Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (Unaudited) (Common Stock)	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Common Stock
Shares issued using employee stock purchase plan	1,743	3,531
Shares issued using stock option exercises	47,007	8,800
Number of shares tendered for stock option exercises	18,718
Shares issued using dividend reinvestment plan		644