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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |
Cash dividends declared (in dollars per share) | $ 0.53 | $ 0.44 | $ 1.45 | $ 1.32
Exercise of stock options (in shares) | 3,686 | 0 | 29,133 | 16,639
Stock issued during period (in shares) | 0 | 0 | 0 | 440,604
Purchase of treasury shares (in shares) | 7,000 | 0 | 221,327 | 0

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