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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 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
(Numerator):        
Net income $ 444 $ 1,542 $ 988 $ 2,688
Effective dividend and accretion on preferred stock 328 261 657 481
Net income available to common shareholders $ 116 $ 1,281 $ 331 $ 2,207
(Denominator):        
Weighted average shares outstanding - basic 4,909,775 4,901,599 4,908,386 4,901,532
Potentially dilutive common shares - restricted stock units 1,523   2,793  
Weighted average shares outstanding - diluted 4,911,298 4,901,599 4,911,179 4,901,532
Income per common share        
Basic $ 0.02 $ 0.26 $ 0.07 $ 0.45
Diluted $ 0.02 $ 0.26 $ 0.07 $ 0.45