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Earnings per Common Share - Computation of Basic and Diluted Earnings per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
(Numerator):    
Net income $ 5,907 $ 2,655
Effective dividend on preferred stock   1,113
Net income available to common shareholders $ 5,907 $ 1,542
(Denominator):    
Weighted average shares outstanding - basic 4,924,636 4,910,608
Potentially dilutive common shares - restricted stock units 3,548 2,566
Weighted average shares outstanding - diluted 4,928,184 4,913,174
Income per common share    
Basic $ 1.20 $ 0.31
Diluted $ 1.20 $ 0.31