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Consolidated K-Series and Consolidated SLST - Narrative (Details) $ in Thousands	Dec. 31, 2019 USD ($) securitization	Dec. 31, 2018 USD ($) securitization	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Variable Interest Entity [Line Items]
Carrying Value	$ 20,780,548	$ 12,707,625	$ 10,157,126	$ 7,565,459
Principal Amount of Loans Subject to Delinquent Principal or Interest	224,706
Residential mortgage loans held in securitization trust, at fair value | First mortgage loans
Variable Interest Entity [Line Items]
Carrying Value	1,328,886
Greater than 90 days past
Variable Interest Entity [Line Items]
Carrying Value	106,199	60,117
Principal Amount of Loans Subject to Delinquent Principal or Interest	122,918	75,167
Greater than 90 days past | Residential mortgage loans held in securitization trust, at fair value | First mortgage loans
Variable Interest Entity [Line Items]
Principal Amount of Loans Subject to Delinquent Principal or Interest	50,741
Multi-family loans held in securitization trusts
Variable Interest Entity [Line Items]
Carrying Value	16,800,000	11,500,000
Multi-Family CDOs
Variable Interest Entity [Line Items]
Carrying Value	$ 16,800,000	$ 11,500,000
Weighted average interest rate (as a percent)	3.85%	3.96%
Consolidated K-Series
Variable Interest Entity [Line Items]
K-series net carrying value	$ 1,100,000	$ 657,600
Consolidated SLST
Variable Interest Entity [Line Items]
Consolidated SLST, carrying value	$ 276,800
Consolidated SLST | Multi-Family CDOs
Variable Interest Entity [Line Items]
Weighted average interest rate (as a percent)	3.53%
VIE, Primary Beneficiary | Multi-family loans held in securitization trusts
Variable Interest Entity [Line Items]
Carrying Value	$ 1,300,000
Freddie Mac Multi-family Loan K-Series | Consolidated K-Series
Variable Interest Entity [Line Items]
Number of securitizations | securitization	14	9
Consolidated SLST | VIE, Primary Beneficiary | Multi-Family CDOs
Variable Interest Entity [Line Items]
Carrying Value	$ 1,300,000

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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=6589523&loc=d3e617274-123014

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+ 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=6589523&loc=d3e617274-123014

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