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Segment Information - Supplemental Information by Segment (Detail) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Residential loans		$ 4,036,674	$ 3,398,573
Commercial loans		468,157	566,927
Real estate securities	[1]	1,085,224	1,379,230
Mortgage servicing rights		162,726	139,293	[1]
Total assets	[1]	6,269,026	5,918,966
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Residential loans		1,506,151	1,342,519
Commercial loans		0	0
Real estate securities		0	93,802
Mortgage servicing rights		0	0
Total assets		1,563,306	1,468,856
Operating Segments | Residential Investments
Segment Reporting Information [Line Items]
Residential loans		1,360,277	581,668
Commercial loans		0	0
Real estate securities		1,085,224	1,285,428
Mortgage servicing rights		162,726	139,293
Total assets		2,723,955	2,057,256
Operating Segments | Commercial Mortgage Banking and Investments
Segment Reporting Information [Line Items]
Residential loans		0	0
Commercial loans		468,157	566,927
Real estate securities		0	0
Mortgage servicing rights		0	0
Total assets		475,924	575,943
Corporate/Other
Segment Reporting Information [Line Items]
Residential loans		1,170,246	1,474,386
Commercial loans		0	0
Real estate securities		0	0
Mortgage servicing rights		0	0
Total assets		$ 1,505,841	$ 1,816,911
[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 September 30, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,539,350 and $1,900,208, respectively. At September 30, 2015 and December 31, 2014, liabilities of consolidated VIEs totaled $1,179,884 and $1,546,490, respectively. See Note 4 for further discussion.

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