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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
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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 | $ 2,661 us-gaap_NetIncomeLoss | $ 2,474 us-gaap_NetIncomeLoss | $ 2,553 us-gaap_NetIncomeLoss | $ 1,958 us-gaap_NetIncomeLoss | $ 2,287 us-gaap_NetIncomeLoss | $ 2,066 us-gaap_NetIncomeLoss | $ 2,502 us-gaap_NetIncomeLoss | $ 2,152 us-gaap_NetIncomeLoss | $ 9,646 us-gaap_NetIncomeLoss | $ 9,007 us-gaap_NetIncomeLoss | $ 9,788 us-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 |  |  |  |  |  |  |  |  | $ 9,619 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 8,982 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 9,765 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding including participating securities |  |  |  |  |  |  |  |  | 4,628,178 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 4,676,547 us-gaap_WeightedAverageNumberOfSharesIssuedBasic | 4,695,876 us-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 | 4,627,338 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,621,298 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,626,309 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,637,172 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,660,096 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,682,655 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,679,971 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,683,659 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,595,967 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,645,929 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,665,988 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 2.08 us-gaap_EarningsPerShareBasic | $ 1.93 us-gaap_EarningsPerShareBasic | $ 2.08 us-gaap_EarningsPerShareBasic

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