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Other Assets and Liabilities - Additional Information (Detail)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
loan
Sep. 30, 2024
USD ($)
security_loan
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2023
USD ($)
security_loan
Financing Receivable, Allowance for Credit Loss [Line Items]                
Current expected credit loss reserves for unfunded loan commitments $ 8,307 $ 13,600 $ 8,307 $ 8,307 $ 8,307 $ 13,600 $ 15,371 $ 15,371
Number of loans     149 149     178 178
Increase (decrease) in reserve (1,600) $ 2,600     (7,100) $ (2,800)    
Unfunded Loan Commitments                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Current expected credit loss reserves for unfunded loan commitments $ 1,562,589   $ 1,562,589 $ 1,562,589 $ 1,562,589   $ 2,430,664 $ 2,430,664
Number of loans | loan     76