Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.53	$ 0.46
Exercise of stock options (in shares)	5,638	7,388
Purchase of treasury shares (in shares)	54,740	204,327