Consolidated Statements Of Stockholders' Equity And Comprehensive Income (Parenthetical) (USD $)	9 Months Ended
Sep. 30, 2011
Consolidated Statements Of Stockholders' Equity And Comprehensive Income
Stock tendered during period shares for redemption of stock options, shares	7,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions, shares	5,000
Shares issued pursuant to Employee Stock Plans, shares	76,000
Cash dividend per common share	$ 0.47
Shares issued pursuant to Dividend Reinvestment Plan, shares	6,000
Shares issued pursuant to Acquisition, shares	27,000

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Number of shares of stock issued during the period pursuant to acquisitions.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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