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Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared	$ 1.98	$ 1.78	$ 1.72
Exercise of stock options	29,633	16,639	32,750
Stock Issued During Period, Shares, New Issues	0	440,604	107,662
Purchase of treasury shares	290,491	0	231,132

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Aggregate dividends paid during the period for each share of common stock outstanding.

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