Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements Of Changes In Shareholders' Equity [Abstract]
Cash dividends declared	$ 0.37	$ 0.35
Exercise of stock options	42,250	16,899
Purchase of treasury shares		88,000