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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, 2020
Mar. 31, 2019
Basic    
Net income $ 7,833 $ 9,669
Preferred stock dividends   164
Net income available to common shareholders $ 7,833 $ 9,505
Weighted average common shares outstanding for basic earnings per common share 16,517,745 15,607,655
Basic earnings per common share $ 0.47 $ 0.61
Diluted    
Net income available to common shareholders—basic $ 7,833 $ 9,505
Preferred stock dividends   164
Net income available to common shareholders—diluted $ 7,833 $ 9,669
Weighted average common shares outstanding for basic earnings per common share 16,517,745 15,607,655
Add: Dilutive effects of convertible preferred shares   1,294,175
Average shares and dilutive potential common shares outstanding—diluted 16,517,745 16,901,830
Diluted earnings per common share $ 0.47 $ 0.57