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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
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%