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Off-Balance Sheet Commitments - Distribution of Total Loan Commitments (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total commitments | $ 945,791 | $ 872,317
Unused Commitments to Extend Credit |  |
Loss Contingencies [Line Items] |  |
Total commitments | 848,886 | 780,543
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total commitments | 77,381 | 71,829
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total commitments | $ 19,524 | $ 19,945

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