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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Stockholders' Equity [Abstract] |  |  |
Cash dividends declared | $ 1.98 | $ 1.78 | $ 1.72
Exercise of stock options | 29,633 | 16,639 | 32,750
Stock Issued During Period, Shares, New Issues | 0 | 440,604 | 107,662
Purchase of treasury shares | 290,491 | 0 | 231,132

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