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Fair Value of Financial Instruments - Changes in Unrealized Gains (Losses) Included in Earnings for Level 3 Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Assets |  |  |  |
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized losses, net | Unrealized losses, net | Unrealized losses, net | Unrealized losses, net
Liabilities |  |  |  |
Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] | Unrealized losses, net | Unrealized losses, net | Unrealized losses, net | Unrealized losses, net
Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ (30,705) | $ (33,188) | $ (38,230) | $ (110,631)
Residential loans | Level 3 |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (8,986) | (57,296) | (12,927) | (90,749)
Residential Loans Held in Securitization Trusts | Level 3 |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (15,178) | (66,697) | 4,698 | (150,664)
Preferred Equity and Mezzanine Loan Investments | Level 3 |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (17) | (2,490) | 762 | (2,117)
Equity investments | Level 3 |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (1,105) | (6,387) | (5,027) | (4,581)
Equity investments in disposal group held for sale | Level 3 |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | (2,622) | (1,054) | (3,937) | (504)
Collateralized Debt Obligations | Level 3 | Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Liabilities |  |  |  |
Unrealized gains (losses) | $ 21,380 | $ 25,263 | $ 18,876 | $ 83,151

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- Definition Indicates line item in statement in which net income is reported that includes unrealized gain (loss) from asset measured at fair value using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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