XML 79 R64.htm IDEA: XBRL DOCUMENT
v3.25.4

Loans and Allowance for Credit Losses Schedule of Troubled Debt Restructured Loan Modifications (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 USD ($) loans | Dec. 31, 2024 USD ($) loans | Dec. 31, 2023 loans
Loans and Allowance for Credit Losses [Abstract] |  |  |
Loan restructurings made to borrowers experiencing financial difficulty | $ | $ 0 | $ 0 |
Loans and leases receivable, modified, subsequent default, number of contracts | loans | 0 | 0 | 0

X
- Definition Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-33 Reference 3: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481746/310-40-50-4 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Note 7. Impaired Loans and Allowance for Credit Losses [Abstract] + References No definition available. + Details
Name: | wtba_LoansAndAllowanceForCreditLossesAbstract
Namespace Prefix: | wtba_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of loan receivable contracts with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty. + References No definition available. + Details
Name: | wtba_LoansAndLeasesReceivableModifiedSubsequentDefaultNumberOfContracts
Namespace Prefix: | wtba_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration