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Consolidated Statements Of Stockholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Stockholders' Equity [Abstract]      
Stock tendered during period shares for redemption of stock options, shares 7,000 14,000 14,000
Treasury shares issued for Deferred Compensation Plan funding and redemptions, shares 5,000 15,000 5,000
Issuance of common stock shares 76,000 73,000 73,000
Cash dividends per common share $ 0.63 $ 0.6 $ 0.49
Shares issued pursuant to Dividend Reinvestment Plan, shares 8,000 8,000 8,000
Shares issued pursuant to acquisition, shares     99,000