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Loans - Loans HIP in past due status, non-performing status and accruing loans past-due 90 days or more by loan class (Parenthetical) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned Income $ 415,343 $ 355,908
Loans held-for-sale, at fair value 5,423 4,301
Loans held in portfolio 37,107,652 35,064,971
Non-accrual with no allowance 123,706 125,958
Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 3,800,000 3,500,000
FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 7,000,000 4,400,000
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 35,818,933 33,716,900
Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 31,000 38,000
Residential mortgage loans insured By FHA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance 65,000 106,000
Guarantees from FHA or VA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 207,000 242,000
Loans held in portfolio 2,600,000 2,200,000
Asset pledged as collateral    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 16,800,000 14,200,000
Asset pledged as collateral | Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 7,300,000 7,000,000
Asset pledged as collateral | FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio $ 9,500,000 $ 7,200,000