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Loans - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Interest income recognized     $ 3,000 $ 2,000  
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds $ 5,226 $ 2,673 6,987 4,923  
Loans held in portfolio, net of unearned income 38,185,178   38,185,178   $ 37,107,652
Non-accrual with no allowance 109,011   109,011   123,706
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 5,134 2,601 6,852 4,806  
Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held in portfolio, net of unearned income 350,193   350,193   313,220
Non-accrual with no allowance 109,000   109,000   124,000
Past due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held in portfolio, net of unearned income 1,162,267   1,162,267   1,288,719
Past due 90 days or more          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accruing loans past-due 90 days or more 206,394   206,394   242,440
Loans held in portfolio, net of unearned income 518,019   518,019   593,220
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 2,581 0 2,581 1,100  
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 2,553 $ 2,601 4,271 $ 3,706  
Mortgages          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held in portfolio, net of unearned income 8,444,427   8,444,427   8,114,183
Non-accrual with no allowance 64,369   64,369   67,245
Mortgages | Collateral Pledged          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held in portfolio, net of unearned income 72,642   72,642   79,340
Mortgages | Past due          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans held in portfolio, net of unearned income 728,253   728,253   798,130
Mortgages | Past due 90 days or more          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accruing loans past-due 90 days or more 176,676   176,676   207,317
Loans held in portfolio, net of unearned income 352,192   352,192   395,649
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 $ 8,000   $ 8,000   $ 9,000