Quarterly report [Sections 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, 2026
Dec. 31, 2025
Loss Contingencies [Line Items]    
Total commitments $ 1,077,218 $ 1,098,954
Unused Commitments to Extend Credit    
Loss Contingencies [Line Items]    
Total commitments 891,594 930,122
Standby letters of credit    
Loss Contingencies [Line Items]    
Total commitments 177,459 163,071
Commercial letters of credit    
Loss Contingencies [Line Items]    
Total commitments $ 8,165 $ 5,761