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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Stockholders' Equity [Abstract] |  |  |
Dividend, per share | $ 0.76 | $ 0.73 | $ 0.66
Excise of stock option, shares | 72,130 | 17,540 | 141,103
Stock dividend, percentage | 5.00% | 5.00% | 5.00%
Stock dividends | 207,794 | 193,306 | 183,538

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