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Earnings Per Share (Details) (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
Basic Earnings Per Share
Net income	$ 1,556us-gaap_NetIncomeLoss	$ 1,554us-gaap_NetIncomeLoss	$ 1,337us-gaap_NetIncomeLoss	$ 1,248us-gaap_NetIncomeLoss	$ 1,346us-gaap_NetIncomeLoss	$ 1,201us-gaap_NetIncomeLoss	$ 1,312us-gaap_NetIncomeLoss	$ 1,235us-gaap_NetIncomeLoss	$ 5,695us-gaap_NetIncomeLoss	$ 5,094us-gaap_NetIncomeLoss	$ 4,262us-gaap_NetIncomeLoss
Weighted average common shares outstanding									3,298,177us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	3,296,408us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	3,296,462us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per share	$ 0.48us-gaap_EarningsPerShareBasic	$ 0.47us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.37us-gaap_EarningsPerShareBasic	$ 1.73us-gaap_EarningsPerShareBasic	$ 1.55us-gaap_EarningsPerShareBasic	$ 1.29us-gaap_EarningsPerShareBasic
Diluted Earnings Per Share
Plus dilutive stock options and restricted stock units									12,116us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	5,653us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	436us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average common shares outstanding and potentially dilutive shares									3,310,293us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	3,302,061us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	3,296,898us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.47us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ 0.41us-gaap_EarningsPerShareDiluted	$ 0.36us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.37us-gaap_EarningsPerShareDiluted	$ 1.72us-gaap_EarningsPerShareDiluted	$ 1.54us-gaap_EarningsPerShareDiluted	$ 1.29us-gaap_EarningsPerShareDiluted

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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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