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Asset-Backed Securities Issued - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2021 | Dec. 31, 2052 | Mar. 31, 2029 | Jul. 31, 2023 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
VIE, ownership interest rate (as a percent) |  | 80.00% |  |  |  |
Variable Interest Entity, Primary Beneficiary | Point HEI |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
ABS issued, net, Amortized cost |  | $ 146,000,000 |  |  |  |
Variable Interest Entity, Primary Beneficiary | Freddie Mac SLST |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
ABS issued, net, Amortized cost | $ 210,000,000 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary | CoreVest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
ABS issued, net, Amortized cost |  | 270,000,000 |  |  |  |
Asset-backed securities issued | Freddie Mac SLST |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | 163,000,000 |  |  |  | $ 205,000,000
Asset-backed securities issued | CoreVest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | 270,000,000 |  |  |  |
Total funding capacity |  | 300,000,000 |  |  |  |
Bridge Loan |  | 276,000,000 |  |  |  |
Restricted Cash |  | 28,000,000 |  |  |  |
Asset-backed securities issued | Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
VIE, ownership interest rate (as a percent) | 100.00% |  |  |  |  |
Debt instrument, face amount |  | 161,000,000 |  |  |  |
Unamortized debt discount |  | $ 3,000,000 |  |  |  |
Debt Instrument interest rate |  | 4.75% |  |  |  |
Asset-backed securities issued | Variable Interest Entity, Primary Beneficiary | Forecast |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument interest rate |  |  | 2.00% | 2.00% | 7.75% |
Asset-backed securities issued | Variable Interest Entity, Primary Beneficiary | CoreVest |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 267,000,000 |  |  |  |
Unamortized debt discount |  | $ 3,000,000 |  |  |  |
Debt Instrument interest rate |  | 2.34% |  |  |  |
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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