v3.26.1
Employee Benefits - Additional information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Mar. 05, 2025
Defined Benefit Plan Disclosure [Line Items]            
Defined Benefit Plan, Plan Assets, Contributions by Employer $ 72,000 $ 59,000 $ 142,000 $ 118,000    
Deferred Compensation Liability Current and Noncurrent 2,833,000   2,833,000   $ 2,667,000  
Salary Continuation Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Annual benefit           $ 64,817
Liability, Defined Benefit Plan $ 749,000   $ 749,000   779,000  
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 5.00%   5.00%      
Defined Contribution Plan, Cost $ 1,000 2,000 $ 2,000 4,000    
Deferred Directors Supplemental Retirement Plan [Member] | Supplemental Employee Retirement Plan [Member]            
Defined Benefit Plan Disclosure [Line Items]            
Pension Cost (Reversal of Cost) 19,000 $ 18,000 29,000 $ 36,000    
Liability, Defined Benefit Plan $ 631,000   $ 631,000   $ 652,000  
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 $ 1,400,000   $ 1,400,000   $ 1,200,000