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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 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Basic                      
Net income $ 3,981 $ 3,660 $ 3,596 $ 4,635 $ 3,631 $ 3,680 $ 5,181 $ 4,725 $ 15,872 $ 17,217 $ 12,745
Preferred stock dividends                 1,244 1,501 1,577
Net income available to common shareholders                 $ 14,628 $ 15,716 $ 11,168
Weighted average common shares outstanding for earnings per common share basic                 9,906,856 8,010,399 7,822,369
Basic earnings per share $ 0.36 $ 0.33 $ 0.32 $ 0.47 $ 0.39 $ 0.41 $ 0.61 $ 0.55 $ 1.48 $ 1.96 $ 1.43
Diluted                      
Net income available to common shareholders—basic                 $ 14,628 $ 15,716 $ 11,168
Preferred stock dividends on convertible preferred stock                 1,244 1,501 1,577
Net income available to common shareholders—diluted                 $ 15,872 $ 17,217 $ 12,745
Weighted average common shares outstanding for earnings per common share basic                 9,906,856 8,010,399 7,822,369
Add: dilutive effects of convertible preferred shares                 2,445,760 2,940,562 3,095,966
Average shares and dilutive potential common shares outstanding—diluted                 12,352,616 10,950,961 10,918,335
Diluted earnings per share $ 0.30 $ 0.29 $ 0.29 $ 0.40 $ 0.33 $ 0.34 $ 0.47 $ 0.43 $ 1.28 $ 1.57 $ 1.17