v3.26.3
Commitments and Contingent Liabilities - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2026
Dec. 31, 2025
Loss Contingencies [Line Items]    
Loan commitments outstanding $ 7,205,243 $ 6,408,827
Loan commitments expiry period 1 year  
Commercial Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Letters of credit issued $ 125 2,762
Standby Letters of Credit [Member]    
Loss Contingencies [Line Items]    
Letters of credit issued $ 176,933 $ 166,885