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Description of Business (Percentage of Consumer Loans Assigned Based on Unit Volumes) (Details)
 3 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Portfolio Program [Member]              
Description Of Business [Line Items]              
Percentage of new consumer loans 87.30% 87.70% 88.60% 89.00% 90.50% 91.40% 91.70%
Purchase Program [Member]              
Description Of Business [Line Items]              
Percentage of new consumer loans 12.70% 12.30% 11.40% 11.00% 9.50% 8.60% 8.30%