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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
12 Months Ended
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