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Securitizations Net - Summary of Outstanding Balance Net of Discounts and Deals Costs of Securities and Effective Interest Rate (Parenthetical) (Details) | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Transfers And Servicing [Abstract] |  |
Average interest rate | 4.12% | 4.19%
Debt issue cost amortization rate | 0.71% | 0.55%

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