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Off-Balance Sheet Commitments - Distribution of Total Loan Commitments (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total commitments | $ 854,221 | $ 930,825
Unused Commitments to Extend Credit |  |
Loss Contingencies [Line Items] |  |
Total commitments | 739,975 | 813,960
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total commitments | 95,657 | 83,725
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total commitments | $ 18,589 | $ 33,140

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