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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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic                      
Net income $ 3,631 $ 3,680 $ 5,181 $ 4,725 $ 3,199 $ 3,253 $ 3,122 $ 3,171 $ 17,217 $ 12,745 $ 9,528
Preferred stock dividends                 1,501 1,577 1,873
Net income available to common shareholders-basic                 $ 15,716 $ 11,168 $ 7,655
Weighted average common shares outstanding-basic                 8,010,399 7,822,369 7,707,917
Basic earnings per share $ 0.39 $ 0.41 $ 0.61 $ 0.55 $ 0.36 $ 0.36 $ 0.35 $ 0.36 $ 1.96 $ 1.43 $ 0.99
Diluted                      
Net income available to common shareholders-basic                 $ 15,716 $ 11,168 $ 7,655
Preferred stock dividends on convertible preferred stock                 1,501 1,577 1,606
Net income available to common shareholders-diluted                 $ 17,217 $ 12,745 $ 9,261
Weighted average common shares outstanding for earnings per common share basic                 8,010,399 7,822,369 7,707,917
Add: dilutive effects of convertible preferred shares                 2,940,562 3,095,966 3,196,931
Average shares and dilutive potential common shares outstanding-diluted                 10,950,961 10,918,335 10,904,848
Diluted earnings per share $ 0.33 $ 0.34 $ 0.47 $ 0.43 $ 0.29 $ 0.30 $ 0.29 $ 0.29 $ 1.57 $ 1.17 $ 0.85