaximumAvailableCreditToBankAssetsPercentage	0.35	pure
CY2024Q3	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	226100000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Amount Of Available Unused Funds FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds	253800000	usd
CY2024Q3	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	907300000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	896200000	usd
CY2024Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	60000000	usd
CY2024Q3	us-gaap	Line Of Credit Facility Fair Value Of Amount Outstanding LineOfCreditFacilityFairValueOfAmountOutstanding	5500000	usd
	us-gaap	Line Of Credit Facility Maximum Monthend Outstanding Amount LineOfCreditFacilityMaximumMonthendOutstandingAmount	10000000	usd
	fnwb	Line Of Credit Facility Average Monthly Amount LineOfCreditFacilityAverageMonthlyAmount	6856000	usd
	us-gaap	Line Of Credit Facility Interest Rate During Period LineOfCreditFacilityInterestRateDuringPeriod	0.096	pure
CY2024Q3	us-gaap	Line Of Credit Facility Interest Rate At Period End LineOfCreditFacilityInterestRateAtPeriodEnd	0.085	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.255	pure
	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.199	pure
	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	-1980000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	2504000	usd
	us-gaap	Net Income Loss NetIncomeLoss	-3803000	usd
	us-gaap	Net Income Loss NetIncomeLoss	7808000	usd
CY2024Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	1000	usd
CY2023Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	11000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	3000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	39000	usd
CY2024Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-1981000	usd
CY2023Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	2493000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-3806000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	7769000	usd
CY2024Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	9419143
CY2023Q3	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	9631929
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	9469960
	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	9666900
CY2024Q3	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	115322
CY2023Q3	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	125338
	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	104622
	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	143326
CY2024Q3	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	547056
CY2023Q3	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	600065
	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	560214
	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	613183
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8756765
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8906526
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8805124
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8910391
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8756765
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8906526
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8805124
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	8910391
CY2024Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
CY2023Q3	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	28356
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	0
	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	20013
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	8756765
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	8934882
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	8805124
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	8930404
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.23
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.28
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.43
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.87
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.23
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.43
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.87
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	20663
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	13582
CY2024Q3	fnwb	Employee Stock Ownership Plan Esop Requisite Service Period EmployeeStockOwnershipPlanEsopRequisiteServicePeriod	P12M
CY2024Q3	fnwb	Employee Stock Ownership Plan Esop Debt Structure Amortization Period EmployeeStockOwnershipPlanEsopDebtStructureAmortizationPeriod	P20Y
CY2024Q3	fnwb	Employee Stock Ownership Plan Esop Debt Structure Estimated Interest Rate EmployeeStockOwnershipPlanEsopDebtStructureEstimatedInterestRate	0.0246	pure
	fnwb	Employee Stock Ownership Plan Esop Principal And Interest Payments From Esop EmployeeStockOwnershipPlanEsopPrincipalAndInterestPaymentsFromEsop	837000	usd
	fnwb	Employee Stock Ownership Plan Esop Principal And Interest Payments From Esop EmployeeStockOwnershipPlanEsopPrincipalAndInterestPaymentsFromEsop	835000	usd
CY2024Q3	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	136000	usd
CY2023Q3	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	167000	usd
	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	481000	usd
	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	507000	usd
CY2024Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	492208
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	439174
CY2024Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	13221
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	26514
CY2024Q3	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	542600
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	582341
CY2024Q3	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2024Q3	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	5806000	usd
CY2023Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	9283000	usd
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Number ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	10220
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	81181
	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod	32449
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod	1288
CY2024Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeitures Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue	20.19
CY2024Q2	us-gaap	Property Plant And Equipment Gross Period Increase Decrease PropertyPlantAndEquipmentGrossPeriodIncreaseDecrease	-6800000	usd

Files In Submission

Name	View Source	Status
0001437749-24-034591-index-headers.html	Edgar Link	pending
0001437749-24-034591-index.html	Edgar Link	pending
0001437749-24-034591.txt	Edgar Link	pending
0001437749-24-034591-xbrl.zip	Edgar Link	pending
ex_718500.htm	Edgar Link	pending
ex_718501.htm	Edgar Link	pending
ex_718502.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
fnwb-20240930.xsd	Edgar Link	pending
fnwb20240930c_10q.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
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R2.htm	Edgar Link	pending
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R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
fnwb-20240930_cal.xml	Edgar Link	unprocessable
fnwb-20240930_def.xml	Edgar Link	unprocessable
fnwb-20240930_lab.xml	Edgar Link	unprocessable
fnwb-20240930_pre.xml	Edgar Link	unprocessable
fnwb20240930c_10q_htm.xml	Edgar Link	completed
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
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R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$FNWB
First Northwest Bancorp Stock $fnwb

2024 Q4 Form 10-Q Financial Statement

#000143774924034591 Filed on November 12, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNWB First Northwest Bancorp Stock $fnwb

2024 Q4 Form 10-Q Financial Statement

#000143774924034591 Filed on November 12, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNWB
First Northwest Bancorp Stock $fnwb