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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 930,825 | $ 872,317
Commitments to extend credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 813,960 | 780,543
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 83,725 | 71,829
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 33,140 | $ 19,945

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