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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dividend reinvestment plan, shares     46,603 47,488
Stock purchase and compensation plans, shares     667,500 577,745
Dividends to stockholders, per share $ 0.13 $ 0.13 $ 0.26 $ 0.26
Acquisition of treasury stock, shares     173,620 136,904
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