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Earnings Per Share - Calculation of Basic Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 2,661us-gaap_NetIncomeLoss	$ 2,474us-gaap_NetIncomeLoss	$ 2,553us-gaap_NetIncomeLoss	$ 1,958us-gaap_NetIncomeLoss	$ 2,287us-gaap_NetIncomeLoss	$ 2,066us-gaap_NetIncomeLoss	$ 2,502us-gaap_NetIncomeLoss	$ 2,152us-gaap_NetIncomeLoss	$ 9,646us-gaap_NetIncomeLoss	$ 9,007us-gaap_NetIncomeLoss	$ 9,788us-gaap_NetIncomeLoss
Less: distributed earnings allocated to participating securities									(27)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	(25)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic	(23)us-gaap_ParticipatingSecuritiesDistributedAndUndistributedEarningsLossBasic
Net earnings available to common shareholders									$ 9,619us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 8,982us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 9,765us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding including participating securities									4,628,178us-gaap_WeightedAverageNumberOfSharesIssuedBasic	4,676,547us-gaap_WeightedAverageNumberOfSharesIssuedBasic	4,695,876us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Less: average unvested restricted shares									(32,211)us-gaap_WeightedAverageNumberOfSharesRestrictedStock	(30,618)us-gaap_WeightedAverageNumberOfSharesRestrictedStock	(29,888)us-gaap_WeightedAverageNumberOfSharesRestrictedStock
Weighted average common shares outstanding	4,627,338us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,621,298us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,626,309us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,637,172us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,660,096us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,682,655us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,679,971us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,683,659us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,595,967us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,645,929us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	4,665,988us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.42us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 0.45us-gaap_EarningsPerShareBasic	$ 0.53us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic	$ 2.08us-gaap_EarningsPerShareBasic	$ 1.93us-gaap_EarningsPerShareBasic	$ 2.08us-gaap_EarningsPerShareBasic

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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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