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Fair Value of Financial Instruments - Schedule of Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - Level 3 - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ 16,810 | $ (1,306) | $ 29,705 | $ (800)
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized gains (losses), net | Unrealized gains (losses), net | Unrealized gains (losses), net | Unrealized gains (losses), net
Residential loans |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ 904 | $ (1,912) | $ 7,605 | $ (10,592)
Residential Loans Held in Securitization Trusts |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 8,503 | (6,359) | 33,297 | (7,156)
Multi-Family Loans |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 56 | (16) | 360 | (4,794)
Equity investments |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (2,740) | (419) | (3,876) | (6,581)
Equity investments | Assets of disposal group held for sale |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (611) | 0 | (838) | 0
Mortgage servicing rights |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (848) | 0 | (1,554) | 0
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Liabilities |  |  |  |
Unrealized gains (losses) | $ (11,289) | $ 1,848 | $ (20,920) | $ 1,306
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized gains (losses), net | Unrealized gains (losses), net | Unrealized gains (losses), net | Unrealized gains (losses), net

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