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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Other Commitments [Line Items]      
Outstanding loan commitments $ 320,300 $ 320,300 $ 480,800
Cancellable amounts 106,300 106,300 113,500
Outstanding stand-by letters of credit 11,900 11,900 12,600
Credit losses for unfunded commitments 200 1,700  
Future commitments outstanding related to investments 7,600 7,600  
Mortgage Servicing Rights Assets [Member]      
Other Commitments [Line Items]      
Recourse reserve 520 520  
Other Liabilities [Member]      
Other Commitments [Line Items]      
Reserves for unfunded commitments to borrowers $ 1,400 $ 1,400 $ 3,100