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Employee Benefits - Additional information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 05, 2025
Dec. 31, 2024
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 68,000 $ 63,000 $ 187,000 $ 176,000    
Deferred Compensation Liability Current and Noncurrent 2,629,000   2,629,000     $ 2,392,000
Salary Continuation Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Liability, Defined Benefit Plan $ 791,000   $ 791,000     827,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.00%   5.00%      
Annual benefit         $ 64,817,000  
Defined Contribution Plan, Cost $ 2,000 37,000 $ 6,000 110,000    
Deferred Directors Supplemental Retirement Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Pension Cost (Reversal of Cost) 18,000 $ 14,000 54,000 $ 44,000    
Liability, Defined Benefit Plan $ 634,000   $ 634,000     $ 611,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 6.25%   6.25%     6.25%
Defined Contribution Plan, Cost     $ 20,000      
Previous final base fee, percentage     70.00%      
Revised fixed annual retirement benefits, payable     $ 200,000      
Deferred Compensation Liability Current and Noncurrent $ 1,200,000   $ 1,200,000     $ 917,000