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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Cash dividends declared, per share (in USD per share) | $ 0.77 | $ 0.73 | $ 0.68
Treasury stock (in shares) | 102,649 | 80,862 | 58,762
Common Stock |  |  |
Common stock issued in acquisition (in shares) |  | 4,933,115 |

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