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Residential Loans - Summary of Classifications and Carrying Value of Residential Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment	[1]	$ 1,048,801	$ 1,427,945
Residential Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,049,000	1,430,000
Residential loans, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		100	1,000
Legacy Sequoia | Residential Loans Held For Investment at Fair Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		520,000	633,000
Sequoia Choice | Residential Loans Held For Investment at Fair Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		2,080,000	620,000
Freddie Mac SLST | Residential Loans Held For Investment at Fair Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,220,000
Residential Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		7,254,742	5,115,210
Residential Loans | Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,048,801	1,427,945
Residential Loans | Residential Loans | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,048,690	1,427,052
Residential Loans | Residential loans, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		111	893
Residential Loans | Residential Loans Held For Investment at Fair Value | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		6,205,941	3,687,265
Residential Loans | Legacy Sequoia
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		519,958	632,817
Residential Loans | Legacy Sequoia | Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Legacy Sequoia | Residential Loans | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Legacy Sequoia | Residential loans, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Legacy Sequoia | Residential Loans Held For Investment at Fair Value | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		519,958	632,817
Residential Loans | Sequoia Choice
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		2,079,382	620,062
Residential Loans | Sequoia Choice | Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Sequoia Choice | Residential Loans | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Sequoia Choice | Residential loans, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Sequoia Choice | Residential Loans Held For Investment at Fair Value | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		2,079,382	620,062
Residential Loans | Freddie Mac SLST
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,222,669	0
Residential Loans | Freddie Mac SLST | Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Freddie Mac SLST | Residential Loans | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Freddie Mac SLST | Residential loans, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		0	0
Residential Loans | Freddie Mac SLST | Residential Loans Held For Investment at Fair Value | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,222,669	0
Redwood Trust Inc. | Residential Loans Held For Investment at Fair Value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment			2,430,000
Redwood Trust Inc. | Residential Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		3,432,733	3,862,331
Redwood Trust Inc. | Residential Loans | Residential Loans Held For Sale
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,048,801	1,427,945
Redwood Trust Inc. | Residential Loans | Residential Loans | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		1,048,690	1,427,052
Redwood Trust Inc. | Residential Loans | Residential loans, at lower of cost or fair value
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		111	893
Redwood Trust Inc. | Residential Loans | Residential Loans Held For Investment at Fair Value | Jumbo Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loan market valuation adjustment		$ 2,383,932	$ 2,434,386
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At December 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $6,331,191 and $1,259,774, respectively. At December 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $5,709,807 and $1,167,157, respectively. See Note 4 for further discussion.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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