v3.26.1
Loans - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income recognized $ 7,000 $ 3,000  
Loans held in portfolio, net of unearned income 39,289,702   $ 39,327,518
Non-accrual with no allowance 126,023   142,079
Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 282,827   337,423
Non-accrual with no allowance 126,000   142,000
Past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 1,308,293   1,431,641
Past due 90 days or more      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accruing loans past-due 90 days or more 226,387   228,960
Loans held in portfolio, net of unearned income 684,504   727,303
Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 8,712,361   8,649,440
Non-accrual with no allowance 60,697   60,034
Mortgages | Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 51,426   68,778
Mortgages | Past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 683,312   759,300
Mortgages | Past due 90 days or more      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accruing loans past-due 90 days or more 195,954   197,240
Loans held in portfolio, net of unearned income $ 335,021   $ 343,035