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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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
(Numerator):        
Net income $ 1,433 $ 444 $ 2,532 $ 988
Effective dividend and accretion on preferred stock   328   657
Net income available to common shareholders $ 1,433 $ 116 $ 2,532 $ 331
(Denominator):        
Weighted average shares outstanding - basic 4,924,702 4,909,775 4,922,509 4,908,386
Potentially dilutive common shares - restricted stock units 2,157 1,523 2,089 2,793
Weighted average shares outstanding - diluted 4,926,859 4,911,298 4,924,598 4,911,179
Income per common share        
Basic $ 0.29 $ 0.02 $ 0.51 $ 0.07
Diluted $ 0.29 $ 0.02 $ 0.51 $ 0.07