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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Purchase of Company's common shares at cost (shares) | 419,498 | 30,887 | 1,776
Cash dividends declared, per share (in usd per share) | $ 0.84 | $ 0.71 | $ 0.55
Common Stock issued under incentive plans (shares) | 24,987 | 17,691 | 8,485
Common Stock |  |  |
Common stock issued for acquisition (shares) |  |  | 1,936,117

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