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Note 11 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2025	Jun. 30, 2024
Fair Value, Transfers into (out of) Levels 1, 2 and 3, Amount	$ 0	$ 0

X

- Definition

Amount of transfers between levels 1, 2 and 3 during the period.

+ References

No definition available.

+ Details

Name:	wsbf_FairValueTransfersIntoOutOfLevels12And3Amount
Namespace Prefix:	wsbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant