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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ 7,395 | $ 28,655 | $ 37,100 | $ 27,855
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized gains, net | Unrealized gains, net | Unrealized gains, net | Unrealized gains, net
Residential loans |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ 1,110 | $ 2,305 | $ (3,557) | $ (3,768)
Residential Loans Held in Securitization Trusts |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 16,774 | 42,170 | 50,064 | 34,918
Residential Loans Held for Sale |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 2,552 | 0 | 2,552 | 0
Multi-family loans |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 123 | 176 | 479 | (4,613)
Equity investments |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (2,860) | (1,097) | (2,368) | (7,677)
IRLCs |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 2,383 | 0 | 2,383 | 0
MSRs |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (1,019) | 0 | (2,573) | 0
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Liabilities |  |  |  |
Unrealized gains (losses) | $ (4,955) | $ (21,902) | $ (25,875) | $ (20,596)
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized gains, net | Unrealized gains, net | Unrealized gains, net | Unrealized gains, net

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