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Real Estate Securities - Fair Values of Real Estate Securities by Collateral Type and Entity (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Trading		$ 1,118,612	$ 968,844
Available-for-sale securities		333,882	507,666
Total Real Estate Securities	[1]	$ 1,452,494	$ 1,476,510
[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 December 31, 2018 and December 31, 2017, assets of consolidated VIEs totaled $6,331,191 and $1,259,774, respectively. At December 31, 2018 and December 31, 2017, liabilities of consolidated VIEs totaled $5,709,807 and $1,167,157, respectively. See Note 4 for further discussion.

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in marketable security.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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