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Loans Held-for-Investment and Allowance for Credit Losses - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Nonaccrual, past due 90 days or more and still accruing, restructured loans and foreclosed assets $ 58,542,000 $ 64,417,000 $ 58,542,000 $ 64,417,000 $ 63,096,000
Additional funds advanced in connection with impaired loans 0   0    
Loans held by subsidiaries subject to blanket liens 7,391,570,000   7,391,570,000    
Reserve for unfunded commitments (Other liabilities) 8,842,000 8,004,000 8,842,000 8,004,000 $ 8,677,000
Provision for loan losses 25,506,000 5,552,000 30,929,000 12,718,000  
Unfunded Loan Commitment [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Provision for loan losses 24,435,000 6,123,000 31,095,000 12,817,000  
Reversal of Provision for credit losses $ 1,072,000 $ 571,000 $ 165,000 $ 101,000