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Residential Loans, at Fair Value - Schedule of Residential Loans at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	$ 3,190,170	$ 3,025,740
Premium/(Discount)	(83,076)	(82,428)
Unrealized gains	99,188	105,854
Carrying Value	3,206,282	3,049,166
Consolidated SLST | VIE, Primary Beneficiary
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,203,223	1,231,669
Premium/(Discount)	(152)	1,337
Unrealized gains	8,437	33,779
Carrying Value	1,211,508	1,266,785
Residential loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	1,317,342	1,097,528
Premium/(Discount)	(42,722)	(42,259)
Unrealized gains	42,087	35,661
Carrying Value	1,316,707	1,090,930
Residential loans held in securitization trusts
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal	669,605	696,543
Premium/(Discount)	(40,202)	(41,506)
Unrealized gains	48,664	36,414
Carrying Value	$ 678,067	$ 691,451

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Residential Mortgage Loans, Accumulated Gross Unrealized Gain(loss), before Tax

+ References

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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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of 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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29(Column G))
-URI http://asc.fasb.org/extlink&oid=120402547&loc=d3e617274-123014

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