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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, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | $ 179,746 | $ 239,631
Assets of disposal group held for sale | 38,428 | 0
Total | 3,932,820 | 4,136,097
Liabilities carried at fair value |  |
Total | 634,495 | 839,419
Fair Value, Measurements, Recurring | Interest Rate Cap |  |
Assets carried at fair value |  |
Interest rate caps | 2,473 | 0
Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans: | 827,582 | 1,070,882
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans: | 1,081,384 | 1,703,290
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans: | 1,616,114 | 801,429
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 87,534 | 120,021
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 68,570 | 128,019
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 30,133 | 33,146
Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 856 | 39,679
Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Multi-family collateralized debt obligations | 634,495 | 839,419
Level 1 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 0 | 0
Assets of disposal group held for sale | 0 | 0
Total | 0 | 0
Liabilities carried at fair value |  |
Total | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Interest Rate Cap |  |
Assets carried at fair value |  |
Interest rate caps | 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 | 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 |  |
Multi-family collateralized debt obligations | 0 | 0
Level 2 |  |
Assets carried at fair value |  |
Investment securities available for sale: | 99,559 | 200,844
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 0 | 0
Assets of disposal group held for sale | 29,418 | 0
Total | 131,450 | 200,844
Liabilities carried at fair value |  |
Total | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Interest Rate Cap |  |
Assets carried at fair value |  |
Interest rate caps | 2,473 | 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 | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 68,570 | 128,019
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 30,133 | 33,146
Level 2 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 856 | 39,679
Level 2 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | 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 | 179,746 | 239,631
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Equity investments | 179,746 | 239,631
Assets of disposal group held for sale | 9,010 | 0
Total | 3,801,370 | 3,935,253
Liabilities carried at fair value |  |
Total | 634,495 | 839,419
Level 3 | Fair Value, Measurements, Recurring | Interest Rate Cap |  |
Assets carried at fair value |  |
Interest rate caps | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans: | 827,582 | 1,070,882
Liabilities carried at fair value |  |
Multi-family collateralized debt obligations |  | 839,419
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans: | 1,081,384 | 1,703,290
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans: | 1,616,114 | 801,429
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 87,534 | 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 |  |
Multi-family collateralized debt obligations | $ 634,495 | $ 839,419

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