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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator [Abstract]        
Net income $ 1,756 $ 1,433 $ 3,299 $ 2,532
Denominator [Abstract]        
Weighted average shares outstanding – basic (in shares) 4,940,904 4,924,702 4,938,178 4,922,509
Potentially dilutive common shares – restricted stock units (in shares) 1,822 2,157 2,013 2,089
Weighted average shares outstanding – diluted (in shares) 4,942,726 4,926,859 4,940,191 4,924,598
Basic (in usd per share) $ 0.36 $ 0.29 $ 0.67 $ 0.51
Diluted (in usd per share) $ 0.36 $ 0.29 $ 0.67 $ 0.51