Derivatives Pre-Tax Gains (Losses) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
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| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Pre-tax gain (loss) recognized in other comprehensive income | $ 1,454 | $ (1,021) | $ 3,508 | $ (3,335) |
| Reclassification from AOCI into income, decrease in interest expense | 348 | 1,412 | 958 | 2,816 |
| Designated as Hedging Instrument [Member] | Interest rate derivative | Cash Flow Hedging [Member] | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Pre-tax gain (loss) recognized in other comprehensive income | 1,454 | (1,021) | 3,508 | (3,335) |
| Designated as Hedging Instrument [Member] | Interest rate derivative | Cash Flow Hedging [Member] | Income Statement Location [Axis]: wtba:UsGaapInterestExpenseMember | ||||
| Derivative Instruments, Gain (Loss) [Line Items] | ||||
| Reclassification from AOCI into income, decrease in interest expense | $ (348) | $ (1,412) | $ (958) | $ (2,816) |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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