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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dividend reinvestment plan, shares     44,322 49,964
Stock purchase and compensation plans, shares     588,858 712,994
Dividends to stockholders, per share $ 0.13 $ 0.13 $ 0.39 $ 0.39
Acquisition of treasury stock, shares     130,573 151,555
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