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Earnings per Common Share - Computation of Basic and Diluted Earnings per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Numerator [Abstract]
Net income	$ 10,135	$ 6,448
Denominator [Abstract]
Weighted average shares outstanding - basic (in shares)	4,953,537	4,941,233
Potentially dilutive common shares - restricted stock units (in shares)	2,839	2,665
Weighted average shares outstanding - diluted (in shares)	4,956,376	4,943,898
Basic (in usd per share)	$ 2.05	$ 1.30
Diluted (in usd per share)	$ 2.04	$ 1.30

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

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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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