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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015
Statement of Stockholders' Equity [Abstract] |  |
Cash dividends declared (in dollars per share) | $ 1.29 | $ 1.26
Exercise of stock options (in shares) | 21,000 | 71,750
Exercise of warrants (in shares) | 0 | 61,796
Purchase of treasury shares (in shares) | 231,132 | 0

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