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Note 4 - Mortgage Servicing Rights - Future Amortization Expenses (Details) $ in Thousands | Sep. 30, 2025 USD ($)
--- | ---
2025 | $ 43
2026 | 189
2027 | 170
2028 | 151
2029 | 132
Thereafter | 354
Total | $ 1,039

X
- Definition Value of mortgage servicing rights. + References No definition available. + Details
Name: | wsbf_MortgageServicingRights
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for mortgage servicing rights expected to be recognized during after fifth fiscal year following current fiscal year. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsFutureAmortizationExpensesThereafter
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for mortgage servicing rights expected to be recognized during fifth fiscal year following current fiscal year. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsFutureAmortizationExpensesYearFive
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for mortgage servicing rights expected to be recognized during fourth fiscal year following current fiscal year. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsFutureAmortizationExpensesYearFour
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for mortgage servicing rights expected to be recognized during next fiscal year following current fiscal year. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsFutureAmortizationExpensesYearOne
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for mortgage servicing rights expected to be recognized during third fiscal year following current fiscal year. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsFutureAmortizationExpensesYearThree
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of amortization for mortgage servicing rights expected to be recognized during second fiscal year following current fiscal year. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsFutureAmortizationExpensesYearTwo
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant