Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.53	$ 0.44	$ 1.45	$ 1.32
Exercise of stock options (in shares)	3,686	0	29,133	16,639
Stock issued during period (in shares)	0	0	0	440,604
Purchase of treasury shares (in shares)	7,000	0	221,327	0