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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dividend reinvestment plan, shares 10,931 13,533
Stock purchase and compensation plans, shares 386,567 469,014
Dividends to stockholders, per share $ 0.15 $ 0.14
Acquisition of treasury stock, shares 122,250 129,257
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