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Note 11 - Fair Value Measurements - Assets Recorded at Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Real estate owned	$ 85	$ 505
Impaired MSR	4
Fair Value, Inputs, Level 1 [Member]
Real estate owned	0	0
Impaired MSR	0
Fair Value, Inputs, Level 2 [Member]
Real estate owned	0	0
Impaired MSR	0
Fair Value, Inputs, Level 3 [Member]
Real estate owned	85	$ 505
Impaired MSR	$ 4

X

- Definition

The fair value of impaired mortgage servicing rights.

+ References

No definition available.

+ Details

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Namespace Prefix:	wsbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents fair value disclosure of real estate owned.

+ References

No definition available.

+ Details

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Namespace Prefix:	wsbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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- Details

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- Details

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- Details

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