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v3.25.3

Note 11 - Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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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