Annual report [Section 13 and 15(d), not S-K Item 405]

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, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 1,098,954 $ 898,078
Commitments to extend credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 930,122 782,291
Standby letters of credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments 163,071 97,463
Commercial letters of credit    
Loss Contingencies [Line Items]    
Total undisbursed loan commitments $ 5,761 $ 18,324