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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%