Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 1.29	$ 1.26
Exercise of stock options (in shares)	21,000	71,750
Exercise of warrants (in shares)	0	61,796
Purchase of treasury shares (in shares)	231,132	0