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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dividend reinvestment plan, shares 22,916 22,697
Stock purchase and compensation plans, shares 540,322 453,409
Dividends to stockholders, per share $ 0.13 $ 0.13
Acquisition of treasury stock, shares 168,614 135,095
Preferred stock, par or stated value per share $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Series A Preferred Stock [Member]
    
Preferred stock, par or stated value per share $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000