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Mortgage Servicing Rights - Schedule of Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]
MSR Fair Value	$ 120,324us-gaap_ServicingAssetAtFairValueAmount	[1]	$ 139,293us-gaap_ServicingAssetAtFairValueAmount	[1]
Associated Principal	12,652,638us-gaap_ServicingAsset		13,667,930us-gaap_ServicingAsset
Conforming Loan
Servicing Assets at Fair Value [Line Items]
MSR Fair Value	69,203us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember		81,301us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember
Associated Principal	6,800,645us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember		7,705,146us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember
Jumbo Loan
Servicing Assets at Fair Value [Line Items]
MSR Fair Value	51,121us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember		57,992us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember
Associated Principal	$ 5,851,993us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember		$ 5,962,784us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember
[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 the primary beneficiary (Redwood Trust, Inc.). At March 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,716,563 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,354,298 and $1,546,490, respectively. See Note 4 for further discussion.

X

- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

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