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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract] |  |  |  |
Cash dividends declared | $ 0.30 | $ 0.27 | $ 0.57 | $ 0.51
Acquisition of treasury stock, shares | 39,600 |  | 54,763 | 2,605
Treasury shares issued under employee stock purchase plan, shares | 2,110 | 2,363 | 2,260 | 2,563
Treasury shares issued under dividend reinvestment plan, shares | 9,554 | 12,098 | 19,704 | 18,009
Common stock issued under incentive stock option plans, shares |  | 4,150 | 6,982 | 10,668

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