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Other Investments - Summary of Other Investments (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Investment [Line Items]
Servicing asset, fair value		$ 281,762	$ 286,778
Loan held-for-investment, amount		0	39,703
Other Investments	[1]	414,198	438,518
5 Arches, LLC
Investment [Line Items]
Carrying amount of equity method investments		0	10,754
Mortgage servicing rights
Investment [Line Items]
Servicing asset, fair value		55,284	60,281	$ 66,496	$ 63,598
Multifamily loans, held-for-investment, at fair value
Investment [Line Items]
Loan held-for-investment, amount		22,416	0
Other notes receivable
Investment [Line Items]
Loan held-for-investment, amount		3,586	0
Residential Loans
Investment [Line Items]
Servicing asset, fair value		303,920	300,468
Excess MSRs
Investment [Line Items]
Servicing asset, fair value		$ 28,992	$ 27,312
[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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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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