Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.74	$ 0.70
Exercise of stock options (in shares)	62,685	16,899
Purchase of treasury shares (in shares)		237,535