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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dividend reinvestment plan, shares 26,843 29,949
Stock purchase and compensation plans, shares 611,076 547,190
Dividends to stockholders, per share $ 0.28 $ 0.26
Acquisition of treasury stock, shares 129,352 124,819
Preferred stock, par value per share $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Series A Preferred Stock [Member]    
Preferred stock, par value per share $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000