Commitments and Contingencies - Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Standby Letters of Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Financial instruments with off- balance-sheet risk | $ 407,107 | $ 394,714 |
| Deferred Standby Letter Of Credit Fees [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Financial instruments with off- balance-sheet risk | 2,642 | 2,740 |
| Commitments to Extend Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Financial instruments with off- balance-sheet risk | $ 12,588,863 | $ 12,473,653 |