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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 2,772	$ 2,620	$ 2,597	$ 2,351	$ 2,661	$ 2,474	$ 2,553	$ 1,958	$ 10,340	$ 9,646	$ 9,007
Less: distributed earnings allocated to participating securities									(31)	(27)	(25)
Less: undistributed earnings allocated to participating securities									(47)	(40)	(34)
Net earnings available to common shareholders									$ 10,262	$ 9,579	$ 8,948
Weighted average common shares outstanding including participating securities									4,617,058	4,628,178	4,676,547
Less: average unvested restricted shares									(35,000)	(32,278)	(30,618)
Weighted average common shares outstanding	4,621,122	4,615,379	4,608,453	4,623,322	4,627,338	4,621,298	4,626,309	4,637,172	4,582,058	4,595,900	4,645,929
Basic and diluted earnings per share									$ 2.24	$ 2.08	$ 1.93

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or 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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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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Amount of earnings (loss) distributed and earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

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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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