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Loans - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Interest income recognized $ 3,000,000 $ 3,000,000  
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 1,761,000 2,250,000  
Loans held in portfolio, net of unearned income 37,254,032,000   $ 37,107,652,000
Non-accrual with no allowance 110,187,000   123,706,000
Trading account debt securities      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 1,718,000 2,205,000  
Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 287,563,000   313,220,000
Non-accrual with no allowance 110,000,000   124,000,000
Past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 1,140,878,000   1,288,719,000
Past due 90 days or more      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accruing loans past-due 90 days or more 219,860,000   242,440,000
Loans held in portfolio, net of unearned income 533,929,000   593,220,000
GNMA | Trading account debt securities      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 0 1,100,000  
FNMA | Trading account debt securities      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds 1,718,000 $ 1,105,000  
Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 8,273,753,000   8,114,183,000
Non-accrual with no allowance 66,048,000   67,245,000
Mortgages | Collateral Pledged      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 66,021,000   79,340,000
Mortgages | Past due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held in portfolio, net of unearned income 749,070,000   798,130,000
Mortgages | Past due 90 days or more      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accruing loans past-due 90 days or more 185,051,000   207,317,000
Loans held in portfolio, net of unearned income 362,644,000   395,649,000
Mortgages | GNMA | Buy Back Option Program | Past due 90 days or more      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Accruing loans past-due 90 days or more $ 7,000,000   $ 9,000,000