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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, 2023 | Dec. 31, 2022
--- | --- | ---
Assets carried at fair value |  |
Investment securities available for sale: | $ 31 | $ 23,645
Derivative assets: |  |
Interest rate caps | 19,604 | 2,473
Derivative liabilities: |  |
Derivative assets | 6,510 | 2,473
Variation Margin | 27,447 |
Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 6,510 |
Interest rate swaps |  |
Derivative assets: |  |
Interest rate caps | 13,094 | 2,473
Derivative liabilities: |  |
Variation Margin | 27,447 |
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 147,116 | 179,746
Assets of disposal group held for sale | 2,960 | 38,428
Total | 5,350,498 | 3,932,820
Derivative liabilities: |  |
Total | 593,737 | 634,495
Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 6,510 | 2,473
Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities: |  |
Derivative liability | 0 | 0
Fair Value, Measurements, Recurring | Interest rate swaps | Central Clearing House |  |
Derivative liabilities: |  |
Derivative liability | 40,500 |
Derivative assets | 13,100 |
Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 754,860 | 827,582
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 827,535 | 1,081,384
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,501,908 | 1,616,114
Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 1,989,324 | 0
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 24,493 | 68,570
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 30,133
Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 856
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 95,792 | 87,534
Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | 593,737 | 634,495
Level 1 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 0 | 0
Assets of disposal group held for sale | 0 | 0
Total | 0 | 0
Derivative liabilities: |  |
Total | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities: |  |
Derivative liability | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | 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 |  |
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 | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 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 | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 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 |  |
Derivative liabilities: |  |
Derivative assets | 6,510 | 2,473
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 0 | 0
Assets of disposal group held for sale | 2,960 | 29,418
Total | 2,023,287 | 131,450
Derivative liabilities: |  |
Total | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 6,510 | 2,473
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities: |  |
Derivative liability | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Derivative Asset |  |
Assets carried at fair value |  |
Assets of disposal group held for sale | 3,000 | 29,400
Level 2 | Fair Value, Measurements, Recurring | 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 |  |
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 | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 1,989,324 | 0
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 24,493 | 68,570
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 30,133
Level 2 | Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 856
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 | 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 |  |
Fair Value | 147,116 | 179,746
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 147,116 | 179,746
Assets of disposal group held for sale | 0 | 9,010
Total | 3,327,211 | 3,801,370
Derivative liabilities: |  |
Total | 593,737 | 634,495
Level 3 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities: |  |
Derivative liability | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 754,860 | 827,582
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 827,535 | 1,081,384
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,501,908 | 1,616,114
Level 3 | Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 0
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 | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 95,792 | 87,534
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | $ 593,737 | 634,495
Level 3 | Fair Value, Measurements, Recurring | Equity investments |  |
Assets carried at fair value |  |
Assets of disposal group held for sale |  | $ 9,000

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