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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Computation of Basic and Diluted Shares
Net income	$ 5,610us-gaap_NetIncomeLoss	$ 5,562us-gaap_NetIncomeLoss
Weighted average shares outstanding - basic	7,596,223	7,474,415
Dilutive potential shares from unvested restricted shares	264,867	276,828
Weighted average shares outstanding - diluted	7,861,090	7,751,243
Earnings per share:
Basic	$ 0.74us-gaap_EarningsPerShareBasic	$ 0.74us-gaap_EarningsPerShareBasic
Diluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.72us-gaap_EarningsPerShareDiluted

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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- Definition

The amount of net income (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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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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