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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated Statement of Changes in Stockholders' Equity [Abstract] |  |  |  |
Purchase of treasury stock (in shares) |  | 17,990 | 66,110 | 49,465
Cash dividends (in dollars per share) |  | $ 1.67 | $ 1.58 | $ 1.63
Stock dividend percentage | 5.00% |  |  |
Dividend paid date |  | Jun. 30, 2017 |  |

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