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Note 4 - Mortgage Servicing Rights (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Unpaid Principal Balance of Loans Serviced for Others | $ 118,300,000 |  |  | $ 118,300,000 |  | $ 83,400,000
Servicing Asset at Amortized Cost, Fair Value | 1,300,000 |  |  | 1,300,000 |  | $ 807,000
Proceeds from Sale of Mortgage Servicing Rights (MSR) | $ 0 | $ 0 | $ 0 | $ 0 | $ 2,110,000 |
Mortgage Servicing Rights, Underlying Financing Receivable |  | 233,000,000 |  |  | 233,000,000 |
Mortgage Servicing Rights, Underlying Financing Receivable, Book Value |  | $ 2,000,000 |  |  | 2,000,000 |
Gain (Loss) on Sale of Mortgage Servicing Rights |  |  |  |  | $ 152,000 |

X
- Definition The cash inflow from the sale of servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-3 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 50 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481229/860-50-50-4 + Details
Name: | us-gaap_ServicingAssetAtAmortizedValueFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The gain (loss) on sale of mortgage service rights. + References No definition available. + Details
Name: | wsbf_GainLossOnSaleOfMortgageServicingRights
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The value of financing receivable underlying mortgage servicing rights. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsUnderlyingFinancingReceivable
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The book value of fiancing receivable underlyiing mortgage servicing rights. + References No definition available. + Details
Name: | wsbf_MortgageServicingRightsUnderlyingFinancingReceivableBookValue
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The unpaid principal balance of loans serviced for others. + References No definition available. + Details
Name: | wsbf_UnpaidPrincipalBalanceOfLoansServicedForOthers
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant