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Asset-Backed Securities Issued - Summary of Carrying Value Components of Collateral for Asset-Backed Securities Issued and Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 1,716,563rwt_CollateralForAssetBackedSecuritiesIssued	$ 1,900,118rwt_CollateralForAssetBackedSecuritiesIssued
Residential Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,304,426rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember	1,474,386rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember
Commercial Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	191,575rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember	194,991rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember
Real Estate Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	211,316rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember	221,676rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember
Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	282rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember	327rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember
Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	3,660rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember	4,347rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember
REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	5,304rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember	4,391rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember
Sequoia
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,311,597rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	1,481,283rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,304,426rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	1,474,386rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_ResidentialLoansMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	147rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	147rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,720rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	2,359rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	5,304rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	4,391rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Residential Resecuritization
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	211,765rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember	222,196rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Real Estate Securities
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	211,316rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember	221,676rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	0rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember	43rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Residential Resecuritization | Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	449rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember	477rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember
Commercial Securitization
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	193,201rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember	196,639rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Commercial Loans
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	191,575rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember	194,991rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Restricted Cash
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	135rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember	137rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | Accrued Interest Receivable
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	1,491rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember	1,511rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_InterestReceivableMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember
Commercial Securitization | REO
Financial Instruments Owned and Pledged as Collateral [Line Items]
Collateral for ABS Issued	$ 0rwt_CollateralForAssetBackedSecuritiesIssued / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = rwt_OtherRealEstateOwnedMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember

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