Description Of Business (Percentage Of Consumer Loans Assigned Based On Unit Volumes) (Details)	3 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans	93.80%	93.60%	93.30%	92.60%	92.30%	92.10%	92.90%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans	6.20%	6.40%	6.70%	7.40%	7.70%	7.90%	7.10%