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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic        
Net income (loss) $ (3,433) $ 3,660 $ 6,570 $ 11,892
Preferred stock dividends 192 308 794 935
Net income (loss) available to common shareholders $ (3,625) $ 3,352 $ 5,776 $ 10,957
Weighted average common shares outstanding for basic earnings per common share 11,627,093 10,170,734 10,775,577 9,815,118
Basic earnings (loss) per common share $ (0.31) $ 0.33 $ 0.54 $ 1.12
Diluted        
Net income (loss) available to common shareholders—basic $ (3,625) $ 3,352 $ 5,776 $ 10,957
Preferred stock dividends 192 308 794 935
Net income (loss) available to common shareholders—diluted $ (3,433) $ 3,660 $ 6,570 $ 11,892
Weighted average common shares outstanding for basic earnings per common share 11,627,093 10,170,734 10,775,577 9,815,118
Add: Dilutive effects of convertible preferred shares 1,643,980 2,426,565 2,054,825 2,455,008
Average shares and dilutive potential common shares outstanding—diluted 13,271,073 12,597,299 12,830,402 12,270,126
Diluted earnings (loss) per common share $ (0.31) $ 0.29 $ 0.51 $ 0.97