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Segment Information - Supplemental Information by Segment (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Real estate securities	[1]	$ 1,470,084	$ 1,476,510
Total assets	[1]	9,139,635	7,039,822
Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		5,922,259	5,115,210
Business purpose loans, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		115,620
Multifamily loans, held-for-investment, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		942,165
Operating Segments | Investment Portfolio
Segment Reporting Information [Line Items]
Real estate securities		1,470,084	1,476,510
Total assets		7,436,674	4,743,873
Operating Segments | Investment Portfolio | Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		4,501,857	3,054,448
Operating Segments | Investment Portfolio | Business purpose loans, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		95,515
Operating Segments | Investment Portfolio | Multifamily loans, held-for-investment, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		942,165
Operating Segments | Mortgage Banking
Segment Reporting Information [Line Items]
Real estate securities		0	0
Total assets		909,926	1,453,069
Operating Segments | Mortgage Banking | Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		866,444	1,427,945
Operating Segments | Mortgage Banking | Business purpose loans, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		20,105
Operating Segments | Mortgage Banking | Multifamily loans, held-for-investment, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		0
Corporate/Other
Segment Reporting Information [Line Items]
Real estate securities		0	0
Total assets		793,035	842,880
Corporate/Other | Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		553,958	$ 632,817
Corporate/Other | Business purpose loans, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		0
Corporate/Other | Multifamily loans, held-for-investment, at fair value
Segment Reporting Information [Line Items]
Loans, at fair value		$ 0
[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, 2018 and December 31, 2017, assets of consolidated VIEs totaled $3,693,140 and $1,259,774, respectively. At September 30, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $3,417,835 and $1,167,157, respectively. See Note 4 for further discussion.

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