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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
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Mar. 31, 2021 | Mar. 31, 2020
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities |  |
Unrealized gains (losses) | $ 34,568 | $ 21,966
Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets |  |
Unrealized gains (losses) | (25,343) | (88,100)
Residential loans | Residential loans |  |
Assets |  |
Unrealized gains (losses) | 7,354 | (76,295)
Residential loans | Residential Loans Held in Securitization Trusts |  |
Assets |  |
Unrealized gains (losses) | 15,605 | (1,700)
Multi-family loans | Preferred Equity and Mezzanine Loan Investments |  |
Assets |  |
Unrealized gains (losses) | 177 | (5,559)
Multi-family loans | Equity investments |  |
Assets |  |
Unrealized gains (losses) | $ 123 | $ (4,023)

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