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Asset-Backed Securities Issued - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |
VIE, ownership interest rate |  | 80.00% |
Variable Interest Entity, Primary Beneficiary | Freddie Mac SLST |  |  |
Debt Instrument [Line Items] |  |  |
ABS issued, net, Amortized cost | $ 210,000,000 |  |
Asset-backed securities issued | Freddie Mac SLST |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount |  | $ 179,000,000 | $ 205,000,000
Asset-backed securities issued | Variable Interest Entity, Primary Beneficiary |  |  |
Debt Instrument [Line Items] |  |  |
VIE, ownership interest rate | 100.00% |  |
Debt instrument, face amount |  | 176,000,000 |
Unamortized debt discount |  | $ 3,000,000 |
Debt Instrument interest rate |  | 4.75% |
Asset-backed securities issued | Contractual maturities of over five years |  |  |
Debt Instrument [Line Items] |  |  |
Contractual maturities of securities (in years) |  | 5 years |

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