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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Cash dividends declared | $ 1.78 | $ 1.72 | $ 1.68
Exercise of stock options | 16,639 | 32,750 | 81,500
Stock Issued During Period, Shares, Other | 0 | 0 | 61,796
Stock Issued During Period, Shares, New Issues | 440,604 | 107,662 | 0
Purchase of treasury shares | 0 | 231,132 | 150,385

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