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Fair Value of Financial Instruments - 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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Liabilities |  |  |  |
Unrealized gains (losses) | $ 3,322 | $ (70,956) | $ 37,890 | $ (48,990)
Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 6,471 | 75,052,000 | (18,872) | (13,049)
Residential loans | Residential loans |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 3,752 | 39,991,000 | 12,192 | (36,303,000)
Residential loans | Residential Loans Held in Securitization Trusts |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 6,030 | 59,000 | 18,611 | (1,641)
Multi-family loans | Preferred Equity and Mezzanine Loan Investments |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | 460 | (127,000) | 665 | (5,686)
Multi-family loans | Equity investments |  |  |  |
Assets |  |  |  |
Unrealized gains (losses) | $ 805 | $ (1,108,000) | $ 927 | $ (5,130)

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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