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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
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
(Numerator):    
Net income $ 2,655 $ 7,631
Effective dividend and accretion on preferred stock 1,113 1,138
Net income available to common shareholders $ 1,542 $ 6,493
(Denominator):    
Weighted average shares outstanding - basic 4,910,608 4,902,389
Potentially dilutive common shares - restricted stock units 2,566  
Weighted average shares outstanding - diluted 4,913,174 4,902,389
Income per common share    
Basic $ 0.31 $ 1.32
Diluted $ 0.31 $ 1.32