v3.25.1
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
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned Income $ 421,038 $ 415,343
Loans held-for-sale, at fair value 5,077 5,423
Loans held in portfolio 37,254,032 37,107,652
Non-accrual with no allowance 110,187 123,706
Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 4,100,000 3,800,000
FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 7,200,000 7,000,000
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 36,113,154 35,818,933
Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 30,000 31,000
Residential mortgage loans insured By FHA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance 57,000 65,000
Guarantees from FHA or VA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accruing loans past-due 90 days or more 185,000 207,000
Loans held in portfolio 2,800,000 2,600,000
Asset pledged as collateral    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 16,300,000 16,800,000
Asset pledged as collateral | Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio 7,300,000 7,300,000
Asset pledged as collateral | FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans held in portfolio $ 9,000,000 $ 9,500,000