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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, 2022 | Mar. 31, 2021
Collateralized Debt Obligations | Consolidated SLST | VIE, Primary Beneficiary |  |
Liabilities |  |
Unrealized gains (losses) | $ 51,366 | $ 34,568
Residential loans | Consolidated SLST | VIE, Primary Beneficiary |  |
Assets |  |
Unrealized gains (losses) | (66,645) | (25,343)
Residential loans | Residential loans |  |
Assets |  |
Unrealized gains (losses) | (25,440) | 7,354
Residential loans | Residential Loans Held in Securitization Trusts |  |
Assets |  |
Unrealized gains (losses) | (32,566) | 15,605
Multi-family loans | Preferred Equity and Mezzanine Loan Investments |  |
Assets |  |
Unrealized gains (losses) | 291 | 177
Multi-family loans | Equity investments |  |
Assets |  |
Unrealized gains (losses) | $ 1,115 | $ 123

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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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