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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Mortgage Servicing Rights [Line Items]
MSR Fair Value	$ 15,675us-gaap_ServicingAssetAtFairValueAdditions	$ 2,294us-gaap_ServicingAssetAtFairValueAdditions
Mortgage Servicing Rights
Mortgage Servicing Rights [Line Items]
MSR Fair Value	18,754us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember	2,858us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Associated Principal	1,908,993us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember
Mortgage Servicing Rights | Jumbo MSR Additions
Mortgage Servicing Rights [Line Items]
MSR Fair Value	1,964us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember
Associated Principal	237,997us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember
Mortgage Servicing Rights | Jumbo MSR Additions | Securitization
Mortgage Servicing Rights [Line Items]
MSR Fair Value	1,872us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember
Associated Principal	227,852us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember
Mortgage Servicing Rights | Jumbo MSR Additions | Loan Sales
Mortgage Servicing Rights [Line Items]
MSR Fair Value	92us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember
Associated Principal	10,145us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboMortgageServicingRightsAdditionsMember
Mortgage Servicing Rights | Conforming MSR Additions
Mortgage Servicing Rights [Line Items]
MSR Fair Value	16,790us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember
Associated Principal	1,670,996us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember
Mortgage Servicing Rights | Conforming MSR Additions | Loan Sales
Mortgage Servicing Rights [Line Items]
MSR Fair Value	13,711us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember
Associated Principal	1,352,658us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember
Mortgage Servicing Rights | Conforming MSR Additions | From purchases
Mortgage Servicing Rights [Line Items]
MSR Fair Value	3,079us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember
Associated Principal	$ 318,338us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingMortgageServicingRightsAdditionsMember

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- Details

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Namespace Prefix:	rwt_
Data Type:	xbrli:stringItemType
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X

- Definition

Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 4

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ 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)(2)

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

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

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Balance Type:
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