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Commitments and Letters of Credit - Notional Amount of Commitments and Letter of Credit Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Commitments to extend credit    
Loss Contingencies [Line Items]    
Financial instrument of credit risk $ 2,517,905 $ 2,356,539
Financial standby letters of credit    
Loss Contingencies [Line Items]    
Financial instrument of credit risk 14,300 18,417
Performance standby letters of credit    
Loss Contingencies [Line Items]    
Financial instrument of credit risk 17,194 12,853
Commercial letters of credit    
Loss Contingencies [Line Items]    
Financial instrument of credit risk $ 555 $ 573