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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Basic        
Net income $ 7,701 $ 9,164 $ 16,167 $ 19,922
Less allocation of earnings and dividends to participating securities 39 42 71 76
Net income available to common shareholders—basic $ 7,662 $ 9,122 $ 16,096 $ 19,846
Weighted average common shares outstanding 14,615,154 15,602,329 14,761,363 15,734,226
Less average participating securities 74,286 72,563 65,146 59,995
Weighted average number of shares outstanding used in the calculation of basic earnings per common share 14,540,868 15,529,766 14,696,217 15,674,231
Earnings per common share:        
Basic $ 0.53 $ 0.59 $ 1.10 $ 1.27
Diluted $ 0.53 $ 0.59 $ 1.10 $ 1.27