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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
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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- 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