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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, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned Income $ 386,982 $ 355,908
Loans held-for-sale, at fair value 8,225 4,301
Notes Receivable Gross 35,591,620 35,064,971
Non-accrual with no allowance 143,825 125,958
Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 3,900,000 3,500,000
FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 4,700,000 4,400,000
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 34,326,427 33,716,900
Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 34,000 38,000
Residential mortgage loans insured By FHA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance 81,000 106,000
Asset pledged as collateral    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 13,600,000 14,200,000
Asset pledged as collateral | Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 7,200,000 7,000,000
Asset pledged as collateral | FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross $ 6,400,000 $ 7,200,000