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Fair Value of Financial Instruments - Significant Unobservable Outputs (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateralized debt obligations | $ 839,419,000 | $ 1,054,335,000
VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateralized debt obligations | 839,419,000 | 1,054,335,000
VIE, Primary Beneficiary | Consolidated SLST |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Variable interest entity, primary beneficiary, maximum loss exposure, amount | 230,300,000 | 212,100,000
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | 3,575,601,000 |
Fair Value | 239,631,000 | 259,095,000
Level 3 | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value | 191,238,000 |
Level 3 | VIE, Primary Beneficiary | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateralized debt obligations | 839,419,000 | $ 1,054,335,000
Level 3 | VIE, Primary Beneficiary | Consolidated SLST |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | 1,070,882,000 |
Level 3 | VIE, Primary Beneficiary | Consolidated SLST | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Collateralized debt obligations | $ 839,419,000 |
Level 3 | Weighted Average | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity method investment, measurement input |  | 0.00%
Level 3 | Weighted Average | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.164 |
Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.029 |
Level 3 | Weighted Average | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input | 12.40% |
Level 3 | Weighted Average | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans, measurement input, redemption period | 29 months |
Level 3 | Weighted Average | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.104 |
Level 3 | Weighted Average | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.019 |
Level 3 | Minimum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0 |
Level 3 | Minimum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.016 |
Level 3 | Minimum | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input | 11.00% |
Level 3 | Minimum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans, measurement input, redemption period | 2 years |
Level 3 | Minimum | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.037 |
Level 3 | Minimum | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0 |
Level 3 | Maximum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.230 |
Level 3 | Maximum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.170 |
Level 3 | Maximum | Discount Rate | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input | 15.40% |
Level 3 | Maximum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loans, measurement input, redemption period | 57 years |
Level 3 | Maximum | Measurement Input Collateral Prepayment Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.130 |
Level 3 | Maximum | Measurement Input Collateral Default Rate | Valuation Technique, Discounted Cash Flow | Residential collateralized debt obligations, at fair value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term debt, measurement input | 0.081 |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | $ 2,411,356,000 |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | $ 93,363,000 |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Lifetime CPR | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 8.50% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Lifetime CDR | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 0.50% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 9.20% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 4.60% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Yield | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 7.20% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Annual Home Price Appreciation | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 1.80% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input Liquidation Timeline Period | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input, liquidation timeline, months | 28 years |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Weighted Average | Measurement Input, Appraised Value | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | $ 677,928 |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Lifetime CPR | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 0.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Lifetime CDR | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 0.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 0.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 2.30% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Yield | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 7.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Annual Home Price Appreciation | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 0.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input Liquidation Timeline Period | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input, liquidation timeline, months | 9 months |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Minimum | Measurement Input, Appraised Value | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | $ 15,000 |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Lifetime CPR | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 48.70% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Lifetime CDR | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 29.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input, Loss Severity | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 100.00% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Yield | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 40.80% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Yield | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 26.10% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Annual Home Price Appreciation | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input | 38.20% |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input Liquidation Timeline Period | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, measurement input, liquidation timeline, months | 50 months |
Residential Loans And Residential Loans Held In Securitization Trusts | Level 3 | Maximum | Measurement Input, Appraised Value | Valuation Technique Liquidation Model |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential loans, fair value | $ 6,500,000 |
Preferred equity and mezzanine loan investments | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Multi-family loans, at fair value | $ 120,021,000 |
Preferred equity and mezzanine loan investments | Level 3 | Weighted Average | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity method investment, measurement input |  | 0.00%
Preferred equity and mezzanine loan investments | Level 3 | Weighted Average | Discount Rate | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input | 11.30% |
Preferred equity and mezzanine loan investments | Level 3 | Weighted Average | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input, assumed redemption period | 37 months |
Preferred equity and mezzanine loan investments | Level 3 | Minimum | Discount Rate | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input | 10.00% |
Preferred equity and mezzanine loan investments | Level 3 | Minimum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input, assumed redemption period | 1 month |
Preferred equity and mezzanine loan investments | Level 3 | Maximum | Discount Rate | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input | 19.50% |
Preferred equity and mezzanine loan investments | Level 3 | Maximum | Measurement Input Months To Assumed Redemption | Valuation Technique, Discounted Cash Flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Financial instruments, measurement input, assumed redemption period | 60 months |

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