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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract] |  |  |  |
Cash dividends declared | $ 0.30 | $ 0.27 | $ 0.87 | $ 0.78
Acquisition of treasury stock, shares | 48,825 |  | 103,588 | 2,605
Treasury shares issued under employee stock purchase plan, shares | 10 | 381 | 2,270 | 2,944
Treasury shares issued under dividend reinvestment plan, shares | 9,986 | 12,957 | 29,690 | 30,966
Incentive stock options exercised, shares | 200 | 1,600 | 7,182 | 12,268

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