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Fair Value of Financial Instruments - Schedule of Quantitative Information Regarding Significant and Unobservable Inputs Used in the Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Consolidated SLST CDOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 710,233,000 | $ 839,419,000
Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 710,233,000 | 839,419,000
Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investment in Consolidated SLST limited to securities owned, net carrying value | 208,600,000 | 230,300,000
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 4,329,192,000 |
Equity investments | 223,651,000 | 239,631,000
Level 3 | Consolidated SLST CDOs |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 710,233,000 | $ 839,419,000
Level 3 | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity investments | $ 189,773,000 |
Level 3 | Loss severity | Discounted cash flow | Weighted Average | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0 |
Level 3 | Discount rate | Discounted cash flow | Weighted Average | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.125 |
Level 3 | Discount rate | Discounted cash flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.110 |
Level 3 | Discount rate | Discounted cash flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Investments in unconsolidated entities, measurement input | 0.154 |
Level 3 | Months to assumed redemption | Discounted cash flow | Weighted Average | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 24 months |
Level 3 | Months to assumed redemption | Discounted cash flow | Minimum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 1 month |
Level 3 | Months to assumed redemption | Discounted cash flow | Maximum | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, redemption period (in months) | 51 months |
Level 3 | Residential loans and residential loans held in securitization trusts |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 3,318,357,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation model |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 90,057,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.048 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Discounted cash flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CPR | Discounted cash flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.462 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.004 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Discounted cash flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Lifetime CDR | Discounted cash flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.215 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.067 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Discounted cash flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Loss severity | Discounted cash flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.965 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.060 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Discounted cash flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.046 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Discounted cash flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.649 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Liquidation model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.078 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Liquidation model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.075 |
Level 3 | Residential loans and residential loans held in securitization trusts | Yield | Liquidation model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.296 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation | Liquidation model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.010 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation | Liquidation model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0 |
Level 3 | Residential loans and residential loans held in securitization trusts | Annual home price appreciation | Liquidation model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input | 0.278 |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Liquidation model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 26 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Liquidation model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 9 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation timeline (months) | Liquidation model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 50 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Liquidation model | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 801,412 |
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Liquidation model | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 17,000 |
Level 3 | Residential loans and residential loans held in securitization trusts | Property value | Liquidation model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 4,300,000 |
Level 3 | Multi-family loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Multi-family loans | $ 106,825,000 |
Level 3 | Multi-family loans | Loss severity | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0 |
Level 3 | Multi-family loans | Discount rate | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.113 |
Level 3 | Multi-family loans | Discount rate | Discounted cash flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.100 |
Level 3 | Multi-family loans | Discount rate | Discounted cash flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, measurement input | 0.195 |
Level 3 | Multi-family loans | Months to assumed redemption | Discounted cash flow | Weighted Average |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 36 months |
Level 3 | Multi-family loans | Months to assumed redemption | Discounted cash flow | Minimum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 3 months |
Level 3 | Multi-family loans | Months to assumed redemption | Discounted cash flow | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Financial instruments owned, assumed redemption period (in months) | 57 months |
Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | $ 920,778,000 |
Investment in Consolidated SLST limited to securities owned, net carrying value | 208,600,000 |
Level 3 | Consolidated SLST | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 710,233,000 |
Level 3 | Consolidated SLST | Loss severity | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.166 |
Level 3 | Consolidated SLST | Loss severity | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Level 3 | Consolidated SLST | Loss severity | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.195 |
Level 3 | Consolidated SLST | Yield | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.046 |
Level 3 | Consolidated SLST | Yield | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.037 |
Level 3 | Consolidated SLST | Yield | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.100 |
Level 3 | Consolidated SLST | Collateral prepayment rate | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.080 |
Level 3 | Consolidated SLST | Collateral prepayment rate | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.030 |
Level 3 | Consolidated SLST | Collateral prepayment rate | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.097 |
Level 3 | Consolidated SLST | Collateral default rate | Discounted cash flow | Weighted Average | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.017 |
Level 3 | Consolidated SLST | Collateral default rate | Discounted cash flow | Minimum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Level 3 | Consolidated SLST | Collateral default rate | Discounted cash flow | Maximum | Consolidated SLST CDOs | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.094 |

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