XML 50 R35.htm IDEA: XBRL DOCUMENT
v3.25.4

Deposits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2025
Deposits [Abstract] |
Schedule of Maturities of Time Deposits [Table Text Block] | The scheduled maturities of time deposits were as follows as of December 31, 2025.
2026 | $ | 505,602 |
2027 | 2,496 |
2028 | 1,713 |
2029 | 603 |
2030 | 376 |
| $ | 510,790 |

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

X
- Definition Tabular disclosure of the maturities of time deposits. + References No definition available. + Details
Name: | wtba_ScheduleOfMaturitiesOfTimeDepositsTableTextBlock
Namespace Prefix: | wtba_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration