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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator [Abstract]        
Net income $ 2,676 $ 1,832 $ 7,814 $ 5,131
Denominator [Abstract]        
Weighted average shares outstanding – basic (in shares) 4,955,162 4,943,301 4,952,351 4,939,905
Potentially dilutive common shares – restricted stock units (in shares) 3,000 2,827 2,604 2,284
Weighted average shares outstanding – diluted (in shares) 4,958,162 4,946,128 4,954,955 4,942,189
Income per common share        
Basic (in usd per share) $ 0.54 $ 0.37 $ 1.58 $ 1.04
Diluted (in usd per share) $ 0.54 $ 0.37 $ 1.58 $ 1.04