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Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | ---
Assets carried at fair value |  |  |
Investment securities available for sale: | $ 4,646,812,000 | $ 3,828,544,000 |
Derivative assets: |  |  |
Interest rate caps | 13,823,000 | 64,950,000 |
Mortgage servicing rights | 20,297,000 | 21,003,000 | $ 0
Derivative liabilities |  |  |
Derivative assets | 3,530,000 | 56,000 |
Variation Margin | 28,966,000 | 9,120,000 |
Interest rate caps |  |  |
Derivative assets: |  |  |
Interest rate caps | 346,000 | 56,000 |
Interest rate swaps |  |  |
Derivative assets: |  |  |
Interest rate caps | 10,293,000 | 63,942,000 |
Derivative liabilities |  |  |
Variation Margin | 20,129,000 | 0 |
U.S. Treasury futures |  |  |
Derivative assets: |  |  |
Interest rate caps |  | 952,000 |
Derivative liabilities |  |  |
Variation Margin | 967,000 | 0 |
Credit default swaps |  |  |
Derivative liabilities |  |  |
Variation Margin | 7,870,000 | 9,120,000 |
Agency RMBS |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 4,558,720,000 | 3,136,812,000 |
U.S. Treasury securities |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 24,305,000 | 622,045,000 |
Fair Value, Measurements, Recurring |  |  |
Assets carried at fair value |  |  |
Equity investments | 93,999,000 | 113,492,000 |
Derivative assets: |  |  |
Assets of disposal group held for sale | 222,000 | 67,000 |
Total | 8,765,350,000 | 7,891,092,000 |
Derivative liabilities |  |  |
Total | 2,568,902,000 | 2,195,990,000 |
Fair Value, Measurements, Recurring | Senior unsecured notes |  |  |
Liabilities carried at fair value |  |  |
Senior unsecured notes | 139,761,000 | 60,310,000 |
Fair Value, Measurements, Recurring | Interest rate caps |  |  |
Derivative assets: |  |  |
Interest rate caps | 346,000 | 56,000 |
Fair Value, Measurements, Recurring | Options |  |  |
Derivative assets: |  |  |
Interest rate caps | 3,184,000 | 0 |
Fair Value, Measurements, Recurring | Interest rate swaps |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 | $ 0
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | U.S. Treasury futures |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Credit default swaps |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures |  |  |
Derivative liabilities |  |  |
Variation Margin | 29,000,000 | 45,000,000 |
Fair Value, Measurements, Recurring | Interest Rate Swaps, Credit Default Swaps, U.S. Treasury Futures | Central Clearing House |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 39,300,000 | 19,900,000 |
Derivative assets | 10,300,000 | 64,900,000 |
Fair Value, Measurements, Recurring | Residential loans |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 445,562,000 | 632,266,000 |
Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 959,250,000 | 965,672,000 |
Liabilities carried at fair value |  |  |
Consolidated SLST | 805,273,000 | 811,591,000 |
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 2,508,456,000 | 2,243,800,000 |
Fair Value, Measurements, Recurring | Residential loan securitizations |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 1,554,353,000 | 1,253,332,000 |
Fair Value, Measurements, Recurring | Agency RMBS |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 4,558,720,000 | 3,136,812,000 |
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 63,787,000 | 69,687,000 |
Fair Value, Measurements, Recurring | U.S. Treasury securities |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 24,305,000 | 622,045,000 |
Fair Value, Measurements, Recurring | Multi-family loans |  |  |
Assets carried at fair value |  |  |
Multi-family loans | 87,222,000 | 86,192,000 |
Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 69,515,000 | 70,757,000 |
Fair Value, Measurements, Recurring | Mortgage servicing rights |  |  |
Derivative assets: |  |  |
Mortgage servicing rights | 20,297,000 | 21,003,000 |
Level 1 | Fair Value, Measurements, Recurring |  |  |
Assets carried at fair value |  |  |
Equity investments | 0 | 0 |
Derivative assets: |  |  |
Assets of disposal group held for sale | 0 | 0 |
Total | 0 | 0 |
Derivative liabilities |  |  |
Total | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Senior unsecured notes |  |  |
Liabilities carried at fair value |  |  |
Senior unsecured notes | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Interest rate caps |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Options |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | U.S. Treasury futures |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Credit default swaps |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 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 | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 0 | 0 |
Liabilities carried at fair value |  |  |
Consolidated SLST | 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 | Residential loan securitizations |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 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 | U.S. Treasury securities |  |  |
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 | Non-Agency RMBS re-securitization |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Mortgage servicing rights |  |  |
Derivative assets: |  |  |
Mortgage servicing rights | 0 | 0 |
Level 2 | Fair Value, Measurements, Recurring |  |  |
Assets carried at fair value |  |  |
Equity investments | 0 | 0 |
Derivative assets: |  |  |
Assets of disposal group held for sale | 222,000 | 67,000 |
Total | 4,650,564,000 | 3,828,667,000 |
Derivative liabilities |  |  |
Total | 1,763,629,000 | 1,384,399,000 |
Derivative assets | 3,530,000 | 56,000 |
Level 2 | Fair Value, Measurements, Recurring | Senior unsecured notes |  |  |
Liabilities carried at fair value |  |  |
Senior unsecured notes | 139,761,000 | 60,310,000 |
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps |  |  |
Derivative assets: |  |  |
Interest rate caps | 346,000 | 56,000 |
Level 2 | Fair Value, Measurements, Recurring | Options |  |  |
Derivative assets: |  |  |
Interest rate caps | 3,184,000 | 0 |
Level 2 | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury futures |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 2 | Fair Value, Measurements, Recurring | Credit default swaps |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 2 | Fair Value, Measurements, Recurring | Derivative Asset |  |  |
Derivative assets: |  |  |
Assets of disposal group held for sale | 200,000 | 100,000 |
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 | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 0 | 0 |
Liabilities carried at fair value |  |  |
Consolidated SLST | 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 | Residential loan securitizations |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 1,554,353,000 | 1,253,332,000 |
Level 2 | Fair Value, Measurements, Recurring | Agency RMBS |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 4,558,720,000 | 3,136,812,000 |
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 63,787,000 | 69,687,000 |
Level 2 | Fair Value, Measurements, Recurring | U.S. Treasury securities |  |  |
Assets carried at fair value |  |  |
Investment securities available for sale: | 24,305,000 | 622,045,000 |
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 re-securitization |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 69,515,000 | 70,757,000 |
Level 2 | Fair Value, Measurements, Recurring | Mortgage servicing rights |  |  |
Derivative assets: |  |  |
Mortgage servicing rights | 0 | 0 |
Level 3 | Mortgage servicing rights |  |  |
Derivative assets: |  |  |
Mortgage servicing rights | 20,297,000 |  |
Level 3 | Fair Value, Measurements, Recurring |  |  |
Assets carried at fair value |  |  |
Equity investments | 93,999,000 | 113,492,000 |
Derivative assets: |  |  |
Assets of disposal group held for sale | 0 | 0 |
Total | 4,114,786,000 | 4,062,425,000 |
Derivative liabilities |  |  |
Total | 805,273,000 | 811,591,000 |
Level 3 | Fair Value, Measurements, Recurring | Senior unsecured notes |  |  |
Liabilities carried at fair value |  |  |
Senior unsecured notes | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | Interest rate caps |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | Options |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | Interest rate swaps |  |  |
Derivative assets: |  |  |
Interest rate caps | 0 | 0 |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | U.S. Treasury futures |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | Credit default swaps |  |  |
Derivative liabilities |  |  |
Derivative liabilities | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | Residential loans |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 445,562,000 | 632,266,000 |
Level 3 | Fair Value, Measurements, Recurring | Consolidated SLST | Consolidated SLST | VIE, Primary Beneficiary |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 959,250,000 | 965,672,000 |
Liabilities carried at fair value |  |  |
Consolidated SLST | 805,273,000 | 811,591,000 |
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |  |
Assets carried at fair value |  |  |
Residential loans, at fair value | 2,508,456,000 | 2,243,800,000 |
Level 3 | Fair Value, Measurements, Recurring | Residential loan securitizations |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 0 | 0 |
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 | U.S. Treasury securities |  |  |
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 | 87,222,000 | 86,192,000 |
Level 3 | Fair Value, Measurements, Recurring | Non-Agency RMBS re-securitization |  |  |
Liabilities carried at fair value |  |  |
Consolidated SLST | 0 | 0 |
Level 3 | Fair Value, Measurements, Recurring | Mortgage servicing rights |  |  |
Derivative assets: |  |  |
Mortgage servicing rights | $ 20,297,000 | $ 21,003,000 |

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