$FNWB
First Northwest Bancorp Stock $fnwb

$fnwb Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-K Financial Statement

#000143774922006713 Filed on March 18, 2022

Income Statement

Concept	2021 Q4	2021	2020 Q4
Revenue		$63.67M
YoY Change		23.2%
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	$410.0K	$1.430M	$350.0K
YoY Change	17.14%	3.62%	-14.63%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$5.373M
YoY Change		-30.44%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$6.060M	$18.17M	$4.670M
YoY Change	29.76%	36.7%	72.32%
Income Tax	$1.110M	$3.194M	$850.0K
% Of Pretax Income	18.32%	17.58%	18.2%
Net Earnings	$5.120M	$15.42M	$3.820M
YoY Change	34.03%	49.11%	72.07%
Net Earnings / Revenue		24.22%
Basic Earnings Per Share		$1.63
Diluted Earnings Per Share	$567.0K	$1.63	$411.2K
COMMON SHARES
Basic Shares Outstanding	10.03M	9.134M	10.23M
Diluted Shares Outstanding		9.229M

Balance Sheet

Concept	2021 Q4	2021	2020 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$126.0M		$65.16M
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	$19.83M	$27.40M	$14.79M
YoY Change	34.12%	46.52%	3.09%
Goodwill
YoY Change
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$1.921B	$1.921B	$1.654B
YoY Change	16.12%	16.13%	26.54%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$400.0K	$400.0K	$100.0K
YoY Change	300.0%	300.0%	-75.0%
Accrued Expenses	$29.20M	$29.20M	$23.30M
YoY Change	25.32%	25.32%	61.81%
Deferred Revenue
YoY Change
Short-Term Debt
YoY Change
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$29.60M	$29.60M	$23.40M
YoY Change	26.5%	26.5%	58.11%
LONG-TERM LIABILITIES
Long-Term Debt	$39.30M	$39.30M	$0.00
YoY Change
Other Long-Term Liabilities	$1.100M	$1.100M	$1.100M
YoY Change	0.0%	0.0%	0.0%
Total Long-Term Liabilities	$40.40M	$40.40M	$1.100M
YoY Change	3572.73%	3572.73%	0.0%
TOTAL LIABILITIES
Total Short-Term Liabilities	$29.60M	$29.60M	$23.40M
Total Long-Term Liabilities	$40.40M	$40.40M	$1.100M
Total Liabilities	$1.731B	$1.730B	$1.468B
YoY Change	17.89%	17.85%	29.85%
SHAREHOLDERS EQUITY
Retained Earnings	$103.0M		$92.66M
YoY Change	11.18%		7.55%
Common Stock	$100.0K		$102.0K
YoY Change	-1.96%		-4.67%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$191.0M	$191.0M	$186.4M
YoY Change
Total Liabilities & Shareholders Equity	$1.921B	$1.921B	$1.654B
YoY Change	16.12%	16.13%	26.54%

Cashflow Statement

Concept	2021 Q4	2021	2020 Q4
OPERATING ACTIVITIES
Net Income	$5.120M	$15.42M	$3.820M
YoY Change	34.03%	49.11%	72.07%
Depreciation, Depletion And Amortization	$410.0K	$1.430M	$350.0K
YoY Change	17.14%	3.62%	-14.63%
Cash From Operating Activities	$3.700M	$15.16M	$9.940M
YoY Change	-62.78%	14.33%	256.27%
INVESTING ACTIVITIES
Capital Expenditures	-$2.040M	$6.019M	-$390.0K
YoY Change	423.08%	231.08%	62.5%
Acquisitions
YoY Change
Other Investing Activities	-$26.55M	-$130.9M	-$74.57M
YoY Change	-64.4%	-58.35%	13.33%
Cash From Investing Activities	-$28.59M	-$136.9M	-$74.96M
YoY Change	-61.86%	-56.68%	13.49%
FINANCING ACTIVITIES
Cash Dividend Paid		$2.533M
YoY Change		15.93%
Common Stock Issuance & Retirement, Net		$5.979M
YoY Change		-19.34%
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	74.79M	$182.6M	78.10M
YoY Change	-4.24%	-42.79%	40.67%
NET CHANGE
Cash From Operating Activities	3.700M	$15.16M	9.940M
Cash From Investing Activities	-28.59M	-$136.9M	-74.96M
Cash From Financing Activities	74.79M	$182.6M	78.10M
Net Change In Cash	49.90M	$60.86M	13.08M
YoY Change	281.5%	270.74%	-268.99%
FREE CASH FLOW
Cash From Operating Activities	$3.700M	$15.16M	$9.940M
Capital Expenditures	-$2.040M	$6.019M	-$390.0K
Free Cash Flow	$5.740M	$9.136M	$10.33M
YoY Change	-44.43%	-20.13%	240.92%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2021	dei	Auditor Location AuditorLocation	Everett, Washington
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	15124000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	13847000	USD
CY2021Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2020Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		USD
CY2021Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2020Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2021Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2021Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2020Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2020Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2021Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2021Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	75000000
CY2021Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	9972698
CY2021Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	9972698
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	10247185
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	10247185
CY2020	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.21
CY2021	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.25
CY2020Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2020	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Amount Repurchased TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseAmountRepurchased	0	USD
CY2020	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2020	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	USD
CY2021	fnwb	Multiemployer Plans Requisite Service Period MultiemployerPlansRequisiteServicePeriod	P1Y
CY2021	fnwb	Multiemployer Plans Benefit Vesting Period MultiemployerPlansBenefitVestingPeriod	P5Y
CY2021	fnwb	Employee Stock Ownership Plan Esop Minimum Service Period Hours EmployeeStockOwnershipPlanEsopMinimumServicePeriodHours	1000	pure
CY2020	fnwb	Employee Stock Ownership Plan Esop Principal And Interest Payments From Esop EmployeeStockOwnershipPlanEsopPrincipalAndInterestPaymentsFromEsop	835000	USD
CY2020Q4	fnwb	Fair Value Measurement With Unobservable Inputs Reconciliation Discount FairValueMeasurementWithUnobservableInputsReconciliationDiscount	0	USD
CY2021Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	13868000	USD
CY2020Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	13508000	USD
CY2021Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	112148000	USD
CY2020Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	51647000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	344212000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	364296000	USD
CY2021Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	760000	USD
CY2020Q4	us-gaap	Loans Receivable Held For Sale Amount LoansReceivableHeldForSaleAmount	3753000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1350260000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1141969000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	5196000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	5977000	USD
CY2021Q4	us-gaap	Interest Receivable InterestReceivable	5289000	USD
CY2020Q4	us-gaap	Interest Receivable InterestReceivable	6966000	USD
CY2020Q4	us-gaap	Servicing Asset ServicingAsset	2120000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	19830000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	14785000	USD
CY2021Q4	us-gaap	Servicing Asset ServicingAsset	3282000	USD
CY2021Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	39318000	USD
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	39280000	USD
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	0	USD
CY2021Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	393000	USD
CY2020Q4	us-gaap	Interest Payable Current And Noncurrent InterestPayableCurrentAndNoncurrent	53000	USD
CY2021Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	29240000	USD
CY2020Q4	us-gaap	Accrued Liabilities And Other Liabilities AccruedLiabilitiesAndOtherLiabilities	23303000	USD
CY2021Q4	us-gaap	Advance Payments By Borrowers For Taxes And Insurance AdvancePaymentsByBorrowersForTaxesAndInsurance	1108000	USD
CY2020Q4	us-gaap	Advance Payments By Borrowers For Taxes And Insurance AdvancePaymentsByBorrowersForTaxesAndInsurance	1116000	USD
CY2021Q4	us-gaap	Liabilities Liabilities	1730601000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	1467966000	USD
CY2021Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2020Q4	us-gaap	Preferred Stock Value PreferredStockValue	0	USD
CY2021Q4	us-gaap	Common Stock Value CommonStockValue	100000	USD
CY2020Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	38353000	USD
CY2021Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	1183000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	0	USD
CY2021Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	25735000	USD
CY2020Q4	us-gaap	Prepaid Expense And Other Assets PrepaidExpenseAndOtherAssets	10975000	USD
CY2021Q4	us-gaap	Assets Assets	1921081000	USD
CY2020Q4	us-gaap	Assets Assets	1654349000	USD
CY2021Q4	us-gaap	Deposits Deposits	1580580000	USD
CY2020Q4	us-gaap	Deposits Deposits	1333517000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	80000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Long Term FederalHomeLoanBankAdvancesLongTerm	109977000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	102000	USD
CY2021Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	96131000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	97412000	USD
CY2021Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	103014000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	92657000	USD
CY2021Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	288000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	5442000	USD
CY2021Q4	fnwb	Unearned Esop Shares Cost UnearnedESOPSharesCost	8572000	USD
CY2020Q4	fnwb	Unearned Esop Shares Cost UnearnedESOPSharesCost	9230000	USD
CY2021Q4	us-gaap	Stockholders Equity StockholdersEquity	190961000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	186383000	USD
CY2021Q4	us-gaap	Minority Interest MinorityInterest	-481000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	0	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	190480000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	186383000	USD
CY2021Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1921081000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1654349000	USD
CY2021	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	55029000	USD
CY2020	us-gaap	Interest And Fee Income Loans And Leases InterestAndFeeIncomeLoansAndLeases	43063000	USD
CY2021	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	2550000	USD
CY2020	us-gaap	Interest Income Securities Mortgage Backed InterestIncomeSecuritiesMortgageBacked	2701000	USD
CY2021	us-gaap	Interest Income Debt Securities Operating InterestIncomeDebtSecuritiesOperating	5819000	USD
CY2020	us-gaap	Interest Income Debt Securities Operating InterestIncomeDebtSecuritiesOperating	5569000	USD
CY2021	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	83000	USD
CY2020	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	94000	USD
CY2021	fnwb	Dividend Income Operating Federal Home Loan Bank DividendIncomeOperatingFederalHomeLoanBank	190000	USD
CY2020	fnwb	Dividend Income Operating Federal Home Loan Bank DividendIncomeOperatingFederalHomeLoanBank	255000	USD
CY2021	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	63671000	USD
CY2020	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	51682000	USD
CY2020	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	38912000	USD
CY2021	us-gaap	Interest Expense Deposits InterestExpenseDeposits	3396000	USD
CY2020	us-gaap	Interest Expense Deposits InterestExpenseDeposits	6663000	USD
CY2021	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	774000	USD
CY2020	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	1061000	USD
CY2021	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	1203000	USD
CY2020	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	0	USD
CY2021	us-gaap	Interest Expense InterestExpense	5373000	USD
CY2020	us-gaap	Interest Expense InterestExpense	7724000	USD
CY2021	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	58298000	USD
CY2020	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	43958000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1350000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5046000	USD
CY2021	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	56948000	USD
CY2021	us-gaap	Revenue Not From Contract With Customer Excluding Interest Income RevenueNotFromContractWithCustomerExcludingInterestIncome	3860000	USD
CY2020	us-gaap	Revenue Not From Contract With Customer Excluding Interest Income RevenueNotFromContractWithCustomerExcludingInterestIncome	3454000	USD
CY2021	fnwb	Fees And Commissions Mortgage Banking And Servicing Net Of Amortization FeesAndCommissionsMortgageBankingAndServicingNetOfAmortization	946000	USD
CY2020	fnwb	Fees And Commissions Mortgage Banking And Servicing Net Of Amortization FeesAndCommissionsMortgageBankingAndServicingNetOfAmortization	137000	USD
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5278000	USD
CY2020	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6433000	USD
CY2021	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	2410000	USD
CY2020	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	3147000	USD
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	965000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1826000	USD
CY2021	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2179000	USD
CY2020	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	849000	USD
CY2021	us-gaap	Noninterest Income NoninterestIncome	15638000	USD
CY2020	us-gaap	Noninterest Income NoninterestIncome	15846000	USD
CY2021	us-gaap	Labor And Related Expense LaborAndRelatedExpense	33515000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	24590000	USD
CY2021	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6244000	USD
CY2020	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	4637000	USD
CY2021	us-gaap	Occupancy Net OccupancyNet	4312000	USD
CY2020	us-gaap	Occupancy Net OccupancyNet	3879000	USD
CY2021	fnwb	Supplies Postage And Telephone Expense SuppliesPostageAndTelephoneExpense	1189000	USD
CY2020	fnwb	Supplies Postage And Telephone Expense SuppliesPostageAndTelephoneExpense	985000	USD
CY2021	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	1213000	USD
CY2020	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	930000	USD
CY2021	us-gaap	Advertising Expense AdvertisingExpense	2040000	USD
CY2020	us-gaap	Advertising Expense AdvertisingExpense	1506000	USD
CY2021	us-gaap	Professional Fees ProfessionalFees	1997000	USD
CY2020	us-gaap	Professional Fees ProfessionalFees	1523000	USD
CY2021	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	752000	USD
CY2020	fnwb	Federal Deposit Insurance Corporation Premium Return FederalDepositInsuranceCorporationPremiumReturn	245000	USD
CY2021	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Repayment And Penalties FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties	0	USD
CY2020	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Repayment And Penalties FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresRepaymentAndPenalties	210000	USD
CY2021	us-gaap	Other Noninterest Expense OtherNoninterestExpense	3151000	USD
CY2020	us-gaap	Other Noninterest Expense OtherNoninterestExpense	2959000	USD
CY2021	us-gaap	Noninterest Expense NoninterestExpense	54413000	USD
CY2020	us-gaap	Noninterest Expense NoninterestExpense	41464000	USD
CY2021	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	18173000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	13294000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3194000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2954000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	14979000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	10340000	USD
CY2021	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-439000	USD
CY2020	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	-0	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	15418000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	10340000	USD
CY2021	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.63
CY2020	us-gaap	Earnings Per Share Basic And Diluted EarningsPerShareBasicAndDiluted	1.07
CY2021	us-gaap	Profit Loss ProfitLoss	14979000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	10340000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-1771000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	11984000	USD
CY2021	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-373000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	2517000	USD
CY2021	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	2344000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plan Net Prior Service Cost Credit Arising During Period Before Tax OtherComprehensiveIncomeDefinedBenefitPlanNetPriorServiceCostCreditArisingDuringPeriodBeforeTax	-0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	492000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Benefit Plan Improvement Tax Effect OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansBenefitPlanImprovementTaxEffect	0	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	2410000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	3147000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	506000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	661000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5154000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6981000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	9825000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	17321000	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	-439000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	0	USD
CY2021	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	10264000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	17321000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	176851000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	10340000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	7413000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	178000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	6981000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1295000	USD
CY2020	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	692000	USD
CY2020	us-gaap	Dividends Cash DividendsCash	2185000	USD
CY2021	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5154000	USD
CY2021	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1794000	USD
CY2021	us-gaap	Amortization Of Esop Award AmortizationOfESOPAward	929000	USD
CY2021	us-gaap	Dividends Cash DividendsCash	2533000	USD
CY2021Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	190480000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	14979000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	186383000	USD
CY2021	us-gaap	Profit Loss ProfitLoss	14979000	USD
CY2021Q4	fnwb	Stock Issued During Period Value Investment StockIssuedDuringPeriodValueInvestment	413000	USD
CY2021	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	5979000	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	USD
CY2021	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	352000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	10340000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1432000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1375000	USD
CY2021	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	0	USD
CY2021	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1753000	USD
CY2020	us-gaap	Accretion Amortization Of Discounts And Premiums Investments AccretionAmortizationOfDiscountsAndPremiumsInvestments	-1551000	USD
CY2021	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	-1260000	USD
CY2020	us-gaap	Amortization Of Deferred Loan Origination Fees Net AmortizationOfDeferredLoanOriginationFeesNet	1113000	USD
CY2021	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	57000	USD
CY2020	us-gaap	Amortization Of Financing Costs AmortizationOfFinancingCosts	0	USD
CY2021	fnwb	Amortization Of Mortgage Servicing Rights Net AmortizationOfMortgageServicingRightsNet	108000	USD
CY2020	fnwb	Amortization Of Mortgage Servicing Rights Net AmortizationOfMortgageServicingRightsNet	278000	USD
CY2021	fnwb	Servicing Asset At Fair Value Additions Net ServicingAssetAtFairValueAdditionsNet	-1233000	USD
CY2020	fnwb	Servicing Asset At Fair Value Additions Net ServicingAssetAtFairValueAdditionsNet	-1564000	USD
CY2021	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	-37000	USD
CY2020	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	37000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1350000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5046000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	63000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1131000	USD
CY2021	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	675000	USD
CY2020	us-gaap	Employee Stock Ownership Plan Esop Compensation Expense EmployeeStockOwnershipPlanESOPCompensationExpense	475000	USD
CY2021	us-gaap	Share Based Compensation ShareBasedCompensation	2294000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	1295000	USD
CY2021	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5278000	USD
CY2020	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6433000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	2410000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain Loss DebtSecuritiesAvailableForSaleRealizedGainLoss	3147000	USD
CY2021	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	965000	USD
CY2020	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	1826000	USD
CY2021	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	137715000	USD
CY2020	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	187959000	USD
CY2021	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	145986000	USD
CY2020	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	191142000	USD
CY2021	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	-1677000	USD
CY2020	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	3035000	USD
CY2021	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	15404000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-781000	USD
CY2021	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	340000	USD
CY2020	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-319000	USD
CY2021	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	6218000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	7463000	USD
CY2021	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	15155000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	13256000	USD
CY2021	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	152930000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	305713000	USD
CY2021	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	59663000	USD
CY2020	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	57166000	USD
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	109829000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	210264000	USD
CY2021	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-781000	USD
CY2020	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-57000	USD
CY2021	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	-0	USD
CY2020	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	6500000	USD
CY2021	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	210901000	USD
CY2020	us-gaap	Payments For Proceeds From Loans And Leases PaymentsForProceedsFromLoansAndLeases	267994000	USD
CY2021	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	6019000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1818000	USD
CY2021	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	584000	USD
CY2020	us-gaap	Payments To Acquire Equity Method Investments PaymentsToAcquireEquityMethodInvestments	1416000	USD
CY2021	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	248000	USD
CY2020	us-gaap	Payments To Acquire Partners Interest In Real Estate Partnership Net Of Cash Acquired PaymentsToAcquirePartnersInterestInRealEstatePartnershipNetOfCashAcquired	-0	USD
CY2021	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	63545000	USD
CY2020	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2021	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-136864000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-315954000	USD
CY2021	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	182196000	USD
CY2020	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	331872000	USD
CY2021	fnwb	Proceeds From Fhl Bank Advance Financing Activities ProceedsFromFHLBankAdvanceFinancingActivities	40000000	USD
CY2020	fnwb	Proceeds From Fhl Bank Advance Financing Activities ProceedsFromFHLBankAdvanceFinancingActivities	30000000	USD
CY2021	fnwb	Payments Of Fhlbank Borrowings Financing Activities Longterm PaymentsOfFhlbankBorrowingsFinancingActivitiesLongterm	10000000	USD
CY2020	fnwb	Payments Of Fhlbank Borrowings Financing Activities Longterm PaymentsOfFhlbankBorrowingsFinancingActivitiesLongterm	30000000	USD
CY2021	fnwb	Payments Of Fhlbank Borrowings Financing Activities Shortterm PaymentsOfFhlbankBorrowingsFinancingActivitiesShortterm	59977000	USD
CY2020	fnwb	Payments Of Fhlbank Borrowings Financing Activities Shortterm PaymentsOfFhlbankBorrowingsFinancingActivitiesShortterm	2953000	USD
CY2021	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	39223000	USD
CY2020	us-gaap	Proceeds From Issuance Of Subordinated Long Term Debt ProceedsFromIssuanceOfSubordinatedLongTermDebt	0	USD
CY2021	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-8000	USD
CY2020	us-gaap	Increase Decrease In Advance Payments By Borrowers For Taxes And Insurance IncreaseDecreaseInAdvancePaymentsByBorrowersForTaxesAndInsurance	-29000	USD
CY2021	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	352000	USD
CY2020	us-gaap	Payments For Repurchase Of Other Equity PaymentsForRepurchaseOfOtherEquity	178000	USD
CY2021	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	5979000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	7413000	USD
CY2021	us-gaap	Payments Of Dividends PaymentsOfDividends	2533000	USD
CY2020	us-gaap	Payments Of Dividends PaymentsOfDividends	2185000	USD
CY2021	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	182570000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	319114000	USD
CY2021	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	60861000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	16416000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	65155000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	48739000	USD
CY2021Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	126016000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	65155000	USD
CY2021	us-gaap	Interest Paid Net InterestPaidNet	4550000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	8043000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1047000	USD
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	1340000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	0	USD
CY2021Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	65947000	USD
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities	0	USD
CY2015Q1	us-gaap	Stock Issued During Period Shares New Issues StockIssuedDuringPeriodSharesNewIssues	13100360
CY2021	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	4270000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2900000	USD
CY2021	fnwb	Cash Payment Of Prior Unrecognized Service Cost CashPaymentOfPriorUnrecognizedServiceCost	2718000	USD
CY2020	fnwb	Cash Payment Of Prior Unrecognized Service Cost CashPaymentOfPriorUnrecognizedServiceCost	0	USD
CY2021	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	-4181000	USD
CY2020	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	8837000	USD
CY2021	fnwb	Loans Transferred To Real Estate Owned And Repossessed Assets Net Of Deferred Loan Fees And Allowance For Loan Losses LoansTransferredToRealEstateOwnedAndRepossessedAssetsNetOfDeferredLoanFeesAndAllowanceForLoanLosses	0	USD
CY2020	fnwb	Loans Transferred To Real Estate Owned And Repossessed Assets Net Of Deferred Loan Fees And Allowance For Loan Losses LoansTransferredToRealEstateOwnedAndRepossessedAssetsNetOfDeferredLoanFeesAndAllowanceForLoanLosses	529000	USD
CY2021	fnwb	Investment In Lowincome Housing Tax Credit Partnership InvestmentInLowincomeHousingTaxCreditPartnership	4949000	USD
CY2020	fnwb	Investment In Lowincome Housing Tax Credit Partnership InvestmentInLowincomeHousingTaxCreditPartnership	0	USD
CY2021	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4402000	USD
CY2015Q1	fnwb	Proceeds From Issuance Of Common Stock Net ProceedsFromIssuanceOfCommonStockNet	117600000	USD
CY2015Q1	us-gaap	Proceeds From Issuance Initial Public Offering ProceedsFromIssuanceInitialPublicOffering	58400000	USD
CY2014Q2	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	79700000	USD
CY2015Q4	fnwb	Employee Stock Ownership Plan Esop EmployeeStockOwnershipPlanESOP	0.08	pure
CY2015Q4	us-gaap	Stock Issued During Period Shares Employee Stock Ownership Plan StockIssuedDuringPeriodSharesEmployeeStockOwnershipPlan	1048029
CY2015Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2015Q4	fnwb	Employee Stock Ownership Plan Esop Number Of Shares Purchased Percentage EmployeeStockOwnershipPlanEsopNumberOfSharesPurchasedPercentage	1.000	pure
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	333396
CY2021	us-gaap	Use Of Estimates UseOfEstimates	<p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"><b>Use of estimates </b>- The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make assumptions. These assumptions result in estimates that affect the reported amounts of assets and liabilities, revenues and expenses, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to a determination of the allowance for loan losses, fair value of financial instruments, deferred tax assets and liabilities, and the valuation of impaired loans.</p> <p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"> </p>
CY2021Q4	us-gaap	Trading Securities TradingSecurities	0	USD
CY2021Q4	fnwb	Federal Home Loan Bank Minimum Investment Requirement FederalHomeLoanBankMinimumInvestmentRequirement	5200000	USD
CY2020Q4	fnwb	Federal Home Loan Bank Minimum Investment Requirement FederalHomeLoanBankMinimumInvestmentRequirement	5900000	USD
CY2021Q4	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Remaining Balance TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseRemainingBalance	2000000.0	USD
CY2020Q4	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Remaining Balance TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseRemainingBalance	2700000	USD
CY2021	fnwb	Transfers Of Financial Assets Mortgage Loans Sold With Recourse Amount Repurchased TransfersOfFinancialAssetsMortgageLoansSoldWithRecourseAmountRepurchased	0	USD
CY2021	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<p style="font-family: "Times New Roman"; font-size: 10pt; margin: 0pt; text-align: left;"><b style="font-size: 10pt;">Reclassifications</b><b style="font-size: 10pt;"> </b>- Certain amounts in prior periods have been reclassified to conform to the current audited financial statement presentation with <em style="font: inherit;">no</em> effect on net income or shareholders' equity.</p> <p> </p>
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	341504000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	5252000	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	2544000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	344212000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	357407000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	8358000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	1469000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	364296000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	99400000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	1820000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	126789000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	724000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	29603000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	2544000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	156392000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	118000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	39688000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	1351000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	59749000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1469000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	99437000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	76	pure
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	2500000	USD
CY2021Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	156400000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	36	pure
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	1500000	USD
CY2021	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2021Q4	us-gaap	Available For Sale Debt Securities Amortized Cost Basis AvailableForSaleDebtSecuritiesAmortizedCostBasis	341504000	USD
CY2021Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	344212000	USD
CY2020Q4	us-gaap	Held To Maturity Securities HeldToMaturitySecurities	357407000	USD
CY2020Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	364296000	USD
CY2021	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	109829000	USD
CY2020	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	210264000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	2827000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	4537000	USD
CY2021	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-417000	USD
CY2020	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-1390000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	1357161000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	1154033000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	4772000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Deferred Income LoansAndLeasesReceivableDeferredIncome	4346000	USD
CY2021Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	12995000	USD
CY2020Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	6129000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	15124000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	13847000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1350260000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Net Reported Amount LoansAndLeasesReceivableNetReportedAmount	1141969000	USD
CY2021Q4	fnwb	Loans Receivable Earlier Of Contractual Maturity Or Next Repricing Date LoansReceivableEarlierOfContractualMaturityOrNextRepricingDate	1357161000	USD
CY2020Q4	fnwb	Loans Receivable Earlier Of Contractual Maturity Or Next Repricing Date LoansReceivableEarlierOfContractualMaturityOrNextRepricingDate	1154033000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	13847000	USD
CY2021	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	1350000	USD
CY2021	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	877000	USD
CY2021	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	804000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	15124000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	15124000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	15011000	USD
CY2021Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	113000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1357161000	USD
CY2021Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1353966000	USD
CY2021Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	3195000	USD
CY2019Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	9628000	USD
CY2020	us-gaap	Provision For Loan And Lease Losses ProvisionForLoanAndLeaseLosses	5046000	USD
CY2020	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	997000	USD
CY2020	us-gaap	Allowance For Loan And Lease Loss Recovery Of Bad Debts AllowanceForLoanAndLeaseLossRecoveryOfBadDebts	170000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	13847000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Allowance LoansAndLeasesReceivableAllowance	13847000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Collectively Evaluated For Impairment FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment	13530000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Losses Individually Evaluated For Impairment1 FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1	317000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1154033000	USD
CY2020Q4	us-gaap	Financing Receivable Collectively Evaluated For Impairment FinancingReceivableCollectivelyEvaluatedForImpairment	1148522000	USD
CY2020Q4	fnwb	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	108000	USD
CY2020Q4	us-gaap	Financing Receivable Individually Evaluated For Impairment FinancingReceivableIndividuallyEvaluatedForImpairment	5511000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	2224000	USD
CY2021Q4	fnwb	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	29000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	309000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	584000	USD
CY2021	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	1390000	USD
CY2021	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	20000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	2886000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	3108000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	113000	USD
CY2021	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	3234000	USD
CY2021	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	161000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	3195000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	3692000	USD
CY2021Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	113000	USD
CY2021	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	4624000	USD
CY2021	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	181000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment	1764000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With No Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance	2196000	USD
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment	1718000	USD
CY2020	us-gaap	Impaired Financing Receivable With No Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod	60000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment	3747000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable With Related Allowance Unpaid Principal Balance ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance	4139000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	317000	USD
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Average Recorded Investment ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment	4660000	USD
CY2020	us-gaap	Impaired Financing Receivable With Related Allowance Interest Income Accrual Method ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod	225000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Recorded Investment ImpairedFinancingReceivableRecordedInvestment	5511000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Unpaid Principal Balance ImpairedFinancingReceivableUnpaidPrincipalBalance	6335000	USD
CY2020Q4	us-gaap	Impaired Financing Receivable Related Allowance ImpairedFinancingReceivableRelatedAllowance	317000	USD
CY2020	us-gaap	Impaired Financing Receivable Average Recorded Investment ImpairedFinancingReceivableAverageRecordedInvestment	6378000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Accrual Method ImpairedFinancingReceivableInterestIncomeAccrualMethod	285000	USD
CY2021	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	162000	USD
CY2020	us-gaap	Impaired Financing Receivable Interest Income Cash Basis Method ImpairedFinancingReceivableInterestIncomeCashBasisMethod	256000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	1381000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	2273000	USD
CY2021Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	1357161000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Before Fees Gross LoansAndLeasesReceivableBeforeFeesGross	1154033000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1357161000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1154033000	USD
CY2021Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1357161000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Gross Carrying Amount LoansAndLeasesReceivableGrossCarryingAmount	1154033000	USD
CY2020Q4	fnwb	Financing Receivable Number Of Temporary Loan Modifications FinancingReceivableNumberOfTemporaryLoanModifications	357	pure
CY2020Q4	fnwb	Financing Receivable Temporary Loan Modifications FinancingReceivableTemporaryLoanModifications	177600000	USD
CY2021Q4	fnwb	Financing Receivable Number Of Payment Deferrals FinancingReceivableNumberOfPaymentDeferrals	0	pure
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	1843000	USD
CY2021	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	0	pure
CY2020	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	pure
CY2021Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	USD
CY2021Q4	fnwb	Financing Receivable Troubled Debt Restructuring Accrual FinancingReceivableTroubledDebtRestructuringAccrual	1814000	USD
CY2021Q4	fnwb	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	29000	USD
CY2021Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	1843000	USD
CY2020Q4	fnwb	Financing Receivable Troubled Debt Restructuring Accrual FinancingReceivableTroubledDebtRestructuringAccrual	2116000	USD
CY2020Q4	fnwb	Financing Receivable Modifications Recorded Investment Nonaccrual FinancingReceivableModificationsRecordedInvestmentNonaccrual	108000	USD
CY2020Q4	us-gaap	Financing Receivable Modifications Recorded Investment FinancingReceivableModificationsRecordedInvestment	2224000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	35634000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	30353000	USD
CY2021Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	15804000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	15568000	USD
CY2021Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	19830000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	14785000	USD
CY2021	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1430000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	1380000	USD
CY2021	us-gaap	Lease Cost LeaseCost	868000	USD
CY2020	us-gaap	Lease Cost LeaseCost	587000	USD
CY2021	us-gaap	Operating Lease Payments OperatingLeasePayments	868000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	587000	USD
CY2021	fnwb	Rightofuse Asset Obtained In Exchange For New Operating Lease Liability RightofuseAssetObtainedInExchangeForNewOperatingLeaseLiability	4364000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1047000	USD
CY2021Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P10Y9M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P12Y6M
CY2021Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.024	pure
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.032	pure
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	831000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	852000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	886000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	925000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	903000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	4825000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	9222000	USD
CY2021Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1488000	USD
CY2021Q4	fnwb	Servicing Asset Mortgage Loans Serviced For Third Parties ServicingAssetMortgageLoansServicedForThirdParties	454400000	USD
CY2020Q4	fnwb	Servicing Asset Mortgage Loans Serviced For Third Parties ServicingAssetMortgageLoansServicedForThirdParties	268200000	USD
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	2120000	USD
CY2019Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	871000	USD
CY2021	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	1234000	USD
CY2020	us-gaap	Servicing Asset At Amortized Value Additions ServicingAssetAtAmortizedValueAdditions	1564000	USD
CY2021	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	109000	USD
CY2020	us-gaap	Servicing Asset At Amortized Value Amortization1 ServicingAssetAtAmortizedValueAmortization1	278000	USD
CY2021	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Period Increase Decrease ValuationAllowanceForImpairmentOfRecognizedServicingAssetsPeriodIncreaseDecrease	37000	USD
CY2020	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Period Increase Decrease ValuationAllowanceForImpairmentOfRecognizedServicingAssetsPeriodIncreaseDecrease	-37000	USD
CY2021Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	3282000	USD
CY2020Q4	us-gaap	Servicing Asset At Amortized Value ServicingAssetAtAmortizedValue	2120000	USD
CY2020Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	37000	USD
CY2019Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	-0	USD
CY2021	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions	-0	USD
CY2020	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Provisions ValuationAllowanceForImpairmentOfRecognizedServicingAssetsProvisions	37000	USD
CY2021	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsRecoveries	37000	USD
CY2020	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Recoveries ValuationAllowanceForImpairmentOfRecognizedServicingAssetsRecoveries	0	USD
CY2021Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	-0	USD
CY2020Q4	us-gaap	Valuation Allowance For Impairment Of Recognized Servicing Assets Balance ValuationAllowanceForImpairmentOfRecognizedServicingAssetsBalance	37000	USD
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.093	pure
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Prepayment Speed ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed	0.144	pure
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P5Y4M24D
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Weighted Average Life1 ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueWeightedAverageLife1	P4Y9M18D
CY2021	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.103	pure
CY2020	us-gaap	Servicing Assets And Servicing Liabilities At Fair Value Assumptions Used To Estimate Fair Value Discount Rate ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate	0.084	pure
CY2021Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	3800000	USD
CY2020Q4	us-gaap	Servicing Asset At Fair Value Amount ServicingAssetAtFairValueAmount	2200000	USD
CY2021	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	1013000	USD
CY2020	us-gaap	Contractually Specified Servicing Fees Amount ContractuallySpecifiedServicingFeesAmount	452000	USD
CY2021	us-gaap	Late Fee Income Generated By Servicing Financial Assets Amount LateFeeIncomeGeneratedByServicingFinancialAssetsAmount	9000	USD
CY2020	us-gaap	Late Fee Income Generated By Servicing Financial Assets Amount LateFeeIncomeGeneratedByServicingFinancialAssetsAmount	12000	USD
CY2021Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	75100000	USD
CY2020Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	91700000	USD
CY2021Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	343932000	USD
CY2020Q4	us-gaap	Noninterest Bearing Deposit Liabilities NoninterestBearingDepositLiabilities	274930000	USD
CY2021Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	196970000	USD
CY2021Q4	us-gaap	Weighted Average Rate Domestic Deposit Demand WeightedAverageRateDomesticDepositDemand	0.0001	pure
CY2020Q4	us-gaap	Interest Bearing Deposit Liabilities InterestBearingDepositLiabilities	156241000	USD
CY2020Q4	us-gaap	Weighted Average Rate Domestic Deposit Demand WeightedAverageRateDomesticDepositDemand	0.0001	pure
CY2021Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	597815000	USD
CY2021Q4	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0021	pure
CY2020Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	429143000	USD
CY2020Q4	us-gaap	Weighted Average Rate Domestic Deposit Money Market WeightedAverageRateDomesticDepositMoneyMarket	0.0031	pure
CY2021Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	194620000	USD
CY2021Q4	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0005	pure
CY2020Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	164434000	USD
CY2020Q4	us-gaap	Weighted Average Rate Domestic Deposit Savings WeightedAverageRateDomesticDepositSavings	0.0017	pure
CY2021Q4	us-gaap	Time Deposits TimeDeposits	247243000	USD
CY2021Q4	us-gaap	Weighted Average Rate Domestic Deposit Certificates Of Deposit WeightedAverageRateDomesticDepositCertificatesOfDeposit	0.0062	pure
CY2020Q4	us-gaap	Time Deposits TimeDeposits	308769000	USD
CY2020Q4	us-gaap	Weighted Average Rate Domestic Deposit Certificates Of Deposit WeightedAverageRateDomesticDepositCertificatesOfDeposit	0.0100	pure
CY2021Q4	us-gaap	Deposits Deposits	1580580000	USD
CY2021Q4	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0019	pure
CY2020Q4	us-gaap	Deposits Deposits	1333517000	USD
CY2020Q4	us-gaap	Weighted Average Rate Domestic Deposit WeightedAverageRateDomesticDeposit	0.0036	pure
CY2021Q4	us-gaap	Time Deposit Maturities Next Rolling Twelve Months TimeDepositMaturitiesNextRollingTwelveMonths	153472000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Rolling Year Two TimeDepositMaturitiesRollingYearTwo	54970000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Rolling Year Three TimeDepositMaturitiesRollingYearThree	17620000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Rolling Year Four TimeDepositMaturitiesRollingYearFour	14358000	USD
CY2021Q4	us-gaap	Time Deposit Maturities Rolling Year Five TimeDepositMaturitiesRollingYearFive	6823000	USD
CY2021Q4	us-gaap	Time Deposit Maturities After Rolling Year Five TimeDepositMaturitiesAfterRollingYearFive	0	USD
CY2021Q4	us-gaap	Time Deposits TimeDeposits	247243000	USD
CY2021Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	65700000	USD
CY2020Q4	us-gaap	Interest Bearing Domestic Deposit Brokered InterestBearingDomesticDepositBrokered	89600000	USD
CY2021Q4	fnwb	Deposits Public Fund DepositsPublicFund	134100000	USD
CY2020Q4	fnwb	Deposits Public Fund DepositsPublicFund	80900000	USD
CY2021Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	67900000	USD
CY2020Q4	us-gaap	Pledged Financial Instruments Not Separately Reported Securities Pledged PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged	48100000	USD
CY2021	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	43000	USD
CY2020	us-gaap	Interest Expense Demand Deposit Accounts InterestExpenseDemandDepositAccounts	37000	USD
CY2021	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	1165000	USD
CY2020	us-gaap	Interest Expense Money Market Deposits InterestExpenseMoneyMarketDeposits	1446000	USD
CY2021	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	128000	USD
CY2020	us-gaap	Interest Expense Savings Deposits InterestExpenseSavingsDeposits	843000	USD
CY2021	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	2060000	USD
CY2020	us-gaap	Interest Expense Time Deposits InterestExpenseTimeDeposits	4337000	USD
CY2021Q4	fnwb	Federal Home Loan Bank Advances Maximum Available Credit To Bank Assets Percentage FederalHomeLoanBankAdvancesMaximumAvailableCreditToBankAssetsPercentage	0.40	pure
CY2021Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	699500000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances General Debt Obligations Disclosures Collateral Pledged1 FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1	641700000	USD
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	80000000	USD
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	50000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRateUnderOneYear	0	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary By Interest Rate Type Floating Rate Under One Year FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFloatingRateUnderOneYear	59977000	USD
CY2021Q4	us-gaap	Subordinated Debt SubordinatedDebt	40000000	USD
CY2020Q4	us-gaap	Subordinated Debt SubordinatedDebt	0	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Of Amounts Due Within One Year Of Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOfAmountsDueWithinOneYearOfBalanceSheetDate	0	pure
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Next Rolling Twelve Months FederalHomeLoanBankAdvancesMaturitiesSummaryDueInNextRollingTwelveMonths	0	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0154	pure
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Two FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearTwo	15000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate One To Two Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateOneToTwoYearsFromBalanceSheetDate	0.0179	pure
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Two FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearTwo	10000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0147	pure
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Three FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearThree	15000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Two To Three Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateTwoToThreeYearsFromBalanceSheetDate	0.0154	pure
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Three FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearThree	15000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0142	pure
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Four FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFour	25000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Three To Four Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateThreeToFourYearsFromBalanceSheetDate	0.0147	pure
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Four FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFour	15000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Four To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate	0.0155	pure
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Five FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFive	15000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate Four To Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateFourToFiveYearsFromBalanceSheetDate	0.0136	pure
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due In Rolling Year Five FederalHomeLoanBankAdvancesMaturitiesSummaryDueInRollingYearFive	10000000	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate After Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate	0.0176	pure
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Rolling Year Five FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterRollingYearFive	10000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Average Interest Rate After Five Years From Balance Sheet Date FederalHomeLoanBankAdvancesMaturitiesSummaryAverageInterestRateAfterFiveYearsFromBalanceSheetDate	0	pure
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Maturities Summary Due After Rolling Year Five FederalHomeLoanBankAdvancesMaturitiesSummaryDueAfterRollingYearFive	0	USD
CY2021Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0152	pure
CY2021Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	80000000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Advances Weighted Average Interest Rate FederalHomeLoanBankAdvancesWeightedAverageInterestRate	0.0153	pure
CY2020Q4	us-gaap	Advances From Federal Home Loan Banks AdvancesFromFederalHomeLoanBanks	50000000	USD
CY2021	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	3131000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	4085000	USD
CY2021	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	63000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-1131000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3194000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2954000	USD
CY2021	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21	pure
CY2021	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	3909000	USD
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	2792000	USD
CY2021	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	218000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Exempt Income IncomeTaxReconciliationTaxExemptIncome	236000	USD
CY2021	fnwb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeAmount	203000	USD
CY2020	fnwb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Income Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceIncomeAmount	383000	USD
CY2021	fnwb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Surrender Penalty Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceSurrenderPenaltyAmount	0	USD
CY2020	fnwb	Effective Income Tax Rate Reconciliation Bank Owned Life Insurance Surrender Penalty Amount EffectiveIncomeTaxRateReconciliationBankOwnedLifeInsuranceSurrenderPenaltyAmount	748000	USD
CY2021	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-294000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	33000	USD
CY2021	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	3194000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2954000	USD
CY2021Q4	fnwb	Retaining Earnings Federal Income Taxes Not Provided RetainingEarningsFederalIncomeTaxesNotProvided	6400000	USD
CY2021Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0	USD
CY2021	us-gaap	Income Tax Examination Penalties And Interest Expense IncomeTaxExaminationPenaltiesAndInterestExpense	0	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	3255000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Provision For Loan Losses DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsProvisionForLoanLosses	2971000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	461000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	602000	USD
CY2021Q4	fnwb	Deferred Tax Assets Nonaccrual Loans DeferredTaxAssetsNonaccrualLoans	1000	USD
CY2020Q4	fnwb	Deferred Tax Assets Nonaccrual Loans DeferredTaxAssetsNonaccrualLoans	1000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	173000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	159000	USD
CY2021Q4	fnwb	Deferred Tax Assets Restricted Stock Awards DeferredTaxAssetsRestrictedStockAwards	312000	USD
CY2020Q4	fnwb	Deferred Tax Assets Restricted Stock Awards DeferredTaxAssetsRestrictedStockAwards	152000	USD
CY2021Q4	fnwb	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	1654000	USD
CY2020Q4	fnwb	Deferred Tax Assets Operating Lease Liability DeferredTaxAssetsOperatingLeaseLiability	868000	USD
CY2021Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	5856000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	4753000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	702000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Deferred Financing Costs DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts	605000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	569000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Unrealized Gains On Trading Securities DeferredTaxLiabilitiesUnrealizedGainsOnTradingSecurities	1447000	USD
CY2021Q4	fnwb	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	417000	USD
CY2020Q4	fnwb	Deferred Tax Liabilities Federal Home Loan Bank Stock Dividends DeferredTaxLiabilitiesFederalHomeLoanBankStockDividends	421000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	609000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	632000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	341000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Investments DeferredTaxLiabilitiesInvestments	58000	USD
CY2021Q4	fnwb	Deferred Tax Liabilities Defined Benefit Plan DeferredTaxLiabilitiesDefinedBenefitPlan	59000	USD
CY2020Q4	fnwb	Deferred Tax Liabilities Defined Benefit Plan DeferredTaxLiabilitiesDefinedBenefitPlan	0	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	1595000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	840000	USD
CY2021Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	3000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	4000	USD
CY2021Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4295000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	4007000	USD
CY2021Q4	fnwb	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	1561000	USD
CY2020Q4	fnwb	Deferred Tax Assets Liabilities Gross DeferredTaxAssetsLiabilitiesGross	746000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Two DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo	900000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Three DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree	1010000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Four DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour	870000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Year Five DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive	700000	USD
CY2020	fnwb	Multiemployer Plan Pension Funded Status Percentage MultiemployerPlanPensionFundedStatusPercentage	1.097	pure
CY2021	fnwb	Multiemployer Plans Percentage Of Employers Contributions MultiemployerPlansPercentageOfEmployersContributions	0.05	pure
CY2020	us-gaap	Multiemployer Plan Employer Contribution Cost MultiemployerPlanEmployerContributionCost	364000	USD
CY2021	fnwb	Defined Benefit Planf Prior Service Cost Credit Amortization Period DefinedBenefitPlanfPriorServiceCostCreditAmortizationPeriod	P15Y
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths	2390000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter	3980000	USD
CY2021	fnwb	Defined Benefit Plan Expected Future Benefit Payment Thereafter DefinedBenefitPlanExpectedFutureBenefitPaymentThereafter	5478000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets Projected Benefit Obligation DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation	15328000	USD
CY2021Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	15821000	USD
CY2021	us-gaap	Defined Contribution Plan Maximum Annual Contributions Per Employee Percent DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent	1	pure
CY2015Q1	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.045	pure
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent Of Match DefinedContributionPlanEmployerMatchingContributionPercentOfMatch	0.50	pure
CY2021	us-gaap	Defined Contribution Plan Employer Matching Contribution Percent DefinedContributionPlanEmployerMatchingContributionPercent	0.06	pure
CY2021	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	569000	USD
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	380000	USD
CY2021	fnwb	Employee Stock Ownership Plan Esop Requisite Service Period EmployeeStockOwnershipPlanEsopRequisiteServicePeriod	P12M
CY2021Q4	fnwb	Employee Stock Ownership Plan Esop Shares To Be Purchased Percentage EmployeeStockOwnershipPlanEsopSharesToBePurchasedPercentage	0.08	pure
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2021Q4	fnwb	Employee Stock Ownership Plan Esop Number Of Shares Purchased Percentage EmployeeStockOwnershipPlanEsopNumberOfSharesPurchasedPercentage	1	pure
CY2021	us-gaap	Employee Stock Ownership Plan Esop Weighted Average Purchase Price Of Shares Purchased EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased	12.45
CY2021	fnwb	Employee Stock Ownership Plan Esop Debt Structure Amortization Period EmployeeStockOwnershipPlanEsopDebtStructureAmortizationPeriod	P20Y
CY2021Q4	fnwb	Employee Stock Ownership Plan Esop Debt Structure Estimated Interest Rate EmployeeStockOwnershipPlanEsopDebtStructureEstimatedInterestRate	0.0246	pure
CY2021	fnwb	Employee Stock Ownership Plan Esop Principal And Interest Payments From Esop EmployeeStockOwnershipPlanEsopPrincipalAndInterestPaymentsFromEsop	835000	USD
CY2021	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	675000	USD
CY2020	fnwb	Employee Stock Ownership Plan Esop Compensation Expense Net Of Dividends Received EmployeeStockOwnershipPlanEsopCompensationExpenseNetOfDividendsReceived	475000	USD
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	333396
CY2020Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Allocated Shares EmployeeStockOwnershipPlanESOPNumberOfAllocatedShares	280507
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	26442
CY2020Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Committed To Be Released Shares EmployeeStockOwnershipPlanESOPNumberOfCommittedToBeReleasedShares	26442
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	688191
CY2020Q4	us-gaap	Employee Stock Ownership Plan Esop Number Of Suspense Shares EmployeeStockOwnershipPlanESOPNumberOfSuspenseShares	741080
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2020Q4	us-gaap	Employee Stock Ownership Plan Esop Shares In Esop EmployeeStockOwnershipPlanESOPSharesInESOP	1048029
CY2021Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	13901000	USD
CY2020Q4	us-gaap	Employee Stock Ownership Plan Esop Deferred Shares Fair Value EmployeeStockOwnershipPlanESOPDeferredSharesFairValue	11561000	USD
CY2015Q1	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.060	pure
CY2015Q1	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.080	pure
CY2015Q1	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.040	pure
CY2019Q1	fnwb	Excess Tier One Common Equity Capital Conservation Buffer ExcessTierOneCommonEquityCapitalConservationBuffer	0.025	pure
CY2021Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	196319000	USD
CY2021Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1379	pure
CY2021Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	64081000	USD
CY2021Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.0450	pure
CY2021Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	92562000	USD
CY2021Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.0650	pure
CY2021Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	196319000	USD
CY2021Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1379	pure
CY2021Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	85442000	USD
CY2021Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600	pure
CY2021Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	113923000	USD
CY2021Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.0800	pure
CY2021Q4	us-gaap	Capital Capital	211828000	USD
CY2021Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1488	pure
CY2021Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	113923000	USD
CY2021Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2021Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	142403000	USD
CY2021Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.1000	pure
CY2021Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	196319000	USD
CY2021Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1056	pure
CY2021Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	74362000	USD
CY2021Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2021Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	92953000	USD
CY2021Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.0500	pure
CY2019Q4	us-gaap	Common Equity Tier One Capital CommonEquityTierOneCapital	159842000	USD
CY2020Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.1340	pure
CY2020Q4	us-gaap	Common Equity Tier One Capital Required For Capital Adequacy CommonEquityTierOneCapitalRequiredForCapitalAdequacy	53678000	USD
CY2020Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Capital Adequacy Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum	0.0450	pure
CY2020Q4	us-gaap	Common Equity Tier One Capital Required To Be Well Capitalized CommonEquityTierOneCapitalRequiredToBeWellCapitalized	77535000	USD
CY2020Q4	us-gaap	Banking Regulation Common Equity Tier One Risk Based Capital Ratio Well Capitalized Minimum BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum	0.0650	pure
CY2019Q4	us-gaap	Tier One Risk Based Capital TierOneRiskBasedCapital	159842000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.1340	pure
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy TierOneRiskBasedCapitalRequiredForCapitalAdequacy	71571000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0600	pure
CY2020Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized TierOneRiskBasedCapitalRequiredToBeWellCapitalized	95427000	USD
CY2020Q4	us-gaap	Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.0800	pure
CY2019Q4	us-gaap	Capital Capital	173998000	USD
CY2020Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.1459	pure
CY2020Q4	us-gaap	Capital Required For Capital Adequacy CapitalRequiredForCapitalAdequacy	95427000	USD
CY2020Q4	us-gaap	Capital Required For Capital Adequacy To Risk Weighted Assets CapitalRequiredForCapitalAdequacyToRiskWeightedAssets	0.0800	pure
CY2020Q4	us-gaap	Capital Required To Be Well Capitalized CapitalRequiredToBeWellCapitalized	119284000	USD
CY2020Q4	us-gaap	Capital Required To Be Well Capitalized To Risk Weighted Assets CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	0.1000	pure
CY2019Q4	us-gaap	Tier One Leverage Capital TierOneLeverageCapital	159842000	USD
CY2020Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.1028	pure
CY2020Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy TierOneLeverageCapitalRequiredForCapitalAdequacy	62194000	USD
CY2020Q4	us-gaap	Tier One Leverage Capital Required For Capital Adequacy To Average Assets TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets	0.0400	pure
CY2020Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized TierOneLeverageCapitalRequiredToBeWellCapitalized	77742000	USD
CY2020Q4	us-gaap	Tier One Leverage Capital Required To Be Well Capitalized To Average Assets TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets	0.0500	pure
CY2021Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	3200000	USD
CY2020Q4	us-gaap	Related Party Deposit Liabilities RelatedPartyDepositLiabilities	3000000.0	USD
CY2021Q4	fnwb	Fair Value Measurement With Unobservable Inputs Reconciliation Discount FairValueMeasurementWithUnobservableInputsReconciliationDiscount	0	USD
CY2021	us-gaap	Net Income Loss NetIncomeLoss	15418000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	10340000	USD
CY2021	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	505000	USD
CY2020	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	292000	USD
CY2021	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	14913000	USD
CY2020	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10048000	USD
CY2021	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10151946
CY2020	us-gaap	Weighted Average Number Of Shares Issued Basic WeightedAverageNumberOfSharesIssuedBasic	10407042
CY2021	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	310088
CY2020	us-gaap	Weighted Average Number Of Shares Restricted Stock WeightedAverageNumberOfSharesRestrictedStock	270991
CY2021	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	707905
CY2020	us-gaap	Weighted Average Number Of Shares Employee Stock Ownership Plan Shares Not Committed To Be Released WeightedAverageNumberOfSharesEmployeeStockOwnershipPlanSharesNotCommittedToBeReleased	765273
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9133953
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9370778
CY2021	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9133953
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	9370778
CY2021	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	94787
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	31420
CY2021	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9228740
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	9402198
CY2021	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.63
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.07
CY2021	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.63
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.07

Files In Submission

Name	View Source	Status
0001437749-22-006713-index-headers.html	Edgar Link	pending
0001437749-22-006713-index.html	Edgar Link	pending
0001437749-22-006713.txt	Edgar Link	pending
0001437749-22-006713-xbrl.zip	Edgar Link	pending
ex_277404.htm	Edgar Link	pending
ex_277405.htm	Edgar Link	pending
ex_277406.htm	Edgar Link	pending
ex_277407.htm	Edgar Link	pending
ex_277408.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
fnwb-20211231.xsd	Edgar Link	pending
fnwb-20211231_cal.xml	Edgar Link	unprocessable
fnwb-20211231_def.xml	Edgar Link	unprocessable
fnwb-20211231_lab.xml	Edgar Link	unprocessable
fnwb-20211231_pre.xml	Edgar Link	unprocessable
fnwb20211231_10k.htm	Edgar Link	pending
fnwb20211231_10k_htm.xml	Edgar Link	completed
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
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
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
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$FNWB
First Northwest Bancorp Stock $fnwb

2021 Q4 Form 10-K Financial Statement

#000143774922006713 Filed on March 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNWB First Northwest Bancorp Stock $fnwb

2021 Q4 Form 10-K Financial Statement

#000143774922006713 Filed on March 18, 2022

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FNWB
First Northwest Bancorp Stock $fnwb