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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic        
Net income $ 3,253 $ 2,306 $ 9,546 $ 7,257
Preferred stock dividends 391 406 1,186 1,467
Net income available to common shareholders - basic $ 2,862 $ 1,900 $ 8,360 $ 5,790
Weighted average common shares outstanding - basic 7,843,578 7,707,917 7,815,222 7,707,917
Basic earnings per common share $ 0.36 $ 0.25 $ 1.07 $ 0.75
Diluted        
Net income available to common shareholders - basic $ 2,862 $ 1,900 $ 8,360 $ 5,790
Preferred stock dividends on convertible preferred stock 391 406 1,186 1,201
Net income available to common shareholders - diluted $ 3,253 $ 2,306 $ 9,546 $ 6,991
Weighted average common shares outstanding for basic earnings per common share basic 7,843,578 7,707,917 7,815,222 7,707,917
Add: Dilutive effects of convertible preferred shares 3,078,245 3,196,931 3,101,937 3,196,931
Average shares and dilutive potential common shares outstanding - diluted 10,921,823 10,904,848 10,917,159 10,904,848
Diluted earnings per common share $ 0.30 $ 0.21 $ 0.87 $ 0.64