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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement of Stockholders' Equity [Abstract] |  |  |
Cash dividends declared | $ 1.72 | $ 1.68 | $ 1.60
Exercise of stock options | 32,750 | 81,500 | 20,000
Stock Issued During Period, Shares, Other |  | 61,796 |
Stock Issued During Period, Shares, New Issues | 107,662 |  |
Purchase of treasury shares | 231,132 | 150,385 | 650,799

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