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Residential Loans, at Fair Value - Residential Loans at Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Consolidated SLST | VIE, Primary Beneficiary |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | $ 1,259,063 | $ 1,322,131
Premium/(Discount) | 2,628 | 6,455
Unrealized Gains/(Losses) | 28,314 | 300
Carrying Value | 1,290,005 | 1,328,886
Residential loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 1,207,391 | 1,464,984
Premium/(Discount) | (58,904) | (81,372)
Unrealized Gains/(Losses) | 28,811 | 46,142
Carrying Value | 1,177,298 | $ 1,429,754
Residential loans held in securitization trusts |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Principal | 371,826 |
Premium/(Discount) | (24,874) |
Unrealized Gains/(Losses) | 8,534 |
Carrying Value | $ 355,486 |

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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph Column F -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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