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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jul. 01, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Non-cash equity compensation   $ 511 $ 199 $ 848 $ 331  
Restricted stock awards outstanding   237,785   237,785   173,484
Unrecognized compensation expense       $ 3,100    
Share-based compensation arrangement by share-based payment award, converted options to purchase common stock 198,362          
Share-based compensation arrangement by share-based payment award options to acquire common stock 99,176          
Options to acquire shares of common stock on post stock split basis 148,764          
Estimated fair value $ 472          
Stock option exercises, Shares       83,647    
Stock Option Forfeited       380    
Stock options outstanding   64,737   64,737    
Bay Banks [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Options to acquire shares of common stock on post stock split basis 148,764          
Weighted-average exercise price per stock option $ 14.83          
Remaining contractual life (in years) 5 years 5 months 19 days          
Post Stock Split basis [Member] | Bay Banks [Member]            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Weighted-average exercise price per stock option $ 9.89