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Fair Value of Financial Instruments - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Commercial Secured Borrowings
Liabilities
Beginning balance	$ 66,707us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Principal paydowns	(152)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityPaydowns / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Gains (losses) in net income, net	1,509us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Unrealized gains in OCI, net	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Acquisitions	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Sales	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Other settlements, net	13us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Ending balance	68,077us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Asset-backed Securities
Liabilities
Transfer to FVO	1,302,216us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3 / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember
Principal paydowns	(66,517)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityPaydowns / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember
Gains (losses) in net income, net	2,946us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember
Other settlements, net	421us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember
Ending balance	1,239,066us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember
Residential Loans at Fair Value
Assets
Beginning balance	1,677,984us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Transfer to FVO	1,370,699us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Principal paydowns	(111,716)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Gains (losses) in net income, net	(7,570)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Unrealized gains in OCI, net	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Acquisitions	1,112,042us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Sales	(857,249)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Other settlements, net	(1,916)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Ending balance	3,197,414us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Commercial Loans
Assets
Beginning balance	237,496us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Principal paydowns	(240)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Gains (losses) in net income, net	(7,366)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Unrealized gains in OCI, net	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Acquisitions	92,713us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Sales	(210,309)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Ending balance	127,026us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Trading Securities
Assets
Beginning balance	111,606us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Principal paydowns	(203)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Gains (losses) in net income, net	14,114us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Unrealized gains in OCI, net	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Acquisitions	23,084us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Sales	(13,536)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Ending balance	106,837us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Available-for-sale Securities
Assets
Beginning balance	1,267,624us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Principal paydowns	(26,110)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Gains (losses) in net income, net	(4,306)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized gains in OCI, net	(3,795)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Acquisitions	9,831us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Sales	(90,878)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Ending balance	1,178,406us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Liabilities
Amortization income	9,838rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAmortizationIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Mortgage Servicing Rights
Assets
Beginning balance	139,293us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Gains (losses) in net income, net	19,517us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Unrealized gains in OCI, net	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Acquisitions	18,754us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Sales	(18,206)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Ending balance	120,324us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Guarantee Asset
Assets
Beginning balance	7,201us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Gains (losses) in net income, net	1,083us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Ending balance	6,118us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Loan Purchase Commitments
Assets
Beginning balance	1,119us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Gains (losses) in net income, net	(20,087)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Other settlements, net	(13,781)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Ending balance	$ 7,425us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember

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