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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dividend reinvestment plan, shares 23,493 28,607 38,741
Stock purchase and compensation plans, shares 540,337 635,521 720,323
Dividends to stockholders, per share $ 0.74 $ 0.66 $ 0.61
Acquisition of treasury stock, shares 110,398 136,205 152,595
Preferred stock, par value per share $ 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 $ 0 $ 0 $ 0
Preferred stock, shares authorized 300,000 300,000 300,000