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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
Jun. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned Income $ 426,656 $ 415,343
Loans held-for-sale, at fair value 2,898 5,423
Loans held in portfolio 38,185,178 37,107,652
Non-accrual with no allowance 109,011 123,706
Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 4,000,000 3,800,000
FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 10,800,000 7,000,000
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 37,022,911 35,818,933
Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 29,000 31,000
Residential mortgage loans insured By FHA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance 52,000 65,000
Guarantees from FHA or VA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 177,000 207,000
Loans held in portfolio 2,900,000 2,600,000
Asset pledged as collateral    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 21,400,000 16,800,000
Asset pledged as collateral | Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 7,500,000 7,300,000
Asset pledged as collateral | FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio $ 13,900,000 $ 9,500,000