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Schedule IV - Mortgage Loans On Real Estate (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	1,486	2,013
Carrying Amount	$ 9,540,598	$ 5,115,210	$ 3,890,751	$ 4,331,450
Principal Amount Subject to Delinquent Principal or Interest	747	$ 459
Residential loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	6,205,941
Principal Amount Subject to Delinquent Principal or Interest	67,612
Real estate loans, federal income tax basis	2,420,000
Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	1,048,801
Principal Amount Subject to Delinquent Principal or Interest	$ 747
Residential Loans Held For Sale | Hybrid ARM Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	108	93
Carrying Amount	$ 89,406
Principal Amount Subject to Delinquent Principal or Interest	$ 0	$ 0
Residential Loans Held For Sale | Hybrid ARM Loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	3.50%
Residential Loans Held For Sale | Hybrid ARM Loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	7.38%
Residential 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	1,376	1,917
Carrying Amount	$ 959,284
Principal Amount Subject to Delinquent Principal or Interest	$ 747	$ 459
Residential 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	3.13%
Residential 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	7.00%
Residential Loans Held For Sale | ARM Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of Loans | loan	2	3
Carrying Amount	$ 111
Principal Amount Subject to Delinquent Principal or Interest	$ 0	$ 0
Residential Loans Held For Sale | ARM Loans | Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.00%
Residential Loans Held For Sale | ARM Loans | Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Interest Rate	4.13%
Single-family rental 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	$ 28,460
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Single-family rental 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	11
Carrying Amount	$ 28,460
Principal Amount Subject to Delinquent Principal or Interest	$ 0
Single-family rental 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	5.62%
Single-family rental 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	7.47%
Residential bridge loans held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 112,798
Principal Amount Subject to Delinquent Principal or Interest	$ 12,134
Residential 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	157
Carrying Amount	$ 112,798
Principal Amount Subject to Delinquent Principal or Interest	$ 12,134
Residential 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	7.50%
Residential 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	12.00%
Multifamily loans, held-for-investment
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Carrying Amount	$ 2,144,598
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	162
Carrying Amount	$ 2,144,598
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	3.29%
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	4.73%
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	2,641	3,178
Principal Amount Subject to Delinquent Principal or Interest	$ 13,955	$ 25,457
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	21	33
Carrying Amount	$ 8,511
Principal Amount Subject to Delinquent Principal or Interest	$ 0	$ 641
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	5.00%
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	2,620	3,145
Carrying Amount	$ 511,447
Principal Amount Subject to Delinquent Principal or Interest	$ 13,955	$ 24,816
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	1.25%
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%
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	2,800	806
Carrying Amount	$ 2,079,382
Principal Amount Subject to Delinquent Principal or Interest	$ 1,905	$ 0
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	6.50%
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	7,900
Carrying Amount	$ 1,222,669
Principal Amount Subject to Delinquent Principal or Interest	$ 50,528
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	10.50%
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	3,296	3,292
Principal Amount Subject to Delinquent Principal or Interest	$ 1,224	$ 0
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	385	259
Carrying Amount	$ 309,747
Principal Amount Subject to Delinquent Principal or Interest	$ 0	$ 0
Redwood | 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%
Redwood | 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	6.38%
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	2,911	3,033
Carrying Amount	$ 2,074,185
Principal Amount Subject to Delinquent Principal or Interest	$ 1,224	$ 0
Redwood | 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%
Redwood | 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%

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))
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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Interest rate 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)
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-Section 12
-Paragraph Column B
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Footnote 3
-Subsection 29

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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+ 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
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-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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