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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 645,389 | $ 555,616
Commitments to extend credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 536,149 | 453,900
Standby letters of credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 49,006 | 47,169
Commercial letters of credit |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 60,234 | $ 54,547

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- Details
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- Details
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- Details
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