$FSBW
FS Bancorp, Inc. Stock $fsbw

$fsbw Overview Financials Valuation SEC Filings Company Website

2024 Q4 Form 10-Q Financial Statement

#000143774924034233 Filed on November 08, 2024

Income Statement

Concept	2024 Q4	2024 Q3
Revenue		$47.04M
YoY Change		3693.79%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin		$3.827M
YoY Change		12.26%
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization		$2.174M
YoY Change		-34.12%
% of Gross Profit
Operating Expenses		$3.827M
YoY Change		12.26%
Operating Profit
YoY Change
Interest Expense
YoY Change
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income		$9.866M
YoY Change		-14.07%
Income Tax		-$420.0K
% Of Pretax Income		-4.26%
Net Earnings		$10.29M
YoY Change		14.89%
Net Earnings / Revenue		21.87%
Basic Earnings Per Share		$1.32
Diluted Earnings Per Share		$1.29
COMMON SHARES
Basic Shares Outstanding	7.817M	7.748M
Diluted Shares Outstanding		7.854M

Balance Sheet

Concept	2024 Q4	2024 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents		$40.34M
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		$30.03M
YoY Change		-2.91%
Goodwill		$3.600M
YoY Change		0.0%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets		$4.222M
YoY Change		-42.95%
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets		$2.970B
YoY Change		1.72%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses		$5.548M
YoY Change		-24.0%
Deferred Revenue
YoY Change
Short-Term Debt		$163.8M
YoY Change		34.38%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities		$5.548M
YoY Change		-24.0%
LONG-TERM LIABILITIES
Long-Term Debt		$49.58M
YoY Change		0.16%
Other Long-Term Liabilities		$35.04M
YoY Change		-3.46%
Total Long-Term Liabilities		$84.62M
YoY Change		-1.37%
TOTAL LIABILITIES
Total Short-Term Liabilities		$5.548M
Total Long-Term Liabilities		$84.62M
Total Liabilities		$2.681B
YoY Change		0.45%
SHAREHOLDERS EQUITY
Retained Earnings		$251.8M
YoY Change		13.17%
Common Stock		$78.00K
YoY Change		0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity		$288.9M
YoY Change
Total Liabilities & Shareholders Equity		$2.970B
YoY Change		1.72%

Cashflow Statement

Concept	2024 Q4	2024 Q3
OPERATING ACTIVITIES
Net Income		$10.29M
YoY Change		14.89%
Depreciation, Depletion And Amortization		$2.174M
YoY Change		-34.12%
Cash From Operating Activities		-$629.0K
YoY Change		-102.76%
INVESTING ACTIVITIES
Capital Expenditures		$621.0K
YoY Change		107.0%
Acquisitions
YoY Change
Other Investing Activities		-$14.71M
YoY Change		-82.29%
Cash From Investing Activities		-$15.34M
YoY Change		-81.61%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities		23.29M
YoY Change		155.97%
NET CHANGE
Cash From Operating Activities		-629.0K
Cash From Investing Activities		-15.34M
Cash From Financing Activities		23.29M
Net Change In Cash		7.329M
YoY Change		-114.23%
FREE CASH FLOW
Cash From Operating Activities		-$629.0K
Capital Expenditures		$621.0K
Free Cash Flow		-$1.250M
YoY Change		-105.56%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Registrant Name EntityRegistrantName	FS Bancorp, Inc.
	dei	Entity Central Index Key EntityCentralIndexKey	0001530249
	dei	Amendment Flag AmendmentFlag	false
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2024
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	252272000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	328695000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	7983000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	7666000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31232000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31534000	usd
CY2024Q3	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	13861000	usd
CY2023Q4	us-gaap	Loans Receivable Fair Value Disclosure LoansReceivableFairValueDisclosure	15088000	usd
CY2024Q3	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2023Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies		usd
CY2024Q3	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2024Q3	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2023Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	5000000
CY2024Q3	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2024Q3	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2023Q4	us-gaap	Preferred Stock Shares Issued PreferredStockSharesIssued	0
CY2023Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2024Q3	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2023Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2024Q3	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	45000000
CY2023Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	45000000
CY2024Q3	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	7817172
CY2024Q3	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7817172
CY2023Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	7800545
CY2023Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	7800545
CY2023Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.25
CY2024Q3	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.27
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.75
	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.79
CY2023Q4	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0	usd
CY2023	fsbw	Expected Credit Losses On Investments ExpectedCreditLossesOnInvestments	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	-0	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2024Q3	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss Statement Of Financial Position Extensible List FinancingReceivableAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList	http://fasb.org/us-gaap/2024#InterestReceivable
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CY2023Q3	fsbw	Financing Receivable Modified Subsequent Default Number Of Contracts FinancingReceivableModifiedSubsequentDefaultNumberOfContracts	0	pure
	fsbw	Financing Receivable Modified Subsequent Default Number Of Contracts FinancingReceivableModifiedSubsequentDefaultNumberOfContracts	0	pure
	fsbw	Financing Receivable Modified Subsequent Default Number Of Contracts FinancingReceivableModifiedSubsequentDefaultNumberOfContracts	0	pure
CY2023Q4	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	usd
CY2024Q3	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P5Y
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	pure
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3372000	usd
	us-gaap	Noninterest Expense NoninterestExpense	71314000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6915000	usd
CY2023Q4	us-gaap	Goodwill Goodwill	3600000	usd
CY2024Q3	ecd	Rule10b51 Arr Adopted Flag Rule10b51ArrAdoptedFlag	false
CY2024Q3	ecd	Rule10b51 Arr Trmntd Flag Rule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Trmntd Flag NonRule10b51ArrTrmntdFlag	false
CY2024Q3	ecd	Non Rule10b51 Arr Adopted Flag NonRule10b51ArrAdoptedFlag	false
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2024-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	001-35589
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	WA
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	45-4585178
	dei	Entity Address Address Line1 EntityAddressAddressLine1	6920 220th Street SW
	dei	Entity Address City Or Town EntityAddressCityOrTown	Mountlake Terrace
	dei	Entity Address State Or Province EntityAddressStateOrProvince	WA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	98043
	dei	City Area Code CityAreaCode	425
	dei	Local Phone Number LocalPhoneNumber	771‑5299
	dei	Security12b Title Security12bTitle	Common Stock, par value $.01 per share
	dei	Trading Symbol TradingSymbol	FSBW
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	true
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
CY2024Q4	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	7817172
CY2024Q3	us-gaap	Cash And Due From Banks CashAndDueFromBanks	17950000	usd
CY2023Q4	us-gaap	Cash And Due From Banks CashAndDueFromBanks	17083000	usd
CY2024Q3	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	22390000	usd
CY2023Q4	us-gaap	Interest Bearing Deposits In Banks InterestBearingDepositsInBanks	48608000	usd
CY2024Q3	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	40340000	usd
CY2023Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	65691000	usd
CY2024Q3	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	12001000	usd
CY2023Q4	us-gaap	Certificates Of Deposit At Carrying Value CertificatesOfDepositAtCarryingValue	24167000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	228199000	usd
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CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest After Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestAfterAllowanceForCreditLoss	8455000	usd
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CY2024Q3	us-gaap	Loans Held For Sale Fair Value Disclosure LoansHeldForSaleFairValueDisclosure	49373000	usd
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CY2024Q3	us-gaap	Interest Receivable InterestReceivable	14014000	usd
CY2023Q4	us-gaap	Interest Receivable InterestReceivable	14005000	usd
CY2024Q3	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	30026000	usd
CY2023Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	30578000	usd
CY2024Q3	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	5365000	usd
CY2023Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	6627000	usd
CY2024Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	9504000	usd
CY2023Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	2114000	usd
CY2024Q3	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	4222000	usd
CY2023Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	6725000	usd
CY2024Q3	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	38453000	usd
CY2023Q4	us-gaap	Bank Owned Life Insurance BankOwnedLifeInsurance	37719000	usd
CY2024Q3	fsbw	Mortgage Servicing Asset Held For Sale MortgageServicingAssetHeldForSale	0	usd
CY2023Q4	fsbw	Mortgage Servicing Asset Held For Sale MortgageServicingAssetHeldForSale	8086000	usd
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	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	137863000	usd
	us-gaap	Interest And Dividend Income Operating InterestAndDividendIncomeOperating	122749000	usd
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	us-gaap	Interest Expense Deposits InterestExpenseDeposits	39620000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	24696000	usd
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	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	4796000	usd
	us-gaap	Interest Expense Federal Home Loan Bank And Federal Reserve Bank Advances Long Term InterestExpenseFederalHomeLoanBankAndFederalReserveBankAdvancesLongTerm	3749000	usd
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	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	1456000	usd
	us-gaap	Interest Expense Subordinated Notes And Debentures InterestExpenseSubordinatedNotesAndDebentures	1456000	usd
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CY2023Q3	us-gaap	Interest Expense Operating InterestExpenseOperating	12636000	usd
	us-gaap	Interest Expense Operating InterestExpenseOperating	45872000	usd
	us-gaap	Interest Expense Operating InterestExpenseOperating	29901000	usd
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	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	91991000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	92848000	usd
CY2024Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1513000	usd
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	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3989000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3372000	usd
CY2024Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	29731000	usd
CY2023Q3	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	30086000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	88002000	usd
	us-gaap	Interest Income Expense After Provision For Loan Loss InterestIncomeExpenseAfterProvisionForLoanLoss	89476000	usd
CY2024Q3	us-gaap	Fee Income FeeIncome	2482000	usd
CY2023Q3	us-gaap	Fee Income FeeIncome	2882000	usd
	us-gaap	Fee Income FeeIncome	7513000	usd
	us-gaap	Fee Income FeeIncome	8352000	usd
CY2024Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	2523000	usd
CY2023Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1875000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6824000	usd
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	5298000	usd
CY2024Q3	fsbw	Gain Loss On Disposition Of Mortgage Servicing Rights Msr GainLossOnDispositionOfMortgageServicingRightsMsr	141000	usd
CY2023Q3	fsbw	Gain Loss On Disposition Of Mortgage Servicing Rights Msr GainLossOnDispositionOfMortgageServicingRightsMsr	0	usd
	fsbw	Gain Loss On Disposition Of Mortgage Servicing Rights Msr GainLossOnDispositionOfMortgageServicingRightsMsr	8356000	usd
	fsbw	Gain Loss On Disposition Of Mortgage Servicing Rights Msr GainLossOnDispositionOfMortgageServicingRightsMsr	0	usd
CY2024Q3	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	11000	usd
CY2023Q3	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	0	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-7836000	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	0	usd
CY2024Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	252000	usd
CY2023Q3	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	233000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	734000	usd
	us-gaap	Bank Owned Life Insurance Income BankOwnedLifeInsuranceIncome	681000	usd
CY2024Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	558000	usd
CY2023Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	-8000	usd
	us-gaap	Noninterest Income Other NoninterestIncomeOther	1355000	usd
	us-gaap	Noninterest Income Other NoninterestIncomeOther	703000	usd
CY2024Q3	us-gaap	Noninterest Income NoninterestIncome	5967000	usd
CY2023Q3	us-gaap	Noninterest Income NoninterestIncome	4982000	usd
	us-gaap	Noninterest Income NoninterestIncome	16946000	usd
	us-gaap	Noninterest Income NoninterestIncome	15034000	usd
CY2024Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	13985000	usd
CY2023Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	13503000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40920000	usd
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	40880000	usd
CY2024Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	3827000	usd
CY2023Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	3409000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	10354000	usd
	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	9744000	usd
CY2024Q3	us-gaap	Occupancy Net OccupancyNet	1662000	usd
CY2023Q3	us-gaap	Occupancy Net OccupancyNet	1588000	usd
	us-gaap	Occupancy Net OccupancyNet	5036000	usd
	us-gaap	Occupancy Net OccupancyNet	4670000	usd
CY2024Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	2156000	usd
CY2023Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	1841000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	6172000	usd
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	5092000	usd
CY2024Q3	us-gaap	Loan Processing Fee LoanProcessingFee	666000	usd
CY2023Q3	us-gaap	Loan Processing Fee LoanProcessingFee	564000	usd
	us-gaap	Loan Processing Fee LoanProcessingFee	1904000	usd
	us-gaap	Loan Processing Fee LoanProcessingFee	2077000	usd
CY2024Q3	us-gaap	Professional Fees ProfessionalFees	1223000	usd
CY2023Q3	us-gaap	Professional Fees ProfessionalFees	666000	usd
	us-gaap	Professional Fees ProfessionalFees	3034000	usd
	us-gaap	Professional Fees ProfessionalFees	2001000	usd
CY2024Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	533000	usd
CY2023Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	561000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1515000	usd
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	1732000	usd
CY2024Q3	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	377000	usd
CY2023Q3	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	452000	usd
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	981000	usd
	us-gaap	Marketing And Advertising Expense MarketingAndAdvertisingExpense	1072000	usd
CY2024Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	usd
CY2023Q3	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	usd
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	0	usd
	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	1562000	usd
CY2024Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	897000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1002000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2757000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2484000	usd
CY2024Q3	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	506000	usd
CY2023Q3	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	0	usd
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	545000	usd
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	0	usd
CY2024Q3	us-gaap	Noninterest Expense NoninterestExpense	25832000	usd
CY2023Q3	us-gaap	Noninterest Expense NoninterestExpense	23586000	usd
	us-gaap	Noninterest Expense NoninterestExpense	73218000	usd
	us-gaap	Noninterest Expense NoninterestExpense	71314000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9866000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	11482000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31730000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	33196000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-420000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2529000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4088000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	6915000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	10286000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	8953000	usd
	us-gaap	Net Income Loss NetIncomeLoss	27642000	usd
	us-gaap	Net Income Loss NetIncomeLoss	26281000	usd
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.32
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.54
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.38
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.29
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.13
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.45
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	10286000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	8953000	usd
	us-gaap	Net Income Loss NetIncomeLoss	27642000	usd
	us-gaap	Net Income Loss NetIncomeLoss	26281000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	5404000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-11762000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	3853000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	-9341000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	1161000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2528000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	828000	usd
	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-2007000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	11000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-0	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-7836000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax	-0	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	2000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	-1685000	usd
	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax	0	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-7742000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	4337000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	-1270000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification And Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax	8155000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-1664000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	933000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	-273000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationTax	1753000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1151000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	1446000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	4021000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Before Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax	3624000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	248000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	311000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	865000	usd
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationTax	779000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2747000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6965000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5023000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3777000	usd
CY2024Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	7539000	usd
CY2023Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1988000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	32665000	usd
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	22504000	usd
CY2023Q2	us-gaap	Stockholders Equity StockholdersEquity	249933000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	8953000	usd
CY2023Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	1940000	usd
CY2023Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	590000	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	242000	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2023Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	-0	usd
CY2023Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	339000	usd
CY2023Q3	fsbw	Stock Issued During Period Value Stock Options Exercised Net StockIssuedDuringPeriodValueStockOptionsExercisedNet	-191000	usd
CY2023Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-6965000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	250665000	usd
CY2024Q2	us-gaap	Stockholders Equity StockholdersEquity	284026000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	10286000	usd
CY2024Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	2094000	usd
CY2024Q3	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	464000	usd
CY2024Q3	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	252000	usd
CY2024Q3	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
CY2024Q3	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	386000	usd
CY2024Q3	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	147000	usd
CY2024Q3	fsbw	Stock Issued During Period Value Stock Options Exercised Net StockIssuedDuringPeriodValueStockOptionsExercisedNet	752000	usd
CY2024Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-2747000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	288902000	usd
CY2022Q4	us-gaap	Stockholders Equity StockholdersEquity	231697000	usd
	us-gaap	Net Income Loss NetIncomeLoss	26281000	usd
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	5814000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1608000	usd
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	781000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	-0	usd
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	355000	usd
	fsbw	Stock Issued During Period Value Stock Options Exercised Net StockIssuedDuringPeriodValueStockOptionsExercisedNet	-244000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-3777000	usd
CY2023Q3	us-gaap	Stockholders Equity StockholdersEquity	250665000	usd
CY2023Q4	us-gaap	Stockholders Equity StockholdersEquity	264488000	usd
	us-gaap	Net Income Loss NetIncomeLoss	27642000	usd
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	6153000	usd
	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	1248000	usd
	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	832000	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	0	usd
	us-gaap	Stock Issued During Period Value Restricted Stock Award Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardForfeitures	-0	usd
	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	386000	usd
	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	2508000	usd
	fsbw	Stock Issued During Period Value Stock Options Exercised Net StockIssuedDuringPeriodValueStockOptionsExercisedNet	1284000	usd
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	5023000	usd
CY2024Q3	us-gaap	Stockholders Equity StockholdersEquity	288902000	usd
	us-gaap	Net Income Loss NetIncomeLoss	27642000	usd
	us-gaap	Net Income Loss NetIncomeLoss	26281000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3989000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3372000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	7948000	usd
	us-gaap	Depreciation Amortization And Accretion Net DepreciationAmortizationAndAccretionNet	9505000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1248000	usd
	us-gaap	Share Based Compensation ShareBasedCompensation	1608000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	734000	usd
	us-gaap	Life Insurance Corporate Or Bank Owned Change In Value LifeInsuranceCorporateOrBankOwnedChangeInValue	681000	usd
	fsbw	Gain Loss On Sale Of Loans Held For Sale GainLossOnSaleOfLoansHeldForSale	6824000	usd
	fsbw	Gain Loss On Sale Of Loans Held For Sale GainLossOnSaleOfLoansHeldForSale	5298000	usd
	fsbw	Gain Loss On Disposition Of Mortgage Servicing Rights Msr GainLossOnDispositionOfMortgageServicingRightsMsr	8356000	usd
	fsbw	Gain Loss On Disposition Of Mortgage Servicing Rights Msr GainLossOnDispositionOfMortgageServicingRightsMsr	-0	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-7836000	usd
	us-gaap	Debt And Equity Securities Realized Gain Loss DebtAndEquitySecuritiesRealizedGainLoss	-0	usd
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	426672000	usd
	us-gaap	Payments For Origination Of Mortgage Loans Held For Sale PaymentsForOriginationOfMortgageLoansHeldForSale	292309000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	430421000	usd
	us-gaap	Proceeds From Sale Of Loans Held For Sale ProceedsFromSaleOfLoansHeldForSale	324083000	usd
	fsbw	Gain Loss On Purchase Of Tax Credits GainLossOnPurchaseOfTaxCredits	2262000	usd
	fsbw	Gain Loss On Purchase Of Tax Credits GainLossOnPurchaseOfTaxCredits	-0	usd
	fsbw	Payments To Acquire Tax Credits PaymentsToAcquireTaxCredits	26007000	usd
	fsbw	Payments To Acquire Tax Credits PaymentsToAcquireTaxCredits	-0	usd
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	545000	usd
	us-gaap	Mortgage Servicing Rights Msr Impairment Recovery MortgageServicingRightsMSRImpairmentRecovery	0	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	9000	usd
	us-gaap	Increase Decrease In Accrued Interest Receivable Net IncreaseDecreaseInAccruedInterestReceivableNet	2251000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-3758000	usd
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	4074000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-2781000	usd
	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	4798000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	9742000	usd
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	65034000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	101907000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	13403000	usd
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	13492000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	47729000	usd
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	46906000	usd
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	14874000	usd
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	0	usd
	us-gaap	Payments To Acquire Restricted Certificates Of Deposit PaymentsToAcquireRestrictedCertificatesOfDeposit	2708000	usd
	us-gaap	Payments To Acquire Restricted Certificates Of Deposit PaymentsToAcquireRestrictedCertificatesOfDeposit	12924000	usd
	fsbw	Payments For Origination Of Loans And Principle Collections Net PaymentsForOriginationOfLoansAndPrincipleCollectionsNet	37873000	usd
	fsbw	Payments For Origination Of Loans And Principle Collections Net PaymentsForOriginationOfLoansAndPrincipleCollectionsNet	150385000	usd
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	usd
	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	336157000	usd
	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	16311000	usd
	us-gaap	Proceeds From Sale Of Mortgage Servicing Rights Msr ProceedsFromSaleOfMortgageServicingRightsMSR	0	usd
	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	50099000	usd
	us-gaap	Payments To Acquire Loans Held For Investment PaymentsToAcquireLoansHeldForInvestment	2475000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1253000	usd
	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1395000	usd
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	7390000	usd
	us-gaap	Payments For Proceeds From Federal Home Loan Bank Stock PaymentsForProceedsFromFederalHomeLoanBankStock	-6915000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-557000	usd
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	142479000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-95097000	usd
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	-98500000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	707768000	usd
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	1725337000	usd
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	637708000	usd
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	1789970000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	6153000	usd
	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	5814000	usd
	fsbw	Proceeds Disbursements From Stock Options Exercised ProceedsDisbursementsFromStockOptionsExercised	-1284000	usd
	fsbw	Proceeds Disbursements From Stock Options Exercised ProceedsDisbursementsFromStockOptionsExercised	244000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	386000	usd
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	355000	usd
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	832000	usd
	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	781000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	2508000	usd
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	-0	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-34536000	usd
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-168277000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-25351000	usd
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	39236000	usd
CY2023Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	65691000	usd
CY2022Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	41437000	usd
CY2024Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	40340000	usd
CY2023Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations	80673000	usd
	us-gaap	Interest Paid Net InterestPaidNet	47071000	usd
	us-gaap	Interest Paid Net InterestPaidNet	26280000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	2435000	usd
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	8355000	usd
	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	11689000	usd
	us-gaap	Debt Securities Available For Sale Unrealized Gain Loss DebtSecuritiesAvailableForSaleUnrealizedGainLoss	-9341000	usd
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	-5288000	usd
	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	4523000	usd
	fsbw	Unrealized Gain Loss On Portfolio Loans Measured Under Fair Value Option UnrealizedGainLossOnPortfolioLoansMeasuredUnderFairValueOption	448000	usd
	fsbw	Unrealized Gain Loss On Portfolio Loans Measured Under Fair Value Option UnrealizedGainLossOnPortfolioLoansMeasuredUnderFairValueOption	-285000	usd
	fsbw	Retention Of Gross Mortgage Servicing Rights From Loan Sales RetentionOfGrossMortgageServicingRightsFromLoanSales	1891000	usd
	fsbw	Retention Of Gross Mortgage Servicing Rights From Loan Sales RetentionOfGrossMortgageServicingRightsFromLoanSales	2279000	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	0	usd
	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	2034000	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	0	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	87512000	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	0	usd
	us-gaap	Noncash Or Part Noncash Acquisition Value Of Liabilities Assumed1 NoncashOrPartNoncashAcquisitionValueOfLiabilitiesAssumed1	424949000	usd
CY2024Q3	fsbw	Number Of Bank Branches NumberOfBankBranches	27	pure
	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	pure
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	252272000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	439000	usd
CY2024Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	24512000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	228199000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	8500000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0	usd
CY2024Q3	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	517000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	7983000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Excluding Accrued Interest Amortized Cost Before Allowance For Credit Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityExcludingAccruedInterestAmortizedCostBeforeAllowanceForCreditLoss	260772000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale And Held To Maturity Cumulative Unrecognized Gain DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain	439000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale And Held To Maturity Cumulative Unrecognized Loss DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss	25029000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Fair Value Excluding Accrued Interest DebtSecuritiesAvailableforsaleAndHeldtomaturityFairValueExcludingAccruedInterest	236182000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableforsaleAndHeldtomaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	328695000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	939000	usd
CY2023Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	36701000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	292933000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	8500000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Gain HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain	0	usd
CY2023Q4	us-gaap	Held To Maturity Securities Accumulated Unrecognized Holding Loss HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss	834000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Fair Value HeldToMaturitySecuritiesFairValue	7666000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Excluding Accrued Interest Amortized Cost Before Allowance For Credit Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityExcludingAccruedInterestAmortizedCostBeforeAllowanceForCreditLoss	337195000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity Cumulative Unrecognized Gain DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedGain	939000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale And Held To Maturity Cumulative Unrecognized Loss DebtSecuritiesAvailableForSaleAndHeldToMaturityCumulativeUnrecognizedLoss	37535000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Fair Value Excluding Accrued Interest DebtSecuritiesAvailableforsaleAndHeldtomaturityFairValueExcludingAccruedInterest	300599000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableforsaleAndHeldtomaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2024Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q2	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	31000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityExcludingAccruedInterestCreditLossExpenseReversal	0	usd
CY2023Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityExcludingAccruedInterestCreditLossExpenseReversal	14000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2022Q4	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	31000	usd
	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityExcludingAccruedInterestCreditLossExpenseReversal	0	usd
	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Credit Loss Expense Reversal DebtSecuritiesHeldToMaturityExcludingAccruedInterestCreditLossExpenseReversal	14000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2023Q3	us-gaap	Debt Securities Held To Maturity Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesHeldToMaturityAllowanceForCreditLossExcludingAccruedInterest	45000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestBeforeAllowanceForCreditLoss	117000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityAccruedInterestBeforeAllowanceForCreditLoss	116000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	1400000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Accrued Interest After Allowance For Credit Loss DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss	1500000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	8500000	usd
CY2023Q4	us-gaap	Debt Securities Held To Maturity Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesHeldToMaturityExcludingAccruedInterestBeforeAllowanceForCreditLoss	8500000	usd
CY2024Q3	us-gaap	Debt Securities Held To Maturity Nonaccrual DebtSecuritiesHeldToMaturityNonaccrual	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	17206000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	218000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	166120000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	24294000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	183326000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	24512000	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Fair Value1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValue1	0	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss1	-0	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Fair Value1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue1	7983000	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss1	517000	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Unrealized Loss Position Fair Value1 DebtSecuritiesHeldtomaturityUnrealizedLossPositionFairValue1	7983000	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Unrealized Loss Position Accumulated Loss1 DebtSecuritiesHeldtomaturityUnrealizedLossPositionAccumulatedLoss1	517000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Fair Value DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValue	17206000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	218000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Fair Value DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	174103000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	24811000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Fair Value Total DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionFairValueTotal	191309000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Accumulated Loss Total DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionAccumulatedLossTotal	25029000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	58754000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	637000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	209362000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	36064000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	268116000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	36701000	usd
CY2023Q4	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Fair Value1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValue1	0	usd
CY2023Q4	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss1	-0	usd
CY2023Q4	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Fair Value1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue1	7666000	usd
CY2023Q4	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss1 DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss1	834000	usd
CY2023Q4	fsbw	Debt Securities Heldtomaturity Unrealized Loss Position Fair Value1 DebtSecuritiesHeldtomaturityUnrealizedLossPositionFairValue1	7666000	usd
CY2023Q4	fsbw	Debt Securities Heldtomaturity Unrealized Loss Position Accumulated Loss1 DebtSecuritiesHeldtomaturityUnrealizedLossPositionAccumulatedLoss1	834000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Fair Value DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValue	58754000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	637000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Fair Value DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValue	217028000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	36898000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Fair Value Total DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionFairValueTotal	275782000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Continuous Unrealized Loss Position Accumulated Loss Total DebtSecuritiesAvailableforsaleAndHeldtomaturityContinuousUnrealizedLossPositionAccumulatedLossTotal	37535000	usd
CY2024Q3	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	0	pure
CY2024Q3	fsbw	Debt Securities Heldtomaturity Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesHeldtomaturityContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	7	pure
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions	7	pure
CY2024Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Number Of Positions DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions	124	pure
	fsbw	Expected Credit Losses On Investments ExpectedCreditLossesOnInvestments	0	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	252272000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	228199000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	328695000	usd
CY2023Q4	us-gaap	Debt Securities Available For Sale Excluding Accrued Interest DebtSecuritiesAvailableForSaleExcludingAccruedInterest	292933000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	8500000	usd
CY2024Q3	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	7983000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Amortized Cost Basis HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis	8500000	usd
CY2023Q4	us-gaap	Held To Maturity Securities Debt Maturities Single Maturity Date Fair Value HeldToMaturitySecuritiesDebtMaturitiesSingleMaturityDateFairValue	7666000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Excluding Accrued Interest Amortized Cost Before Allowance For Credit Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityExcludingAccruedInterestAmortizedCostBeforeAllowanceForCreditLoss	260772000	usd
CY2024Q3	fsbw	Debt Securities Availableforsale And Heldtomaturity Fair Value Excluding Accrued Interest DebtSecuritiesAvailableforsaleAndHeldtomaturityFairValueExcludingAccruedInterest	236182000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Excluding Accrued Interest Amortized Cost Before Allowance For Credit Loss DebtSecuritiesAvailableforsaleAndHeldtomaturityExcludingAccruedInterestAmortizedCostBeforeAllowanceForCreditLoss	337195000	usd
CY2023Q4	fsbw	Debt Securities Availableforsale And Heldtomaturity Fair Value Excluding Accrued Interest DebtSecuritiesAvailableforsaleAndHeldtomaturityFairValueExcludingAccruedInterest	300599000	usd
CY2024Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	3448000	usd
CY2024Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	11000	usd
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	101907000	usd
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	215000	usd
	us-gaap	Debt Securities Available For Sale Realized Loss DebtSecuritiesAvailableForSaleRealizedLoss	8051000	usd
CY2023Q3	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	0	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	2494929000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	2433015000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31232000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31534000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	2463697000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	2401481000	usd
CY2024Q3	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	-5900000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Loan Fee Cost FinancingReceivableUnamortizedLoanFeeCost	-8400000	usd
CY2024Q3	us-gaap	Financing Receivable Unamortized Purchase Premium Discount FinancingReceivableUnamortizedPurchasePremiumDiscount	2100000	usd
CY2023Q4	us-gaap	Financing Receivable Unamortized Purchase Premium Discount FinancingReceivableUnamortizedPurchasePremiumDiscount	2600000	usd
CY2024Q3	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	11800000	usd
CY2023Q4	us-gaap	Financing Receivable Accrued Interest After Allowance For Credit Loss FinancingReceivableAccruedInterestAfterAllowanceForCreditLoss	11500000	usd
CY2024Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31238000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	1591000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	1964000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	367000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	1597000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31232000	usd
CY2023Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	30350000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	684000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	830000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	297000	usd
CY2023Q3	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	533000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	30501000	usd
CY2023Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31534000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	4013000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	5606000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	1291000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	4315000	usd
CY2024Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	31232000	usd
CY2022Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	27992000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Credit Loss Expense Reversal FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal	4102000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	2426000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery	833000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff After Recovery FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffAfterRecovery	1593000	usd
CY2023Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	30501000	usd
CY2024Q3	fsbw	Financing Receivable Modified Subsequent Default Number Of Contracts FinancingReceivableModifiedSubsequentDefaultNumberOfContracts	0	pure
CY2024Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	0	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	2494929000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10772000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	2433015000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10952000	usd
CY2024Q3	us-gaap	Financing Receivable Recorded Investment90 Days Past Due And Still Accruing FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing	0	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	332148000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	439881000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	567580000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	413423000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	244479000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	279701000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	216115000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan	1602000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	2494929000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff	235000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	1075000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	1271000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	545000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	628000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	979000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Writeoff FinancingReceivableExcludingAccruedInterestRevolvingWriteoff	873000	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan Writeoff FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff	0	usd
	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	5606000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear	491485000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear	674717000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear	464272000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear	257540000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear	134306000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear	196511000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving FinancingReceivableExcludingAccruedInterestRevolving	213241000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan	943000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	2433015000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year One Originated Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff	204000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Two Originated Fiscal Year Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff	1435000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Three Originated Two Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff	673000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Four Originated Three Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff	290000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Year Five Originated Four Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff	152000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Originated More Than Five Years Before Current Fiscal Year Writeoff FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff	592000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Writeoff FinancingReceivableExcludingAccruedInterestRevolvingWriteoff	130000	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Revolving Converted To Term Loan Writeoff FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff	0	usd
CY2023	us-gaap	Financing Receivable Excluding Accrued Interest Allowance For Credit Loss Writeoff FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff	3476000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	3102000	usd
CY2024Q3	fsbw	Financing Receivable Excluding Accrued Interest Nonaccrual With Allowance FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowance	7670000	usd
CY2024Q3	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10772000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual No Allowance FinancingReceivableExcludingAccruedInterestNonaccrualNoAllowance	1357000	usd
CY2023Q4	fsbw	Financing Receivable Excluding Accrued Interest Nonaccrual With Allowance FinancingReceivableExcludingAccruedInterestNonaccrualWithAllowance	9595000	usd
CY2023Q4	us-gaap	Financing Receivable Excluding Accrued Interest Nonaccrual FinancingReceivableExcludingAccruedInterestNonaccrual	10952000	usd
CY2024Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	41000	usd
CY2023Q3	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	55000	usd
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	244000	usd
	us-gaap	Financing Receivable Nonaccrual Interest Income FinancingReceivableNonaccrualInterestIncome	164000	usd
CY2024Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	464000	usd
CY2023Q3	us-gaap	Operating Lease Cost OperatingLeaseCost	476000	usd
CY2024Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	2000	usd
CY2023Q3	us-gaap	Short Term Lease Cost ShortTermLeaseCost	5000	usd
CY2024Q3	us-gaap	Lease Cost LeaseCost	466000	usd
CY2023Q3	us-gaap	Lease Cost LeaseCost	481000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	1414000	usd
	us-gaap	Operating Lease Cost OperatingLeaseCost	1357000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	10000	usd
	us-gaap	Short Term Lease Cost ShortTermLeaseCost	14000	usd
	us-gaap	Lease Cost LeaseCost	1424000	usd
	us-gaap	Lease Cost LeaseCost	1371000	usd
CY2024Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	483000	usd
CY2023Q3	us-gaap	Operating Lease Payments OperatingLeasePayments	486000	usd
CY2024Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y6M
CY2023Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y2M12D
CY2024Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0301	pure
CY2023Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0293	pure
	us-gaap	Operating Lease Payments OperatingLeasePayments	1462000	usd
	us-gaap	Operating Lease Payments OperatingLeasePayments	1392000	usd
CY2024Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y6M
CY2023Q3	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P4Y2M12D
CY2024Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0301	pure
CY2023Q3	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0293	pure
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Remainder Of Fiscal Year LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear	479000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	1628000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	1475000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	1173000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	428000	usd
CY2024Q3	fsbw	Lessee Operating Lease Liability To Be Paid After Year Four LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	954000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	6137000	usd
CY2024Q3	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	589000	usd
CY2024Q3	us-gaap	Operating Lease Liability OperatingLeaseLiability	5548000	usd
CY2024Q2	us-gaap	Other Real Estate OtherRealEstate	0	usd
CY2023Q2	us-gaap	Other Real Estate OtherRealEstate	570000	usd
CY2023Q4	us-gaap	Other Real Estate OtherRealEstate	0	usd
CY2022Q4	us-gaap	Other Real Estate OtherRealEstate	570000	usd
CY2024Q3	us-gaap	Other Real Estate Additions OtherRealEstateAdditions	0	usd
CY2023Q3	us-gaap	Other Real Estate Additions OtherRealEstateAdditions	0	usd
	us-gaap	Other Real Estate Additions OtherRealEstateAdditions	0	usd
	us-gaap	Other Real Estate Additions OtherRealEstateAdditions	0	usd
CY2024Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	usd
CY2023Q3	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	usd
	us-gaap	Transfer To Other Real Estate TransferToOtherRealEstate	0	usd
CY2024Q3	us-gaap	Other Real Estate OtherRealEstate	0	usd
CY2023Q3	us-gaap	Other Real Estate OtherRealEstate	570000	usd
CY2024Q3	us-gaap	Other Real Estate OtherRealEstate	0	usd
CY2023Q3	us-gaap	Other Real Estate OtherRealEstate	570000	usd
CY2024Q3	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	641270000	usd
CY2023Q4	us-gaap	Noninterest Bearing Domestic Deposit Checking NoninterestBearingDomesticDepositChecking	654048000	usd
CY2024Q3	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	165944000	usd
CY2023Q4	us-gaap	Interest Bearing Domestic Deposit Checking InterestBearingDomesticDepositChecking	244028000	usd
CY2024Q3	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	151364000	usd
CY2023Q4	us-gaap	Deposits Savings Deposits DepositsSavingsDeposits	151630000	usd
CY2024Q3	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	340049000	usd
CY2023Q4	us-gaap	Deposits Money Market Deposits DepositsMoneyMarketDeposits	359063000	usd
CY2024Q3	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	533441000	usd
CY2023Q4	us-gaap	Time Deposits Less Than100000 TimeDepositsLessThan100000	587858000	usd
CY2024Q3	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	452705000	usd
CY2023Q4	us-gaap	Time Deposits100000 Or More TimeDeposits100000OrMore	429373000	usd
CY2024Q3	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	126075000	usd
CY2023Q4	us-gaap	Time Deposits At Or Above Fdic Insurance Limit TimeDepositsAtOrAboveFDICInsuranceLimit	79540000	usd
CY2024Q3	fsbw	Noninterestbearing Deposit Escrow For Mortgages Serviced NoninterestbearingDepositEscrowForMortgagesServiced	16483000	usd
CY2023Q4	fsbw	Noninterestbearing Deposit Escrow For Mortgages Serviced NoninterestbearingDepositEscrowForMortgagesServiced	16783000	usd
CY2024Q3	us-gaap	Deposits Deposits	2427331000	usd
CY2023Q4	us-gaap	Deposits Deposits	2522323000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Remainder Of Fiscal Year TimeDepositMaturitiesRemainderOfFiscalYear	415152000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Year One TimeDepositMaturitiesYearOne	566388000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Year Two TimeDepositMaturitiesYearTwo	102663000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Year Three TimeDepositMaturitiesYearThree	20688000	usd
CY2024Q3	us-gaap	Time Deposit Maturities Year Four TimeDepositMaturitiesYearFour	6919000	usd
CY2024Q3	fsbw	Time Deposit Maturities After Year Four TimeDepositMaturitiesAfterYearFour	411000	usd
CY2024Q3	us-gaap	Time Deposits TimeDeposits	1112221000	usd
CY2024Q3	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	580000	usd
CY2023Q3	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	643000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	1919000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Checking InterestExpenseDomesticDepositLiabilitiesChecking	1111000	usd
CY2024Q3	fsbw	Interest Expense Money Market Accounts And Savings Deposits InterestExpenseMoneyMarketAccountsAndSavingsDeposits	1981000	usd
CY2023Q3	fsbw	Interest Expense Money Market Accounts And Savings Deposits InterestExpenseMoneyMarketAccountsAndSavingsDeposits	1529000	usd
	fsbw	Interest Expense Money Market Accounts And Savings Deposits InterestExpenseMoneyMarketAccountsAndSavingsDeposits	5593000	usd
	fsbw	Interest Expense Money Market Accounts And Savings Deposits InterestExpenseMoneyMarketAccountsAndSavingsDeposits	4071000	usd
CY2024Q3	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	10925000	usd
CY2023Q3	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	8290000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	32108000	usd
	us-gaap	Interest Expense Domestic Deposit Liabilities Certificates Of Deposit InterestExpenseDomesticDepositLiabilitiesCertificatesOfDeposit	19514000	usd
CY2024Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	13486000	usd
CY2023Q3	us-gaap	Interest Expense Deposits InterestExpenseDeposits	10462000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	39620000	usd
	us-gaap	Interest Expense Deposits InterestExpenseDeposits	24696000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	10286000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	8953000	usd
	us-gaap	Net Income Loss NetIncomeLoss	27642000	usd
	us-gaap	Net Income Loss NetIncomeLoss	26281000	usd
CY2024Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	165000	usd
CY2023Q3	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	143000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	450000	usd
	us-gaap	Undistributed Earnings Loss Allocated To Participating Securities Basic UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic	423000	usd
CY2024Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	10121000	usd
CY2023Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	8810000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	27192000	usd
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	25858000	usd
CY2024Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7676102
CY2023Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7667981
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7689277
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	7643086
CY2024Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	178287
CY2023Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	112449
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	188569
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	125662
CY2024Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7854389
CY2023Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7780430
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7877846
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	7768748
CY2024Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.32
CY2023Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.54
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	3.38
CY2024Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.29
CY2023Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.13
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.45
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	3.33
CY2024Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0
CY2023Q3	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	64256
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	14151
	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	55174
CY2024Q3	us-gaap	Banking Regulation Capital Conservation Buffer Capital Conserved Minimum BankingRegulationCapitalConservationBufferCapitalConservedMinimum	0.025	pure
CY2024Q3	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.097	pure
CY2024Q3	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.112	pure
CY2024Q3	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.144	pure
CY2024Q3	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.112	pure
CY2023Q4	us-gaap	Tier One Leverage Capital To Average Assets TierOneLeverageCapitalToAverageAssets	0.09	pure
CY2023Q4	us-gaap	Tier One Risk Based Capital To Risk Weighted Assets TierOneRiskBasedCapitalToRiskWeightedAssets	0.105	pure
CY2023Q4	us-gaap	Capital To Risk Weighted Assets CapitalToRiskWeightedAssets	0.137	pure
CY2023Q4	us-gaap	Common Equity Tier One Capital Ratio CommonEquityTierOneCapitalRatio	0.105	pure
CY2024Q3	fsbw	Number Of Bank Branches NumberOfBankBranches	27	pure
CY2024Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	31244000	usd
CY2024Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	1513000	usd
CY2024Q3	us-gaap	Noninterest Income NoninterestIncome	5967000	usd
CY2024Q3	us-gaap	Noninterest Expense NoninterestExpense	25832000	usd
CY2024Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9866000	usd
CY2024Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-420000	usd
CY2024Q3	us-gaap	Net Income Loss NetIncomeLoss	10286000	usd
CY2024Q3	us-gaap	Assets Average Outstanding AssetsAverageOutstanding	2960790000	usd
CY2023Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	30634000	usd
CY2023Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	548000	usd
CY2023Q3	us-gaap	Noninterest Income NoninterestIncome	4982000	usd
CY2023Q3	us-gaap	Noninterest Expense NoninterestExpense	23586000	usd
CY2023Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	11482000	usd
CY2023Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	2529000	usd
CY2023Q3	us-gaap	Net Income Loss NetIncomeLoss	8953000	usd
CY2023Q3	us-gaap	Assets Average Outstanding AssetsAverageOutstanding	2901386000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	91991000	usd
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	3989000	usd
	us-gaap	Noninterest Income NoninterestIncome	16946000	usd
	us-gaap	Noninterest Expense NoninterestExpense	73218000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	31730000	usd
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	4088000	usd
	us-gaap	Net Income Loss NetIncomeLoss	27642000	usd
	us-gaap	Assets Average Outstanding AssetsAverageOutstanding	2955741000	usd
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	92848000	usd
	us-gaap	Noninterest Income NoninterestIncome	15034000	usd
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	33196000	usd
	us-gaap	Net Income Loss NetIncomeLoss	26281000	usd
	us-gaap	Assets Average Outstanding AssetsAverageOutstanding	2809509000	usd
CY2024Q3	us-gaap	Goodwill Goodwill	3600000	usd
	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	usd
CY2024Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	897000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2800000	usd
CY2023Q3	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	1000000	usd
	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	2500000	usd

Files In Submission

Name	View Source	Status
0001437749-24-034233-index-headers.html	Edgar Link	pending
0001437749-24-034233-index.html	Edgar Link	pending
0001437749-24-034233.txt	Edgar Link	pending
0001437749-24-034233-xbrl.zip	Edgar Link	pending
ex_713151.htm	Edgar Link	pending
ex_713152.htm	Edgar Link	pending
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ex_713154.htm	Edgar Link	pending
Financial_Report.xlsx	Edgar Link	pending
fsbw-20240930.xsd	Edgar Link	pending
fsbw20240930_10q.htm	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
R1.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
fsbw-20240930_cal.xml	Edgar Link	unprocessable
fsbw-20240930_lab.xml	Edgar Link	unprocessable
fsbw-20240930_def.xml	Edgar Link	unprocessable
fsbw-20240930_pre.xml	Edgar Link	unprocessable
fsbw20240930_10q_htm.xml	Edgar Link	completed
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$FSBW
FS Bancorp, Inc. Stock $fsbw

2024 Q4 Form 10-Q Financial Statement

#000143774924034233 Filed on November 08, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSBW FS Bancorp, Inc. Stock $fsbw

2024 Q4 Form 10-Q Financial Statement

#000143774924034233 Filed on November 08, 2024

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$FSBW
FS Bancorp, Inc. Stock $fsbw