Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.88	$ 0.86
Exercise of stock options (in shares)	16,639	20,250
Stock Issued During Period (in shares)	440,604	0
Purchase of treasury shares (in shares)	0	231,132