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, 2020	Jun. 30, 2019
Transfers And Servicing [Abstract]
Average interest rate	4.19%	4.65%
Debt issue cost amortization rate	0.55%	0.60%