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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) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Multi-family loans | $ 151,836,000 | $ 163,593,000
Collateralized Debt Obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 992,288,000 | 1,054,335,000
Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 992,288,000 | 1,054,335,000
Level 3 |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 3,206,282,000 |
Equity investments | 260,065,000 | 259,095,000
Level 3 | Collateralized Debt Obligations |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | 992,288,000 | 1,054,335,000
Level 3 | Equity investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Equity investments | $ 185,835,000 |
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 | 0.117 |
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 | 0.183 |
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) | 38 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) | 6 months |
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) | 58 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 | $ 1,857,540,000 |
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 | $ 137,234,000 |
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 | 0.057 |
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 | 0.603 |
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 | 0.008 |
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 | 0.211 |
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 | 0.119 |
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 | 1.000 |
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 | 0.052 |
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 | 0.025 |
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 | 0.484 |
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 | 0.072 |
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 | 0.070 |
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 | 0.292 |
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 | 0.009 |
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 | 0.124 |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation Timeline | 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) | 29 months |
Level 3 | Residential loans and residential loans held in securitization trusts | Liquidation Timeline | 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 | Liquidation Model | Maximum |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, measurement input, liquidation timeline (in months) | 57 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 | $ 550,830 |
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 | 13,000 |
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 | 4,000,000 |
Level 3 | Multi-family loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Multi-family loans | $ 151,836,000 |
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 | 0.115 |
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 | 0.110 |
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) | 43 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) | 4 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) | 183 months |
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 | $ 219,800,000 | $ 212,100,000
Consolidated SLST | Level 3 | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Residential mortgage loans, at fair value | 1,211,508,000 |
Investment in Consolidated SLST limited to securities owned, net carrying value | 219,800,000 |
Consolidated SLST | Level 3 | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Collateralized debt, carrying value | $ 992,288,000 |
Consolidated SLST | Level 3 | Loss Severity | Discounted Cash Flow | Weighted Average | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.204 |
Consolidated SLST | Level 3 | Loss Severity | Discounted Cash Flow | Minimum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Consolidated SLST | Level 3 | Loss Severity | Discounted Cash Flow | Maximum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.233 |
Consolidated SLST | Level 3 | Yield | Discounted Cash Flow | Weighted Average | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.025 |
Consolidated SLST | Level 3 | Yield | Discounted Cash Flow | Minimum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.015 |
Consolidated SLST | Level 3 | Yield | Discounted Cash Flow | Maximum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.111 |
Consolidated SLST | Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Weighted Average | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.053 |
Consolidated SLST | Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Minimum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.024 |
Consolidated SLST | Level 3 | Collateral Prepayment Rate | Discounted Cash Flow | Maximum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.060 |
Consolidated SLST | Level 3 | Collateral Default Rate | Discounted Cash Flow | Weighted Average | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.021 |
Consolidated SLST | Level 3 | Collateral Default Rate | Discounted Cash Flow | Minimum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0 |
Consolidated SLST | Level 3 | Collateral Default Rate | Discounted Cash Flow | Maximum | Collateralized Debt Obligations | VIE, Primary Beneficiary |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Debt, measurement input | 0.142 |

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