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Consolidated Statement of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Consolidated Statement of Changes in Stockholders' Equity [Abstract] |  |  |
Purchase of treasury stock (in shares) | 66,110 | 49,465 | 15,474
Cash dividends (in dollars per share) | $ 1.66 | $ 1.71 | $ 2.15
Dividend paid date | Jun. 30, 2016 |  |

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