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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dividend reinvestment plan, shares     33,514 46,603
Stock purchase and compensation plans, shares     682,661 667,500
Dividends to stockholders, per share $ 0.13 $ 0.13 $ 0.26 $ 0.26
Acquisition of treasury stock, shares     151,113 173,620
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