Quarterly report pursuant to Section 13 or 15(d)

Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail)

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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