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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | $ 239,631 | $ 259,095
Total | 4,136,097 | 4,196,580
Liabilities carried at fair value |  |
Total | 839,419 | 1,054,335
Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans: | 1,070,882 | 1,266,785
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans: | 1,703,290 | 1,090,930
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans: | 801,429 | 691,451
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 120,021 | 163,593
Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 0 | 139,395
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 128,019 | 355,666
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 33,146 | 186,440
Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 39,679 | 43,225
Fair Value, Measurements, Recurring | Residential collateralized debt obligations, at fair value | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Multi-family collateralized debt obligations | 839,419 | 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 | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans: | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans: | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans: | 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 |  |
Debt Securities, Available-for-sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 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 |  |
Multi-family collateralized debt obligations | 0 | 0
Level 2 |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 200,844 | 724,726
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 0 | 0
Total | 200,844 | 724,726
Liabilities carried at fair value |  |
Total | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans: | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans: | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans: | 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 |  |
Debt Securities, Available-for-sale | 0 | 139,395
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 128,019 | 355,666
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 33,146 | 186,440
Level 2 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 39,679 | 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 |  |
Multi-family collateralized debt obligations | 0 | 0
Level 3 |  |
Assets carried at fair value |  |
Equity investments | 239,631 | 259,095
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 239,631 | 259,095
Total | 3,935,253 | 3,471,854
Liabilities carried at fair value |  |
Total | 839,419 | 1,054,335
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans: | 1,070,882 | 1,266,785
Liabilities carried at fair value |  |
Multi-family collateralized debt obligations |  | 1,054,335
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans: | 1,703,290 | 1,090,930
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans: | 801,429 | 691,451
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 120,021 | 163,593
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Debt Securities, Available-for-sale | 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 |  |
Multi-family collateralized debt obligations | $ 839,419 | $ 1,054,335

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