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Employee Benefits - Additional information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Mar. 05, 2025
Dec. 31, 2024
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 59,000 $ 53,000 $ 118,000 $ 113,000    
Deferred Compensation Liability Current and Noncurrent 2,562,000   2,562,000     $ 2,392,000
Salary Continuation Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Liability, Defined Benefit Plan $ 803,000   $ 803,000     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 36,000 $ 4,000 73,000    
Deferred Directors Supplemental Retirement Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Pension Cost (Reversal of Cost) 18,000 $ 15,000 36,000 $ 30,000    
Liability, Defined Benefit Plan $ 616,000   $ 616,000     $ 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 $ 1,100,000   $ 1,100,000     $ 917,000