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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
May 15, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares allocated for issuance to directors, officers and key personnel 4,900,000   4,900,000      
Number of Options, Granted 0   400,000 270,000    
Stock-based compensation expense $ 752,000 $ 757,000 $ 1,278,000 $ 1,378,000    
Strike price | $ / shares     $ 18.41 $ 17.65    
Restricted shares granted 2,675   13,979 11,955    
Fair value estimation     The fair value of the six-month “look-back” option in the Company’s Employee Stock Purchase Plan is estimated by adding the fair value of 15% of one share of stock to 85% of the fair value of an option on one share of stock.      
Stock Options And Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock issued during period share-based compensation 46,765 30,239 158,932 30,239    
Employee Stock Purchase Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grants 500,589   500,589     600,000
Stock-based compensation expense $ 30,000 $ 81,000 $ 70,000 $ 81,000    
Price per share $ 12.63 $ 12.71 $ 12.63 $ 12.71    
Percentage of maximum contribution of salary towards plan 15.00%   15.00%      
Maximum contribution towards plan $ 25,000   $ 25,000      
Discount on purchase of common stock     15.00%      
Stock issued during period share-based compensation 15,765 14,301 15,765 14,301    
Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares available for future grants 344,075 0 344,075 0 538,000