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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Other Commitments [Line Items]    
Outstanding loan commitments $ 283,200 $ 480,800
Cancellable amounts 108,400 113,500
Outstanding stand-by letters of credit 12,500 12,600
Credit losses for unfunded commitments 2,200 2,400
Future commitments outstanding related to investments 7,100  
Mortgage Servicing Rights Assets [Member]    
Other Commitments [Line Items]    
Recourse reserve 1,800  
Other Liabilities [Member]    
Other Commitments [Line Items]    
Reserves for unfunded commitments to borrowers $ 924 $ 3,100