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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Asset-backed securities at fair value	$ 1,239,065rwt_SecuredDebtFairValueDisclosure	$ 0rwt_SecuredDebtFairValueDisclosure
Long-term debt at fair value	68,707us-gaap_LongTermDebtFairValue	66,707us-gaap_LongTermDebtFairValue
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	180,000,000us-gaap_CommonStockSharesAuthorized	180,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued	83,748,621us-gaap_CommonStockSharesIssued	83,443,141us-gaap_CommonStockSharesIssued
Common stock, outstanding	83,748,621us-gaap_CommonStockSharesOutstanding	83,443,141us-gaap_CommonStockSharesOutstanding
Variable interest held by entity, assets	1,716,563us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets	1,900,208us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Variable interest held by entity, liabilities	1,354,298us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities	1,546,490us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Carrying value	3,399,755us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer	3,398,573us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Residential Loans Held For Investment At Amortized Cost
Carrying value		1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember
Commercial Loans Held For Investment
Loans at fair value	72,619us-gaap_ReceivablesFairValueDisclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember	71,262us-gaap_ReceivablesFairValueDisclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember
Sequoia | Residential Loans Held For Investment At Amortized Cost
Carrying value		$ 1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_SequoiaSecuritizationEntitiesMember

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Face amount or stated value per share of common stock.

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