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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets carried at fair value |  |
Investment securities available for sale: | $ 0 | $ 31
Derivative assets: |  |
Derivative assets | 38,048 | 19,604
Derivative liabilities |  |
Derivative Asset | (7,143) | (6,510)
Variation Margin | 9,268 | 27,447
Interest rate caps |  |
Derivative assets: |  |
Derivative assets | 7,123 | 6,510
Interest rate swaps |  |
Derivative assets: |  |
Derivative assets | 30,879 | 13,094
Derivative liabilities |  |
Variation Margin | 0 | 27,447
U.S. Treasury futures |  |
Derivative assets: |  |
Derivative assets | 26 |
Derivative liabilities |  |
Variation Margin | 0 |
Credit default swaps |  |
Derivative liabilities |  |
Variation Margin | 9,268 |
Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures |  |
Derivative liabilities |  |
Variation Margin | 7,000 | 27,400
Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 2,217,485 |
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 137,943 | 147,116
Assets of disposal group held for sale | 740 | 2,960
Total | 5,582,176 | 5,350,498
Derivative liabilities |  |
Total | 1,079,768 | 593,737
Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Derivative assets | 7,123 | 6,510
Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Derivative assets | 20 | 0
Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Fair Value, Measurements, Recurring | U.S. Treasury futures |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Fair Value, Measurements, Recurring | Credit default swaps |  |
Derivative liabilities |  |
Derivative liability | 0 | 0
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House |  |
Derivative liabilities |  |
Derivative liability | 23,900 | 40,500
Derivative Asset | (30,900) | (13,100)
Fair Value, Measurements, Recurring | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 738,126 | 754,860
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 640,729 | 827,535
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,724,250 | 1,501,908
Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 2,217,485 | 1,989,324
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 23,855 | 24,493
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 91,905 | 95,792
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST | 582,627 | 593,737
Fair Value, Measurements, Recurring | Residential loan securitizations |  |
Liabilities carried at fair value |  |
Consolidated SLST | 497,141 | 0
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: |  |
Derivative assets | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury futures |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Credit default 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 | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST | 0 | 0
Level 1 | Fair Value, Measurements, Recurring | Residential loan securitizations |  |
Liabilities carried at fair value |  |
Consolidated SLST | 0 | 0
Level 2 |  |
Derivative liabilities |  |
Derivative Asset | (7,143) | (6,510)
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 0 | 0
Assets of disposal group held for sale | 740 | 2,960
Total | 2,249,223 | 2,023,287
Derivative liabilities |  |
Total | 497,141 | 0
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Derivative assets | 7,123 | 6,510
Level 2 | Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Derivative assets | 20 | 0
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury futures |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Credit default 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 | 700 | 3,000
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: | 2,217,485 | 1,989,324
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 23,855 | 24,493
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 | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Residential loan securitizations |  |
Liabilities carried at fair value |  |
Consolidated SLST | 497,141 | 0
Level 3 |  |
Assets carried at fair value |  |
Fair Value | 137,943 | 147,116
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 137,943 | 147,116
Assets of disposal group held for sale | 0 | 0
Total | 3,332,953 | 3,327,211
Derivative liabilities |  |
Total | 582,627 | 593,737
Level 3 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Option |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury futures |  |
Derivative assets: |  |
Derivative assets | 0 | 0
Level 3 | Fair Value, Measurements, Recurring | Credit default 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 | 738,126 | 754,860
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 640,729 | 827,535
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,724,250 | 1,501,908
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 | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 91,905 | 95,792
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities carried at fair value |  |
Consolidated SLST | 582,627 | 593,737
Level 3 | Fair Value, Measurements, Recurring | Residential loan securitizations |  |
Liabilities carried at fair value |  |
Consolidated SLST | $ 0 | $ 0

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