Per Share Data (Computations of Basic Earnings Per Share and Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Basic Earnings per Share:
Net Income	$ 7,306us-gaap_NetIncomeLoss	$ 6,305us-gaap_NetIncomeLoss
Weighted Average Shares Outstanding	13,221,455	13,179,188
Basic Earnings per Share (USD per share)	$ 0.55us-gaap_EarningsPerShareBasic	$ 0.48us-gaap_EarningsPerShareBasic
Diluted Earnings per Share:
Net Income	$ 7,306us-gaap_NetIncomeLoss	$ 6,305us-gaap_NetIncomeLoss
Weighted Average Shares Outstanding	13,221,455	13,179,188
Potentially Dilutive Shares, Net	16,038	24,513
Diluted Weighted Average Shares Outstanding	13,237,493	13,203,701
Diluted Earnings per Share (USD per share)	$ 0.55us-gaap_EarningsPerShareDiluted	$ 0.48us-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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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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