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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity |  |  |
Dividends declared (in dollars per share) | $ 1.26 | $ 1.24 | $ 1.24
Common stock grants awarded, shares | 2,362 |  |
Share retired, shares | 32 | 16,463 | 137,752

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