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Organization and Nature of Business and Summary of Significant Accounting Policies (Trust assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Trust assets | $ 677,586 | $ 640,069

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Assets held by the Company in fiduciary capacity and are not included in the reported assets of the Company. + References No definition available. + Details
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Namespace Prefix: | wtba_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant