Annual report pursuant to Section 13 and 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
Dec. 31, 2022
Dec. 31, 2021
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 872,317 $ 715,022
Commitments to extend credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 780,543 626,474
Standby letters of credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 71,829 49,287
Commercial letters of credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 19,945 $ 39,261