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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 Investment	Dec. 31, 2014
Variable Interest Entity [Line Items]
Assets	$ 1,716,563us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets	$ 1,900,208us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Liabilities	1,354,298us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities	1,546,490us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Number of VIEs	26rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated
Residential Loans Held for Investment
Variable Interest Entity [Line Items]
Assets	1,304,426us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember
Commercial Loans Held For Investment
Variable Interest Entity [Line Items]
Assets	191,575us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember
Real Estate Securities
Variable Interest Entity [Line Items]
Assets	211,316us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember
Restricted Cash
Variable Interest Entity [Line Items]
Assets	282us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Accrued Interest Receivable
Variable Interest Entity [Line Items]
Assets	3,660us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Other Assets
Variable Interest Entity [Line Items]
Assets	5,304us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember
Accrued Interest Payable
Variable Interest Entity [Line Items]
Liabilities	1,277us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Asset-backed Securities
Variable Interest Entity [Line Items]
Liabilities	1,353,021us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember
Sequoia
Variable Interest Entity [Line Items]
Assets	1,311,597us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Liabilities	1,239,958us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Number of VIEs	24rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans Held for Investment
Variable Interest Entity [Line Items]
Assets	1,304,426us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember
Sequoia | Restricted Cash
Variable Interest Entity [Line Items]
Assets	147us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Sequoia | Accrued Interest Receivable
Variable Interest Entity [Line Items]
Assets	1,720us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Sequoia | Other Assets
Variable Interest Entity [Line Items]
Assets	5,304us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember
Sequoia | Accrued Interest Payable
Variable Interest Entity [Line Items]
Liabilities	893us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Sequoia | Asset-backed Securities
Variable Interest Entity [Line Items]
Liabilities	1,239,065us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember
Residential Resecuritization
Variable Interest Entity [Line Items]
Assets	211,765us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Liabilities	34,290us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Number of VIEs	1rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Real Estate Securities
Variable Interest Entity [Line Items]
Assets	211,316us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember
Residential Resecuritization | Restricted Cash
Variable Interest Entity [Line Items]
Assets	0us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Residential Resecuritization | Accrued Interest Receivable
Variable Interest Entity [Line Items]
Assets	449us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Residential Resecuritization | Accrued Interest Payable
Variable Interest Entity [Line Items]
Liabilities	10us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Residential Resecuritization | Asset-backed Securities
Variable Interest Entity [Line Items]
Liabilities	34,280us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember
Commercial Securitization
Variable Interest Entity [Line Items]
Assets	193,201us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Liabilities	80,050us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Number of VIEs	1rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Commercial Loans Held For Investment
Variable Interest Entity [Line Items]
Assets	191,575us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember
Commercial Securitization | Restricted Cash
Variable Interest Entity [Line Items]
Assets	135us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember
Commercial Securitization | Accrued Interest Receivable
Variable Interest Entity [Line Items]
Assets	1,491us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember
Commercial Securitization | Other Assets
Variable Interest Entity [Line Items]
Assets	0us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember
Commercial Securitization | Accrued Interest Payable
Variable Interest Entity [Line Items]
Liabilities	374us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember
Commercial Securitization | Asset-backed Securities
Variable Interest Entity [Line Items]
Liabilities	$ 79,676us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember

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The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

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-URI http://asc.fasb.org/extlink&oid=28200181&loc=d3e5710-111685

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

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-Topic 810

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