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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash dividends declared, per share (in USD per share) | $ 0.82 | $ 0.77 | $ 0.73
Retained Earnings |  |  |
Cash dividends declared, per share (in USD per share) | $ 0.82 | $ 0.77 | $ 0.73
Treasury stock issued (in shares) | 58,906 | 102,649 | 80,862
Common Stock |  |  |
Common stock issued in acquisition (in shares) |  |  | 4,933,115

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