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Residential Loans - Summary of Classifications and Carrying Value of Residential Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Residential Loans Held For Sale |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment | [1] | $ 1,427,945 | $ 835,399
Residential Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 1,430,000 | 830,000
Residential loans, at lower of cost or fair value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 1,000 | 1,000
Legacy Sequoia | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 633,000 | 792,000
Sequoia Choice | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 620,000 |
Redwood | Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  |  | 2,260,000
Residential Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 5,115,210 | 3,888,051
Residential Loans | Residential Loans Held For Sale |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 1,427,945 | 835,399
Residential Loans | Residential Loans | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 1,427,052 | 834,193
Residential Loans | Residential loans, at lower of cost or fair value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 893 | 1,206
Residential Loans | Residential Loans Held For Investment at Fair Value | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 3,687,265 | 3,052,652
Residential Loans | Legacy Sequoia |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 632,817 | 791,636
Residential Loans | Legacy Sequoia | Residential Loans Held For Sale |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 0 | 0
Residential Loans | Legacy Sequoia | Residential Loans | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 0 | 0
Residential Loans | Legacy Sequoia | Residential loans, at lower of cost or fair value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 0 | 0
Residential Loans | Legacy Sequoia | Residential Loans Held For Investment at Fair Value | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 632,817 | 791,636
Residential Loans | Sequoia Choice |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 620,062 | 0
Residential Loans | Sequoia Choice | Residential Loans Held For Sale |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 0 | 0
Residential Loans | Sequoia Choice | Residential Loans | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 0 | 0
Residential Loans | Sequoia Choice | Residential loans, at lower of cost or fair value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 0 | 0
Residential Loans | Sequoia Choice | Residential Loans Held For Investment at Fair Value | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 620,062 | 0
Residential Loans | Redwood |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 3,862,331 | 3,096,415
Residential Loans | Redwood | Residential Loans Held For Sale |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 1,427,945 | 835,399
Residential Loans | Redwood | Residential Loans | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 1,427,052 | 834,193
Residential Loans | Redwood | Residential loans, at lower of cost or fair value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | 893 | 1,206
Residential Loans | Redwood | Residential Loans Held For Investment at Fair Value | Jumbo Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Loan market valuation adjustment |  | $ 2,434,386 | $ 2,261,016
[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, 2017 and December 31, 2016, assets of consolidated VIEs totaled $1,259,774 and $798,317, respectively. At December 31, 2017 and December 31, 2016, liabilities of consolidated VIEs totaled $1,167,157 and $773,980, respectively. See Note 4 for further discussion.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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