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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Assets carried at fair value |  |
Investment securities available for sale: | $ 24,582 | $ 29,520
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 223,651 | 239,631
Total | 4,800,174 | 4,136,097
Liabilities carried at fair value |  |
Total | 710,233 | 839,419
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 2,193,319 | 1,703,290
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 920,778 | 1,070,882
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,215,095 | 801,429
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 106,825 | 120,021
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 74,822 | 128,019
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 30,096 | 33,146
Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 35,588 | 39,679
Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | 710,233 | 839,419
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 | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | 0 | 0
Level 2 |  |
Assets carried at fair value |  |
Investment securities available for sale: | 140,506 | 200,844
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 0 | 0
Total | 140,506 | 200,844
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 | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 74,822 | 128,019
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 30,096 | 33,146
Level 2 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 35,588 | 39,679
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | 0 | 0
Level 3 |  |
Assets carried at fair value |  |
Equity investments | 223,651 | 239,631
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 223,651 | 239,631
Total | 4,659,668 | 3,935,253
Liabilities carried at fair value |  |
Total | 710,233 | 839,419
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 2,193,319 | 1,703,290
Level 3 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 920,778 | 1,070,882
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,215,095 | 801,429
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 106,825 | 120,021
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | $ 710,233 | $ 839,419

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