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Description of Business (Percentage of Consumer Loans Assigned Based on Volumes) (Details) | 3 Months Ended
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Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022
Portfolio Program [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Percentage of new consumer loans unit volume |  | 78.20% | 77.20% | 74.80% | 72.40% | 72.10%
Percentage of new consumer loans dollar volume | [1] | 76.60% | 75.00% | 71.70% | 68.60% | 68.10%
Purchase Program [Member] |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Percentage of new consumer loans unit volume |  | 21.80% | 22.80% | 25.20% | 27.60% | 27.90%
Percentage of new consumer loans dollar volume | [1] | 23.40% | 25.00% | 28.30% | 31.40% | 31.90%
[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.

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- Details
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