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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income		$ 3,436	$ 3,222	$ 3,223	$ 2,839	$ 3,194	$ 3,015	$ 2,974	$ 2,481	$ 12,720	$ 11,664	$ 10,340
Less: distributed earnings allocated to participating securities										(45)	(37)	(31)
Less: undistributed earnings allocated to participating securities										(77)	(64)	(47)
Net earnings available to common shareholders										$ 12,598	$ 11,563	$ 10,262
Weighted average common shares outstanding including participating securities										9,250,825	9,224,230	9,234,116
Less: average unvested restricted shares										(88,664)	(79,964)	(70,000)
Weighted average common shares outstanding		9,266,584	9,252,919	9,241,750	9,241,750	9,241,662	9,225,532	9,211,068	9,218,452	9,162,161	9,144,266	9,164,116
Basic and diluted earnings per share	[1]									$ 1.38	$ 1.27	$ 1.12
[1] Share data has been adjusted to reflect a 2-for-1 stock split on September 20, 2017

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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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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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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 [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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