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Other Assets and Liabilities - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
loan
Sep. 30, 2025
USD ($)
security_loan
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
loan
Dec. 31, 2024
USD ($)
security_loan
Financing Receivable, Allowance for Credit Loss [Line Items]                
Current expected credit loss reserves for unfunded loan commitments $ 13,741 $ 8,300 $ 13,741 $ 13,741 $ 13,741 $ 8,300 $ 10,412 $ 10,412
Number of loans     137 137     130 130
Increase (decrease) in reserve 2,000 $ (1,600)     3,300 $ (7,100)    
Unfunded Loan Commitments                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Current expected credit loss reserves for unfunded loan commitments $ 1,532,429   $ 1,532,429 $ 1,532,429 $ 1,532,429   $ 1,263,068 $ 1,263,068
Number of loans | loan     57