Description of Business (Percentage of Consumer Loans Assigned Based on Volumes)		3 Months Ended
		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume		72.70%	71.80%	69.90%	66.90%	65.40%
Percentage of new consumer loans dollar volume	[1]	68.60%	68.00%	66.80%	64.00%	62.70%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume		27.30%	28.20%	30.10%	33.10%	34.60%
Percentage of new consumer loans dollar volume	[1]	31.40%	32.00%	33.20%	36.00%	37.30%

[1] Represents advances paid to Dealers on Consumer Loans assigned under our Portfolio Program and one-time payments made to Dealers to purchase Consumer Loans assigned under our Purchase Program. Payments of Dealer Holdback (as defined below) and accelerated Dealer Holdback are not included.