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Segment Information - Supplemental Information by Segment (Detail) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Residential loans		$ 3,715,056	$ 3,928,803
Commercial loans		363,893	402,647
Real estate securities	[1]	919,927	1,233,256
Mortgage servicing rights		126,620	191,976	[1]
Total assets	[1]	5,726,880	6,220,047
Operating Segments | Residential Mortgage Banking
Segment Reporting Information [Line Items]
Residential loans		441,076	1,115,738
Commercial loans		0	0
Real estate securities		0	197,007
Mortgage servicing rights		0	0
Total assets		472,213	1,347,492
Operating Segments | Residential Investments
Segment Reporting Information [Line Items]
Residential loans		2,343,953	1,791,195
Commercial loans		0	0
Real estate securities		909,569	1,028,171
Mortgage servicing rights		126,620	191,976
Total assets		3,552,629	3,140,604
Operating Segments | Commercial Mortgage Banking and Investments
Segment Reporting Information [Line Items]
Residential loans		0	0
Commercial loans		363,893	402,647
Real estate securities		10,358	8,078
Mortgage servicing rights		0	0
Total assets		377,452	415,716
Corporate/Other
Segment Reporting Information [Line Items]
Residential loans		930,027	1,021,870
Commercial loans		0	0
Real estate securities		0	0
Mortgage servicing rights		0	0
Total assets		$ 1,324,586	$ 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 March 31, 2016 and December 31, 2015, assets of consolidated VIEs totaled $1,102,195 and $1,195,574, respectively. At March 31, 2016 and December 31, 2015, liabilities of consolidated VIEs totaled $959,464 and $1,050,861, respectively. See Note 4 for further discussion.

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