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Segment Information - Supplemental Information by Segment (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Residential loans		$ 4,040,138	$ 3,928,803
Commercial loans		325,063	402,647
Real estate securities	[1]	883,801	1,233,256
Mortgage servicing rights	[1]	110,046	191,976
Total assets	[1]	5,897,592	6,220,047
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Residential loans		882,380	1,115,738
Commercial loans		0	0
Real estate securities		0	197,007
Mortgage servicing rights		0	0
Total assets		918,746	1,347,492
Operating Segments | Residential Investments
Segment Reporting Information [Line Items]
Residential loans		2,277,561	1,791,195
Commercial loans		0	0
Real estate securities		835,681	1,028,171
Mortgage servicing rights		110,046	191,976
Total assets		3,448,727	3,140,604
Operating Segments | Commercial Mortgage Banking and Investments
Segment Reporting Information [Line Items]
Residential loans		0	0
Commercial loans		325,063	402,647
Real estate securities		48,120	8,078
Mortgage servicing rights		0	0
Total assets		375,576	415,716
Corporate/Other
Segment Reporting Information [Line Items]
Residential loans		880,197	1,021,870
Commercial loans		0	0
Real estate securities		0	0
Mortgage servicing rights		0	0
Total assets		$ 1,154,543	$ 1,316,235
[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, 2016 and December 31, 2015, assets of consolidated VIEs totaled $888,026 and $1,195,574, respectively. At June 30, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $860,256 and $1,050,861, respectively. See Note 4 for further discussion.

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