Consolidated Statements Of Changes In Shareholders Equity (Parenthetical) (USD $)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Stock option exercises	197,961	144,203
Purchase of treasury stock, shares		29,823
Common stock issued/sold to the 401(k) stock purchase plan, shares		22,680
Cash dividends, per share	$ 1.42	$ 1.37