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

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- Definition Represents fair value disclosure of real estate owned. + References No definition available. + Details
Name: | wsbf_RealEstateOwnedFairValueDisclosure
Namespace Prefix: | wsbf_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsNonrecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |