Description of Business (Percentage of Consumer Loans Assigned Based on Volumes)		3 Months Ended
		Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume		66.90%	65.40%	65.30%	64.10%	62.50%	64.90%
Percentage of new consumer loans dollar volume	[1]	64.00%	62.70%	62.70%	60.90%	59.10%	60.50%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume		33.10%	34.60%	34.70%	35.90%	37.50%	35.10%
Percentage of new consumer loans dollar volume	[1]	36.00%	37.30%	37.30%	39.10%	40.90%	39.50%

[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.