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Consolidated Statements of Changes in Shareholders' Equity Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement of Stockholders' Equity [Abstract] |  |  |  |
Cash dividends declared (in dollars per share) | $ 0.53 | $ 0.46 | $ 1.06 | $ 0.92
Exercise of stock options (in shares) | 2,502 | 17,760 | 8,140 | 25,147
Purchase of treasury shares (in shares) | 107,210 | 10,000 | 161,950 | 214,327

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