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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
	Mar. 31, 2019	Mar. 31, 2018
Numerator [Abstract]
Net income	$ 2,261	$ 2,687
Denominator [Abstract]
Weighted average shares outstanding – basic (in shares)	4,960,264	4,949,112
Potentially dilutive common shares – restricted stock units (in shares)	3,870	3,261
Weighted average shares outstanding – diluted (in shares)	4,964,134	4,952,373
Income per common share
Basic (in usd per share)	$ 0.46	$ 0.54
Diluted (in usd per share)	$ 0.46	$ 0.54

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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