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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2023
Jan. 01, 2023
Dec. 31, 2022
Other Commitments [Line Items]        
Outstanding loan commitments $ 590,100 $ 590,100   $ 736,100
Outstanding stand-by letters of credit 23,300 23,300   29,800
Reserve for unfunded commitments 4,000 4,000 $ 3,700 1,812
Credit losses for unfunded commitments 550 1,600    
Future commitments outstanding related to investments $ 16,600 $ 16,600    
Other Liabilities [Member]        
Other Commitments [Line Items]        
Reserve for unfunded commitments       $ 1,800