Description of Business (Percentage of Consumer Loans Assigned Based on Unit Volumes) (Details)	3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans	90.50%	91.40%	91.70%	92.40%	92.90%	93.90%	94.40%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans	9.50%	8.60%	8.30%	7.60%	7.10%	6.10%	5.60%