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Securitizations Net - Summary of Outstanding Balance Net of Discounts and Deals Costs of Securities and Effective Interest Rate (Parenthetical) (Details)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Transfers And Servicing [Abstract]
Average interest rate	3.97%	3.94%
Debt issue cost amortization rate	0.71%	0.59%

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Securitizations average interest rate.

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Securitizations debt issue cost amortization interest rate.

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