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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, 2017	Mar. 31, 2016
(Numerator):
Net income	$ 1,543	$ 1,099
(Denominator):
Weighted average shares outstanding - basic	4,935,421	4,920,315
Potentially dilutive common shares - restricted stock units	2,204	2,802
Weighted average shares outstanding - diluted	4,937,625	4,923,117
Income per common share
Basic	$ 0.31	$ 0.22
Diluted	$ 0.31	$ 0.22

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Number of shares of restricted stock determined by relating the portion of time within a reporting period that restricted shares have been outstanding to the total time in that period. Restricted shares are subject to sales, contractual, regulatory or other restrictions that prevent or inhibit the holder from freely disposing of them before the restriction ends.

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