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Consolidated Statements of Stockholders' Equity (Parenthetical)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Dividend reinvestment plan, shares 50,013 58,309 63,349
Stock purchase and compensation plans, shares 863,426 769,389 862,662
Dividends to stockholders, per share | $ / shares $ 0.57 $ 0.53 $ 0.52
Acquisition of treasury stock, shares 147,461 154,559 167,846
Preferred stock, par value per share | $ / shares $ 0 $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000 5,000,000
Preferred stock, shares issued 0 0 0
Series A Preferred Stock [Member]      
Preferred stock, par value per share | $ / shares $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000