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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 898,078 | $ 930,825
Commitments to extend credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 782,291 | 813,960
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 97,463 | 83,725
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 18,324 | $ 33,140

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