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Schedule of Fair Value of MSRs and Aggregate Principal Amounts of Associated Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]
MSR Fair Value	$ 139,293us-gaap_ServicingAssetAtFairValueAmount	$ 64,824us-gaap_ServicingAssetAtFairValueAmount	$ 5,315us-gaap_ServicingAssetAtFairValueAmount
Associated Principal	13,667,930us-gaap_ServicingAsset	5,791,758us-gaap_ServicingAsset
Conforming Loan
Servicing Assets at Fair Value [Line Items]
MSR Fair Value	81,301us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember	3,331us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember
Associated Principal	7,705,146us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember	308,258us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember
Jumbo Loan
Servicing Assets at Fair Value [Line Items]
MSR Fair Value	57,992us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember	61,493us-gaap_ServicingAssetAtFairValueAmount / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember
Associated Principal	$ 5,962,784us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember	$ 5,483,500us-gaap_ServicingAsset / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember

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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X

- 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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