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Basis of Presentation - Acquisition of 5 Arches & CoreVest (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 15, 2019 | Mar. 01, 2019 | Mar. 31, 2019 | May 31, 2018 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition-related equity compensation expense |  |  |  |  |  |  | $ 1,010 | $ 0 | $ 0
Remeasurement gain |  |  |  |  |  |  | 2,441 | 0 |
Acquisition related costs |  |  |  |  |  |  | 3,217 | 0 | $ 0
Goodwill | [1] |  |  |  |  |  | 88,675 | 0 |
Contingent consideration |  |  |  |  |  |  | $ 28,484 | 0 |
5 Arches, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Payments to acquire equity method investment |  |  |  |  | $ 10,000 |  |  |  |
Option to purchase additional equity, term |  |  |  |  | 1 year |  | 1 year |  |
5 Arches, LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percent acquired |  |  |  | 80.00% |  |  |  |  |
Minority interest, percentage |  |  |  |  | 20.00% |  |  |  |
Cash |  |  | $ 12,575 |  |  |  |  |  |
Contingent consideration maximum amount |  |  | 27,000 |  | $ 29,000 |  |  |  |
Contingent consideration performance term |  |  |  |  | 2 years |  |  |  |
Remeasurement gain |  |  |  |  |  | $ 2,000 |  |  |
Intangible assets |  |  | 24,800 |  |  |  |  |  |
Goodwill |  |  | 28,747 |  |  |  | $ 28,747 | 0 |
Contingent consideration |  |  | 24,621 |  |  |  | 28,000 |  |
Contingent consideration expense |  |  |  |  |  |  | 3,000 |  |
Net interest income |  |  |  |  |  |  | 100 |  |
Non-interest income |  |  |  |  |  |  | 19,000 |  |
Net income |  |  |  |  |  |  | 3,000 |  |
Intangible assets amortization expense |  |  |  |  |  |  | 6,000 |  |
CoreVest LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash |  | $ 482,311 |  |  |  |  |  |  |
Contingent consideration performance term |  | 2 years |  |  |  |  |  |  |
Total consideration |  | $ 492,000 |  |  |  |  |  |  |
Restricted stock awards |  | 10,000 |  |  |  |  |  |  |
Acquisition-related equity compensation expense |  | 10,000 |  |  |  |  |  |  |
Intangible assets |  | 56,500 | 57,000 |  |  |  |  |  |
Goodwill |  | 59,928 |  |  |  |  | 59,928 | $ 0 |
Contingent consideration |  | $ 0 |  |  |  |  |  |  |
Net interest income |  |  |  |  |  |  | 11,000 |  |
Non-interest income |  |  |  |  |  |  | 19,000 |  |
Net income |  |  |  |  |  |  | 22,000 |  |
Intangible assets amortization expense |  |  |  |  |  |  | 2,000 |  |
5 Arches LLC And CoreVest |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  | 2,000 |  |
Goodwill |  |  |  |  |  |  | $ 89,000 |  |
Goodwill deductible for tax purposes |  |  | $ 75,000 |  |  |  |  |  |
[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, 2019 and December 31, 2018, assets of consolidated VIEs totaled $11,931,869 and $6,331,191, respectively. At December 31, 2019 and December 31, 2018, liabilities of consolidated VIEs totaled $10,717,072 and $5,709,807, respectively. See Note 4 for further discussion.

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