Description Of Business (Percentage Of Consumer Loans Assigned Based On Unit Volumes) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans	93.70%	92.50%	90.90%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans	6.30%	7.50%	9.10%