Description of Business (Percentage of Consumer Loans Assigned Based on Volumes)	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020		Dec. 31, 2019		Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume	64.10%	62.50%	64.90%		67.40%		67.20%		66.70%		67.40%
Percentage of new consumer loans dollar volume	60.90%	59.10%	60.50%	[1]	64.00%	[1]	64.10%	[1]	63.70%	[1]	65.00%	[1]
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans unit volume	35.90%	37.50%	35.10%		32.60%		32.80%		33.30%		32.60%
Percentage of new consumer loans dollar volume	39.10%	40.90%	39.50%	[1]	36.00%	[1]	35.90%	[1]	36.30%	[1]	35.00%	[1]

[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.