Quarterly report pursuant to Section 13 or 15(d)

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

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Off-Balance Sheet Commitments - Distribution of Total Loan Commitments (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Loss Contingencies [Line Items]    
Total commitments $ 719,901 $ 715,022
Unusued commitments to extend credit    
Loss Contingencies [Line Items]    
Total commitments 626,615 626,474
Standby letters of credit    
Loss Contingencies [Line Items]    
Total commitments 46,669 49,287
Commercial letters of credit    
Loss Contingencies [Line Items]    
Total commitments $ 46,617 $ 39,261