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Residential Loans, at Fair Value - Differences Between Fair Value and Aggregate Unpaid Principal (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | $ 3,273,807 | $ 3,049,166
Residential loans |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | 1,325,219 | 1,090,930
Residential loans | Greater than 90 days past due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | 102,688 | 149,444
Unpaid Principal Balance | 115,169 | 169,553
Residential loans | Less than 90 days past due |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |
Fair Value | 16,969 | 16,057
Unpaid Principal Balance | $ 17,241 | $ 17,748

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- Definition Amount of principal due on delinquent 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 H -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 H)) -URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014 + Details
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