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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