Off-Balance-Sheet Arrangements, Commitments, Guarantees and Contingencies (Financial Instruments With Off-Balance-Sheet Risk) (Detail) - USD ($) $ in Thousands |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Standby Letters of Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Financial instruments with off- balance-sheet risk | $ 383,851 | $ 238,690 |
| Deferred Standby Letter of Credit Fees [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Financial instruments with off- balance-sheet risk | 2,236 | 2,072 |
| Commitments to Extend Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Financial instruments with off- balance-sheet risk | $ 12,137,957 | $ 10,420,142 |