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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Basic        
Net income $ 8,661 $ 3,014 $ 18,330 $ 10,003
Preferred stock dividends 164 299 328 602
Net income available to common shareholders $ 8,497 $ 2,715 $ 18,002 $ 9,401
Weighted average common shares outstanding for basic earnings per common share 15,628,537 10,470,839 15,618,154 10,342,763
Basic earnings per common share $ 0.54 $ 0.26 $ 1.15 $ 0.91
Diluted        
Net income available to common shareholders—basic $ 8,497 $ 2,715 $ 18,002 $ 9,401
Preferred stock dividends 164 299 328 602
Net income available to common shareholders—diluted $ 8,661 $ 3,014 $ 18,330 $ 10,003
Weighted average common shares outstanding for basic earnings per common share 15,628,537 10,470,839 15,618,154 10,342,763
Add: Dilutive effects of convertible preferred shares 1,294,175 2,144,497 1,294,175 2,263,652
Average shares and dilutive potential common shares outstanding—diluted 16,922,712 12,615,336 16,912,329 12,606,415
Diluted earnings per common share $ 0.51 $ 0.24 $ 1.08 $ 0.79