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Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Loan Purchase Commitments
Derivatives
Beginning balance	$ (379)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Principal paydowns	0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPeriodIncreaseDecrease / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Amortization income	0rwt_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationAmortizationIncome / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Gains (losses) in net income, net	14,527us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Unrealized gains in OCI, net	0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Acquisitions	0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationPurchases / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Sales	0us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSales / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Other settlements, net	(13,029)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisUnobservableInputsReconciliationSettlements / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Ending balance	1,119us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember		(379)us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Liabilities
Beginning balance	379us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	[1]
Gains (losses) in net income, net			480us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	[1]
Unrealized gains in OCI, net			0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	[1]
Sales			0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	[1]
Other settlements, net			(101)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	[1]
Ending Balance			379us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	[1]
Residential Loans at Fair Value
Assets
Beginning balance	391,100us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		553,576us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Principal paydowns	(42,657)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		(16,166)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Gains (losses) in net income, net	56,835us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		(34,650)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Acquisitions	5,020,988us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		7,090,724us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Sales	(3,746,417)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		(7,201,472)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Other settlements, net	(1,865)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		(912)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Ending Balance	1,677,984us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember		391,100us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansAtFairValueMember
Commercial Loans
Assets
Beginning balance	89,111us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Principal paydowns	(4,157)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember		(189)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Gains (losses) in net income, net	22,824us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember		8,694us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Acquisitions	937,594us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember		505,151us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Sales	(807,931)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember		(424,545)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Other settlements, net	55us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Ending Balance	237,496us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember		89,111us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_CommercialLoanMember
Trading Securities
Assets
Beginning balance	124,555us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember		33,172us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Principal paydowns	(5,934)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember		(1,244)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Gains (losses) in net income, net	(24,167)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember		41,074us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Acquisitions	81,545us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember		109,320us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Sales	(64,393)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember		(57,767)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Ending Balance	111,606us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember		124,555us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Available-for-sale Securities
Assets
Beginning balance	1,558,306us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		1,075,581us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Principal paydowns	(168,308)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		(162,708)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetCallsMaturitiesPaydowns / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Amortization income	32,774rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetAmortizationIncome / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Gains (losses) in net income, net	23,412us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		57,852us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Unrealized gains in OCI, net	24,302us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		(21,924)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Acquisitions	237,499us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		785,671us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Sales	(440,361)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		(176,166)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Ending Balance	1,267,624us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember		1,558,306us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Mortgage Servicing Rights
Assets
Beginning balance	64,824us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember		5,315us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Gains (losses) in net income, net	(21,081)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember		11,995us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Acquisitions	95,550us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember		47,514us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Ending Balance	139,293us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember		64,824us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Guarantee Asset
Assets
Acquisitions	7,201us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Ending Balance	7,201us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Commercial Secured Borrowings
Liabilities
Principal paydowns	(374)rwt_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPaydowns / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
Amortization income	0rwt_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityAmortizationIncome / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
Gains (losses) in net income, net	2,033us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
Unrealized gains in OCI, net	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
Acquisitions	65,048us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
Sales	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
Ending Balance	$ 66,707us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue / us-gaap_FairValueByAssetClassAxis = rwt_CommercialSecuredLoanMember
[1] Loan Purchase Commitments are presented net, and may have an asset or liability beginning or ending balance.

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Principal paydowns, including calls and maturities, that have taken place during the period in relation to assets measured at fair value and categorized within Level 3 of the fair value hierarchy.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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