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Earnings per Common Share - Computation of Basic and Diluted Earnings per Common Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Basic        
Net income $ 11,112 $ 9,642 $ 27,279 $ 29,564
Less allocation of earnings and dividends to participating securities 52 46 123 122
Net income available to common shareholders—basic $ 11,060 $ 9,596 $ 27,156 $ 29,442
Weighted average common shares outstanding 15,394,898 15,168,233 14,974,862 15,543,488
Less average participating securities 71,604 72,071 67,323 64,064
Weighted average number of shares outstanding used in the calculation of basic earnings per common share 15,323,294 15,096,162 14,907,539 15,479,424
Earnings per common share:        
Basic $ 0.72 $ 0.64 $ 1.82 $ 1.90
Diluted $ 0.72 $ 0.64 $ 1.82 $ 1.90