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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator [Abstract]
Net income	$ 1,832	$ 1,694	$ 5,131	$ 4,226
Denominator [Abstract]
Weighted average shares outstanding – basic (in shares)	4,943,301	4,925,753	4,939,905	4,923,598
Potentially dilutive common shares – restricted stock units (in shares)	2,827	4,169	2,284	2,782
Weighted average shares outstanding – diluted (in shares)	4,946,128	4,929,922	4,942,189	4,926,380
Basic (in usd per share)	$ 0.37	$ 0.34	$ 1.04	$ 0.86
Diluted (in usd per share)	$ 0.37	$ 0.34	$ 1.04	$ 0.86

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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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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