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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Assets carried at fair value |  |
Investment securities available for sale: | $ 23,936 | $ 23,645
Derivative assets: |  |
Interest rate caps | 39,760 | 2,473
Derivative liabilities |  |
Derivative assets | 2,031 | 2,473
Variation Margin | 0 |
Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 2,031 |
Interest rate swaps |  |
Derivative assets: |  |
Interest rate caps | 37,729 | 2,473
Derivative liabilities |  |
Variation Margin | 0 |
Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 155,583 | 179,746
Assets of disposal group held for sale | 19,697 | 38,428
Total | 4,871,856 | 3,932,820
Derivative liabilities |  |
Total | 584,741 | 634,495
Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 2,031 | 2,473
Fair Value, Measurements, Recurring | Interest rate swaps |  |
Derivative liabilities |  |
Derivative liability | 0 | 0
Variation Margin | 34,700 |
Fair Value, Measurements, Recurring | Interest rate swaps | Central Clearing House |  |
Derivative liabilities |  |
Derivative liability | (3,000) |
Derivative assets | 37,700 |
Fair Value, Measurements, Recurring | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 736,939 | 1,081,384
Fair Value, Measurements, Recurring | Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets carried at fair value |  |
Residential loans, at fair value | 742,604 | 827,582
Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,514,352 | 1,616,114
Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 98,435 | 87,534
Fair Value, Measurements, Recurring | Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 1,535,004 | 0
Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 61,563 | 68,570
Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 5,648 | 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 | 584,741 | 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 | 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: | 1,602,215 | 99,559
Derivative liabilities |  |
Derivative assets | 2,031 | 2,473
Level 2 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 0 | 0
Assets of disposal group held for sale | 14,624 | 29,418
Total | 1,618,870 | 131,450
Derivative liabilities |  |
Total | 0 | 0
Level 2 | Fair Value, Measurements, Recurring | Interest rate caps |  |
Derivative assets: |  |
Interest rate caps | 2,031 | 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 | 14,600 | 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: |  | 0
Level 2 | Fair Value, Measurements, Recurring | Non-Agency RMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 61,563 | 68,570
Level 2 | Fair Value, Measurements, Recurring | CMBS |  |
Assets carried at fair value |  |
Investment securities available for sale: | 5,648 | 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 | 155,583 | 179,746
Level 3 | Fair Value, Measurements, Recurring |  |
Assets carried at fair value |  |
Fair Value | 155,583 | 179,746
Assets of disposal group held for sale | 5,073 | 9,010
Total | 3,252,986 | 3,801,370
Derivative liabilities |  |
Total | 584,741 | 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 | Residential loans |  |
Assets carried at fair value |  |
Residential loans, at fair value | 736,939 | 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 | 742,604 | 827,582
Level 3 | Fair Value, Measurements, Recurring | Residential loans held in securitization trusts |  |
Assets carried at fair value |  |
Residential loans, at fair value | 1,514,352 | 1,616,114
Level 3 | Fair Value, Measurements, Recurring | Multi-family loans |  |
Assets carried at fair value |  |
Multi-family loans | 98,435 | 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 | 584,741 | 634,495
Level 3 | Fair Value, Measurements, Recurring | Equity investments |  |
Assets carried at fair value |  |
Assets of disposal group held for sale | $ 5,100 | $ 9,000

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