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Allowance for Credit Losses - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
Loan
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Loan
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Accounts Notes And Loans Receivable [Line Items]          
Provision for credit losses $ 378,000 $ 1,346,000 $ 2,797,000 $ 5,188,000  
Allowance for credit losses 378,000 1,346,000 2,797,000 5,188,000  
Decrease of provisions in net loans     $ 14,200,000 178,200,000  
Number of days reaching where loans are considered for nonaccrual status     90 days    
Conditions where loans are considered for nonaccrual status     A loan may be returned to accruing status only if one of two conditions are met: (1) the loan is well-secured and none of the principal and interest has been past due for a minimum of 90 days or (2) the principal and interest payments are reasonably assured and a sustained period of performance has occurred, generally six months.    
Loans modified as troubled debt restructuring 0 $ 0 $ 0 $ 0  
Individually evaluated loans     greater than $350    
Residential mortgages in process of foreclosure $ 1,263,000   $ 1,263,000   $ 669,000
Number of loan modified | Loan 1   2