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Segment Information - Supplemental Information by Segment (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Real estate securities	[1]	$ 1,543,152	$ 1,452,494
Other investments	[1]	414,198	438,518
Goodwill and intangible assets	[1]	52,895	0
Total Assets	[1]	12,193,359	11,937,406
Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		7,274,301	7,254,742
Business purpose residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		160,612	141,258
Multifamily loans
Segment Reporting Information [Line Items]
Loans, at fair value		2,175,899	2,144,598
Operating Segments | Investment Portfolio
Segment Reporting Information [Line Items]
Real estate securities		1,543,152	1,452,494
Other investments		411,853	427,764
Goodwill and intangible assets		0
Total Assets		10,444,279	10,093,993
Operating Segments | Investment Portfolio | Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		5,988,583	5,685,983
Operating Segments | Investment Portfolio | Business purpose residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		103,916	112,798
Operating Segments | Investment Portfolio | Multifamily loans
Segment Reporting Information [Line Items]
Loans, at fair value		2,175,899	2,144,598
Operating Segments | Mortgage Banking
Segment Reporting Information [Line Items]
Real estate securities		0	0
Other investments		2,345	0
Goodwill and intangible assets		52,895
Total Assets		942,596	1,103,090
Operating Segments | Mortgage Banking | Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		797,073	1,048,801
Operating Segments | Mortgage Banking | Business purpose residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		56,696	28,460
Operating Segments | Mortgage Banking | Multifamily loans
Segment Reporting Information [Line Items]
Loans, at fair value		0	0
Corporate/Other
Segment Reporting Information [Line Items]
Real estate securities		0	0
Other investments		0	10,754
Goodwill and intangible assets		0
Total Assets		806,484	740,323
Corporate/Other | Residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		488,645	519,958
Corporate/Other | Business purpose residential loans
Segment Reporting Information [Line Items]
Loans, at fair value		0	0
Corporate/Other | Multifamily loans
Segment Reporting Information [Line Items]
Loans, at fair value		$ 0	$ 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 March 31, 2019 and December 31, 2018, assets of consolidated VIEs totaled $6,585,881 and $6,331,191, respectively. At March 31, 2019 and December 31, 2018, liabilities of consolidated VIEs totaled $5,925,677 and $5,709,807, respectively. See Note 4 for further discussion.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale.

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