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Earnings per Common Share - Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
(Numerator):        
Net income $ 726 $ 1,247 $ 1,714 $ 3,935
Effective dividend and accretion on preferred stock 328 329 985 810
Net income available to common shareholders $ 398 $ 918 $ 729 $ 3,125
(Denominator):        
Weighted average shares outstanding - basic 4,911,604 4,902,716 4,909,470 4,901,931
Potentially dilutive common shares - restricted stock units 1,857   2,481  
Weighted average shares outstanding - diluted 4,913,461 4,902,716 4,911,951 4,901,931
Income per common share        
Basic $ 0.08 $ 0.19 $ 0.15 $ 0.64
Diluted $ 0.08 $ 0.19 $ 0.15 $ 0.64