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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, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unearned Income $ 355,908 $ 295,156
Loans held-for-sale, at fair value 4,301 5,381
Notes Receivable Gross 35,064,971 32,077,769
Non-accrual with no allowance 125,958 177,104
Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 3,500,000 2,100,000
FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Line Of Credit Facility Current Borrowing Capacity 4,400,000 1,400,000
Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 33,716,900 30,783,152
Reverse Mortgages | Current    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 38,000 42,000
Residential mortgage loans insured By FHA    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-accrual with no allowance 106,000 190,000
Asset pledged as collateral    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 14,200,000 7,400,000
Asset pledged as collateral | Federal Home Loan Bank    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross 7,000,000 4,800,000
Asset pledged as collateral | FRB Advances    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes Receivable Gross $ 7,200,000 $ 2,600,000