XML 61 R46.htm IDEA: XBRL DOCUMENT v3.25.4

Organization and Nature of Business and Summary of Significant Accounting Policies (FHLB stock) (Details)	Dec. 31, 2025 USD ($)
Investments, All Other Investments [Abstract]
Federal Home Loan Bank stock quoted value	$ 0

X

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsAllOtherInvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Federal Home Loan Bank stock quoted value

+ References

No definition available.

+ Details

Name:	wtba_FederalHomeLoanBankStockQuotedValue
Namespace Prefix:	wtba_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant