Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Consolidated Statements Of Changes In Shareholders' Equity
Stock option exercises/deferred stock unit conversions	144,203	611,253
Purchase of treasury stock, shares	29,823	3,406
Treasury stock issued/sold to the 401(k) stock purchase plan, shares		40,019
Common stock issued/sold to the 401( k) stock purchase plan, shares	22,680	150,165
Cash dividends, per share	$ 1.37	$ 1.33