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Schedule IV - Mortgage Loans On Real Estate (Details)	12 Months Ended
	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	198	669
Carrying Amount	$ 8,877,626,000	$ 15,630,117,000	$ 9,540,598,000	$ 5,115,210,000
Principal Amount Subject to Delinquent Principal or Interest	1,882,000	$ 747,000
Residential loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	4,072,410,000
Principal Amount Subject to Delinquent Principal or Interest	481,272,000
Residential loans, held-for-sale, at fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	176,641,000
Principal Amount Subject to Delinquent Principal or Interest	$ 1,882,000
Residential loans, held-for-sale, at fair value | Hybrid ARM loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	2	115
Carrying Amount	$ 1,014,000
Principal Amount Subject to Delinquent Principal or Interest	$ 0	$ 0
Residential loans, held-for-sale, at fair value | Hybrid ARM loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
Residential loans, held-for-sale, at fair value | Hybrid ARM loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.38%
Residential loans, held-for-sale, at fair value | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	196	554
Carrying Amount	$ 175,627,000
Principal Amount Subject to Delinquent Principal or Interest	$ 1,882,000	$ 747,000
Residential loans, held-for-sale, at fair value | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.38%
Residential loans, held-for-sale, at fair value | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.50%
Single-family rental loans, held-for-sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 245,394,000
Principal Amount Subject to Delinquent Principal or Interest	$ 7,127,000
Single-family rental loans, held-for-sale | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	65
Carrying Amount	$ 245,394,000
Principal Amount Subject to Delinquent Principal or Interest	$ 7,127,000
Single-family rental loans, held-for-sale | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.82%
Single-family rental loans, held-for-sale | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.75%
Single-family rental loans held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 3,249,194,000
Principal Amount Subject to Delinquent Principal or Interest	61,440,000
Bridge loans held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	641,765,000
Principal Amount Subject to Delinquent Principal or Interest	39,415,000
Real estate loans, federal income tax basis	$ 654,000,000
Bridge loans held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1,725
Carrying Amount	$ 641,765,000
Principal Amount Subject to Delinquent Principal or Interest	$ 39,415,000
Bridge loans held-for-investment | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.04%
Bridge loans held-for-investment | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	13.00%
Multifamily loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 492,221,000
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Multifamily loans, held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	28
Carrying Amount	$ 492,221,000
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Multifamily loans, held-for-investment | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.25%
Multifamily loans, held-for-investment | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.25%
Redwood | Residential loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		2,940
Principal Amount Subject to Delinquent Principal or Interest		$ 1,585,000
Redwood | Residential loans, held-for-investment | Hybrid ARM loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		299
Principal Amount Subject to Delinquent Principal or Interest		$ 971,000
Redwood | Residential loans, held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan		2,641
Principal Amount Subject to Delinquent Principal or Interest		$ 614,000
Legacy Sequoia
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Real estate loans, federal income tax basis	$ 0
Legacy Sequoia | Residential loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1,908	2,198
Principal Amount Subject to Delinquent Principal or Interest	$ 17,285,000	$ 9,803,000
Legacy Sequoia | Residential loans, held-for-investment | ARM loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1,899	2,186
Carrying Amount	$ 282,551,000
Principal Amount Subject to Delinquent Principal or Interest	$ 17,285,000	$ 9,803,000
Legacy Sequoia | Residential loans, held-for-investment | ARM loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	0.25%
Legacy Sequoia | Residential loans, held-for-investment | ARM loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	5.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	9	12
Carrying Amount	$ 3,384,000
Principal Amount Subject to Delinquent Principal or Interest	$ 0	$ 0
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.63%
Legacy Sequoia | Residential loans, held-for-investment | Hybrid ARM loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.00%
Sequoia Choice | Residential loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	2,177
Principal Amount Subject to Delinquent Principal or Interest	$ 74,742,000
Sequoia Choice | Residential loans, held-for-investment | Hybrid ARM loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	54
Carrying Amount	$ 43,003,000
Principal Amount Subject to Delinquent Principal or Interest	$ 2,415,000
Sequoia Choice | Residential loans, held-for-investment | Hybrid ARM loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.13%
Sequoia Choice | Residential loans, held-for-investment | Hybrid ARM loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	2,123	3,156
Carrying Amount	$ 1,522,319,000
Principal Amount Subject to Delinquent Principal or Interest	$ 72,327,000	$ 6,755,000
Sequoia Choice | Residential loans, held-for-investment | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.75%
Sequoia Choice | Residential loans, held-for-investment | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	6.75%
Freddie Mac SLST
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Real estate loans, federal income tax basis	$ 0
Freddie Mac SLST | Residential loans, held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	13,605	14,502
Carrying Amount	$ 2,221,153,000
Principal Amount Subject to Delinquent Principal or Interest	$ 389,245,000	$ 135,175,000
Freddie Mac SLST | Residential loans, held-for-investment | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	2.00%
Freddie Mac SLST | Residential loans, held-for-investment | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	11.00%
CAFL | Single-family rental loans held-for-investment | Fixed loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1,094
Carrying Amount	$ 3,249,194,000
Principal Amount Subject to Delinquent Principal or Interest	$ 61,440,000
CAFL | Single-family rental loans held-for-investment | Fixed loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.93%
CAFL | Single-family rental loans held-for-investment | Fixed loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.57%

X

- Definition

Amount of federal income tax basis 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 8
-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(Footnote 8))
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+ References

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-Publisher SEC
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ References

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-Publisher SEC
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