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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets carried at fair value |  |
Investment securities available for sale, at fair value | $ 140,597 | $ 311,284
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 255,014 | 259,095
Total | 4,096,726 | 4,196,580
Liabilities carried at fair value |  |
Total | 904,976 | 1,054,335
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,325,219 | 1,090,930
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,137,005 | 1,266,785
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 811,583 | 691,451
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 119,812 | 163,593
Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 125,589 | 139,395
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 224,776 | 355,666
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 56,243 | 186,440
Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 41,485 | 43,225
Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Collateralized debt obligations, at fair value | 904,976 | 1,054,335
Level 1 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 0 | 0
Total | 0 | 0
Liabilities carried at fair value |  |
Total | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Collateralized debt obligations, at fair value | 0 | 0
Level 2 |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 448,093 | 724,726
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 0 | 0
Total | 448,093 | 724,726
Liabilities carried at fair value |  |
Total | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 125,589 | 139,395
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 224,776 | 355,666
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 56,243 | 186,440
Level 2 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 41,485 | 43,225
Level 2 | Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Collateralized debt obligations, at fair value | 0 | 0
Level 3 |  |
Assets carried at fair value |  |
Equity investments | 255,014 | 259,095
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 255,014 | 259,095
Total | 3,648,633 | 3,471,854
Liabilities carried at fair value |  |
Total | 904,976 | 1,054,335
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,325,219 | 1,090,930
Level 3 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,137,005 | 1,266,785
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 811,583 | 691,451
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 119,812 | 163,593
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale, at fair value | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Residential Collateralized Debt Obligations, at Fair Value | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Collateralized debt obligations, at fair value | $ 904,976 | $ 1,054,335

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