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Note 4 - Mortgage Servicing Rights (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Unpaid Principal Balance of Loans Serviced for Others	$ 107,300,000		$ 107,300,000		$ 83,400,000
Servicing Asset at Amortized Cost, Fair Value	1,200,000		1,200,000		$ 807,000
Proceeds from Sale of Mortgage Servicing Rights (MSR)	$ 0	$ 2,100,000	$ 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

Name:	us-gaap_ProceedsFromSaleOfMortgageServicingRightsMSR
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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