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Residential Loans, at Fair Value - Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal | $ 3,529,804 |  |  |
(Discount)/premium | (84,265) |  |  |
Unrealized gains | 130,062 |  |  |
Carrying Value | 3,575,601 | $ 3,049,166 | $ 20,780,548 | $ 12,707,625
Consolidated SLST | VIE, Primary Beneficiary |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal | 1,071,228 | 1,231,669 |  |
(Discount)/premium | (2,998) | 1,337 |  |
Unrealized gains | 2,652 | 33,779 |  |
Carrying Value | 1,070,882 | 1,266,785 |  |
Residential Loans at Fair Value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal |  | 3,025,740 |  |
(Discount)/premium |  | (82,428) |  |
Unrealized gains |  | 105,854 |  |
Carrying Value |  | 3,049,166 |  |
Residential loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal | 1,682,138 | 1,097,528 |  |
(Discount)/premium | (44,256) | (42,259) |  |
Unrealized gains | 65,408 | 35,661 |  |
Carrying Value | 1,703,290 | 1,090,930 |  |
Residential mortgage loans held in securitization trust, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal | 776,438 | 696,543 |  |
(Discount)/premium | (37,011) | (41,506) |  |
Unrealized gains | 62,002 | 36,414 |  |
Carrying Value | $ 801,429 | $ 691,451 |  |

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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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