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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, 2023 | Dec. 31, 2022
--- | --- | ---
Assets carried at fair value |  |
Investment securities available for sale: | $ 23,951 | $ 23,645
Derivative assets: |  |
Total derivative assets | 17,529 | 2,473
Derivative liabilities |  |
Derivative assets | 2,610 | 2,473
Variation Margin | 0 |
Interest rate caps |  |
Derivative assets: |  |
Total derivative assets | 2,454 |
Interest rate swaps |  |
Derivative assets: |  |
Total derivative assets | 14,919 | 2,473
Derivative liabilities |  |
Variation Margin | 0 |
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 168,755 | 179,746
Assets of disposal group held for sale | 28,474 | 38,428
Total | 4,168,345 | 3,932,820
Derivative liabilities |  |
Total | 617,168 | 634,495
Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Total derivative assets | 2,454 | 2,473
Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Total derivative assets | 156 | 0
Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities |  |
Derivative liability | 0 | 0
Variation Margin | 14,000 |
Fair Value, Measurements, Recurring | Interest rate swaps | Central Clearing House |  |
Derivative liabilities |  |
Derivative liability | (1,000) |
Derivative assets | 14,900 |
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 757,264 | 1,081,384
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 789,969 | 827,582
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,589,579 | 1,616,114
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 97,422 | 87,534
Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 640,133 | 0
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 63,742 | 68,570
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 30,397 | 30,133
Fair Value, Measurements, Recurring | ABS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 0 | 856
Fair Value, Measurements, Recurring | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | 617,168 | 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: |  |
Total derivative assets | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Total derivative assets | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities |  |
Derivative liability | 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: | 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: | 734,272 | 99,559
Derivative liabilities |  |
Derivative assets | 2,610 | 2,473
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 0 | 0
Assets of disposal group held for sale | 20,779 | 29,418
Total | 757,661 | 131,450
Derivative liabilities |  |
Total | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Total derivative assets | 2,454 | 2,473
Level 2 | Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Total derivative assets | 156 | 0
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 | 20,800 | 29,400
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: | 640,133 | 0
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 63,742 | 68,570
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 30,397 | 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 | 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 | 168,755 | 179,746
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 168,755 | 179,746
Assets of disposal group held for sale | 7,695 | 9,010
Total | 3,410,684 | 3,801,370
Derivative liabilities |  |
Total | 617,168 | 634,495
Level 3 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Total derivative assets | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Total derivative assets | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities |  |
Derivative liability | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 757,264 | 1,081,384
Level 3 | Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 789,969 | 827,582
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,589,579 | 1,616,114
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 97,422 | 87,534
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 | Consolidated SLST CDOs | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST CDOs | 617,168 | 634,495
Level 3 | Fair Value, Measurements, Recurring | Equity investments |  |
Assets carried at fair value |  |
Assets of disposal group held for sale | $ 7,700 | $ 9,000

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