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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
Mar. 31, 2021
Mar. 31, 2020
Basic    
Net income $ 10,758 $ 7,833
Net income available to common shareholders—basic $ 10,758 $ 7,833
Weighted average common shares outstanding—basic 15,867,588 16,517,745
Basic earnings per common share $ 0.68 $ 0.47
Diluted    
Net income available to common shareholders—basic $ 10,758 $ 7,833
Net income available to common shareholders—diluted $ 10,758 $ 7,833
Weighted average common shares outstanding—basic 15,867,588 16,517,745
Diluted earnings per common share $ 0.68 $ 0.47