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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dividend reinvestment plan, shares     68,640 74,777
Stock purchase and compensation plans, shares     698,723 607,059
Dividends to stockholders, per share $ 0.13 $ 0.13 $ 0.39 $ 0.39
Acquisition of treasury stock, shares     176,513 137,667
Preferred stock, par or stated value per share $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0 0
Series A Preferred Stock [Member]
        
Preferred stock, par or stated value per share $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000 300,000