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Segment Information - Supplemental Information by Segment (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Real estate securities	[1]	$ 1,453,936	$ 1,476,510
Total assets	[1]	7,512,551	7,039,822
Residential loans
Segment Reporting Information [Line Items]
Residential loans		5,491,170	5,115,210
Operating Segments | Investment Portfolio
Segment Reporting Information [Line Items]
Real estate securities		1,453,936	1,476,510
Total assets		5,591,778	4,743,873
Operating Segments | Investment Portfolio | Residential loans
Segment Reporting Information [Line Items]
Residential loans		3,794,481	3,054,448
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Real estate securities		0	0
Total assets		1,124,300	1,453,069
Operating Segments | Residential Mortgage Banking | Residential loans
Segment Reporting Information [Line Items]
Residential loans		1,104,660	1,427,945
Corporate/Other
Segment Reporting Information [Line Items]
Real estate securities		0	0
Total assets		796,473	842,880
Corporate/Other | Residential loans
Segment Reporting Information [Line Items]
Residential loans		$ 592,029	$ 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 June 30, 2018 and December 31, 2017, assets of consolidated VIEs totaled $2,082,771 and $1,259,774, respectively. At June 30, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $1,935,299 and $1,167,157, respectively. See Note 4 for further discussion.

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