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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Consolidated Statements Of Changes In Shareholders' Equity [Abstract] |  |
Cash dividends declared | $ 0.27 | $ 0.24
Acquisition of treasury stock, shares | 15,163 | 2,605
Treasury shares issued under employee stock purchase plan, shares | 150 | 200
Treasury shares issued under dividend reinvestment plan, shares | 10,150 | 5,911
Common stock issued under incentive stock option plans, shares | 6,982 | 6,518

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