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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
(Numerator):
Net income	$ 1,694	$ 726	$ 4,226	$ 1,714
Effective dividend on preferred stock		328		985
Net income available to common shareholders	$ 1,694	$ 398	$ 4,226	$ 729
(Denominator):
Weighted average shares outstanding - basic	4,925,753	4,911,604	4,923,598	4,909,470
Potentially dilutive common shares - restricted stock units	4,169	1,857	2,782	2,481
Weighted average shares outstanding - diluted	4,929,922	4,913,461	4,926,380	4,911,951
Income per common share
Basic	$ 0.34	$ 0.08	$ 0.86	$ 0.15
Diluted	$ 0.34	$ 0.08	$ 0.86	$ 0.15

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the 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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