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Segment Information - Supplemental Information by Segment (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Real estate securities	[1]	$ 1,357,720	$ 1,476,510
Mortgage servicing rights, at fair value	[1]	66,496	63,598
Total assets	[1]	6,999,573	7,039,822
Residential loans
Segment Reporting Information [Line Items]
Loan market valuation adjustment		5,145,740	5,115,210
Operating Segments | Investment Portfolio
Segment Reporting Information [Line Items]
Real estate securities		1,357,720	1,476,510
Mortgage servicing rights, at fair value		66,496	63,598
Total assets		5,012,235	4,743,873
Operating Segments | Investment Portfolio | Residential loans
Segment Reporting Information [Line Items]
Loan market valuation adjustment		3,389,404	3,054,448
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Real estate securities		0	0
Mortgage servicing rights, at fair value		0	0
Total assets		1,154,413	1,453,069
Operating Segments | Residential Mortgage Banking | Residential loans
Segment Reporting Information [Line Items]
Loan market valuation adjustment		1,130,185	1,427,945
Corporate/Other
Segment Reporting Information [Line Items]
Real estate securities		0	0
Mortgage servicing rights, at fair value		0	0
Total assets		832,925	842,880
Corporate/Other | Residential loans
Segment Reporting Information [Line Items]
Loan market valuation adjustment		$ 626,151	$ 632,817
[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 March 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $1,647,850 and $1,259,774, respectively. At March 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $1,546,066 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.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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