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Note 11 - Debt - Summary of Advances From Federal Home Loan Bank (Details) $ in Thousands | Dec. 31, 2024 USD ($)
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2025, balances | $ 259,000
2025, interest rates | 4.60%
2026, balances | $ 48,806
2026, interest rates | 4.79%
Total, balances | $ 307,806
Total, interest rates | 4.63%

X
- Definition Weighted average interest rate of advance. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | fsbw_DebtMaturityInterestRate
Namespace Prefix: | fsbw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | fsbw_DebtMaturityTotal
Namespace Prefix: | fsbw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | fsbw_DebtMaturityYearOne
Namespace Prefix: | fsbw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of advance due in fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | fsbw_DebtMaturityYearOneInterestRate
Namespace Prefix: | fsbw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of debt payable, sinking fund requirement, and other securities issued that are redeemable by holder at fixed or determinable price and date, maturing in year two following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | fsbw_DebtMaturityYearTwo
Namespace Prefix: | fsbw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Weighted average interest rate of advance due in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References No definition available. + Details
Name: | fsbw_DebtMaturityYearTwoInterestRate
Namespace Prefix: | fsbw_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant