Commitments, Contingencies and Off-Balance-Sheet Risk - Contractual Amounts of Financial Instruments with Off-Balance-Sheet Risk (Detail) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Fixed Rate | $ 38,966 | $ 34,606 |
| Variable Rate | 714,832 | 704,768 |
| Lines of Credit and Construction Loans [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Fixed Rate | 38,940 | 34,580 |
| Variable Rate | 669,101 | 652,725 |
| Overdraft Protection [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Fixed Rate | 10 | 10 |
| Variable Rate | 45,654 | 51,961 |
| Letters of Credit [Member] | ||
| Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] | ||
| Fixed Rate | 16 | 16 |
| Variable Rate | $ 77 | $ 82 |