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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Dividend reinvestment plan, shares | 5,694 | 6,298
Stock purchase and compensation plans, shares | 371,628 | 349,255
Dividends to stockholders, per share | $ 0.20 | $ 0.18
Acquisition of treasury stock, shares | 102,971 | 103,170
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

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