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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Dividend reinvestment plan, shares |  |  | 17,683 | 22,278 |
Stock purchase and compensation plans, shares |  |  | 484,491 | 537,588 |
Dividends to stockholders, per share | $ 0.18 | $ 0.16 | $ 0.54 | $ 0.48 |
Acquisition of treasury stock, shares |  |  | 108,311 | 136,012 |
Preferred stock, par value per share | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Preferred stock, shares authorized | 5,000,000 | 5,000,000 | 5,000,000 | 5,000,000 | 5,000,000
Preferred stock, shares issued | 0 | 0 | 0 | 0 | 0
Series A Preferred Stock [Member] |  |  |  |  |
Preferred stock, par value per share | $ 0 | $ 0 | $ 0 | $ 0 |
Preferred stock, shares authorized | 300,000 | 300,000 | 300,000 | 300,000 |

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