Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 1.05	$ 1.02
Exercise of stock options	18,899	6,576
Purchase of treasury shares	237,535	675,501