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Market Valuation Adjustments, Net (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Mortgage banking activities market valuation adjustments      
Sequoia IO securities $ (23,839)us-gaap_IncreaseDecreaseInTradingSecurities $ 42,451us-gaap_IncreaseDecreaseInTradingSecurities $ (11,702)us-gaap_IncreaseDecreaseInTradingSecurities
Risk management derivatives, net (31,167)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet 51,162rwt_MortgageBankingActivitiesDerivativeInstrumentsNet (10,609)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet
Loan purchase and forward sale commitments 13,891rwt_LoanPurchaseSaleCommitmentValuations (399)rwt_LoanPurchaseSaleCommitmentValuations  
Total mortgage banking activities market valuation adjustments, net 30,929rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet [1] 91,415rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet [1] 15,451rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet [1]
MSRs (21,081)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights 11,995rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights (2,014)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights
Other market valuation adjustments      
Other market valuation adjustments, net (10,146)rwt_OtherMarketValuationAdjustmentsNet [2] (5,709)rwt_OtherMarketValuationAdjustmentsNet [2] 1,539rwt_OtherMarketValuationAdjustmentsNet [2]
Total Market Valuation Adjustments, Net (298)rwt_MarketValuationAdjustmentsNet 97,701rwt_MarketValuationAdjustmentsNet 14,976rwt_MarketValuationAdjustmentsNet
Residential Loans at Fair Value      
Mortgage banking activities market valuation adjustments      
Loans, at fair value 51,256us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtFairValueMember		 (10,493)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtFairValueMember		 37,762us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtFairValueMember
Commercial Loans at Fair Value      
Mortgage banking activities market valuation adjustments      
Loans, at fair value 20,788us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_CommercialLoansAtFairValueMember		 8,694us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_CommercialLoansAtFairValueMember		  
Other market valuation adjustments      
Other market valuation adjustments, net     241rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_CommercialLoansAtFairValueMember
Residential Loans at Lower of Cost or Fair Value      
Other market valuation adjustments      
Other market valuation adjustments, net 56rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtLowerOfCostOrFairValueMember		 38rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtLowerOfCostOrFairValueMember		 623rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
Residential Loans HFI, Fair Value      
Other market valuation adjustments      
Other market valuation adjustments, net (697)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ResidentialLoansHeldForInvestmentFairValueMember		    
Trading Securities      
Other market valuation adjustments      
Other market valuation adjustments, net (358)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_TradingAccountAssetsMember		 (3,525)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_TradingAccountAssetsMember		 97,867rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_TradingAccountAssetsMember
Impairments on AFS Securities      
Other market valuation adjustments      
Other market valuation adjustments, net (565)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ImpairedSecuritiesMember		 (1,833)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ImpairedSecuritiesMember		 (2,509)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_ImpairedSecuritiesMember
REO      
Other market valuation adjustments      
Other market valuation adjustments, net (894)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherRealEstateOwnedMember		 (612)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherRealEstateOwnedMember		 (344)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherRealEstateOwnedMember
Other Derivative Instruments      
Other market valuation adjustments      
Other market valuation adjustments, net (7,792)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherDerivativeInstrumentsMember		 223rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherDerivativeInstrumentsMember		 (12,581)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherDerivativeInstrumentsMember
Asset-backed Securities | Acacia      
Other market valuation adjustments      
Other market valuation adjustments, net     (81,758)rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_AcaciaSecuritizationEntitiesMember
Other      
Other market valuation adjustments      
Other market valuation adjustments, net $ 104rwt_OtherMarketValuationAdjustmentsNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= rwt_OtherMemberMember		    
[1] Income from mortgage banking activities presented above does not include fee income or provisions for repurchases that is a component of mortgage banking activities presented on our consolidated statements of income as these amounts do not represent a market valuation adjustment.
[2] For the year ended December 31, 2014, other-than-temporary impairments were $4,774, of which $565 were recognized through the Income Statement, and $4,209 were recognized in Accumulated Other Comprehensive Income (Loss). For the year ended December 31, 2013, other-than-temporary impairments were $4,532, of which $1,833 were recognized through the Income Statement, and $2,699 were recognized in Accumulated Other Comprehensive Income (Loss). For the year ended December 31, 2012, other-than-temporary impairments were $3,536 of which $2,509 were recognized through the Income Statement, and $1,027 were recognized in Accumulated Other Comprehensive Income (Loss).