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Earnings per Common Share - Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
(Numerator):    
Net income $ 1,099 $ 544
Effective dividend on preferred stock   329
Net income available to common shareholders $ 1,099 $ 215
(Denominator):    
Weighted average shares outstanding - basic 4,920,315 4,906,981
Potentially dilutive common shares - restricted stock units 2,802 4,063
Weighted average shares outstanding - diluted 4,923,117 4,911,044
Income per common share    
Basic $ 0.22 $ 0.04
Diluted $ 0.22 $ 0.04