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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dividend reinvestment plan, shares     49,964 68,640
Stock purchase and compensation plans, shares     712,994 698,723
Dividends to stockholders, per share $ 0.13 $ 0.13 $ 0.39 $ 0.39
Acquisition of treasury stock, shares     151,555 176,513
Preferred stock, par 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 value per share $ 0 $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000 300,000