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Fair Value of Financial Instruments - Market Valuation Adjustments, Net (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Mortgage banking activities market valuation adjustments
Adjustment to valuation of trading securities	$ (14,359)us-gaap_IncreaseDecreaseInTradingSecurities		$ (4,277)us-gaap_IncreaseDecreaseInTradingSecurities
Risk management derivatives, net	(10,583)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet		(7,082)rwt_MortgageBankingActivitiesDerivativeInstrumentsNet
Loan purchase and forward sale commitments	18,256rwt_LoanPurchaseSaleCommitmentValuations		8rwt_LoanPurchaseSaleCommitmentValuations
Total mortgage banking activities	1,227rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet		(597)rwt_MortgageBankingActivitiesMarketValuationAdjustmentsNet
MSRs	(19,517)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights		(2,711)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights
Other market valuation adjustments
Other market valuation adjustments, net	(1,145)rwt_OtherMarketValuationAdjustmentsNet	[1]	(6,138)rwt_OtherMarketValuationAdjustmentsNet	[1]
Total Market Valuation Adjustments, Net	(19,435)rwt_MarketValuationAdjustmentsNet		(9,446)rwt_MarketValuationAdjustmentsNet
Residential Loans at Fair Value
Mortgage banking activities market valuation adjustments
Valuation adjustments	2,056us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember		7,128us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember
Commercial Loans at Fair Value
Mortgage banking activities market valuation adjustments
Valuation adjustments	5,857us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember		3,626us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember
Residential Loans at Lower of Cost or Fair Value
Other market valuation adjustments
Other market valuation adjustments, net	2rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember		(2)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
Residential Loans Held for Investment
Other market valuation adjustments
Other market valuation adjustments, net	(1,093)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember		0rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember
Held For Investment Loans At Fair Value
Other market valuation adjustments
Other market valuation adjustments, net	1,978rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_HeldForInvestmentLoansAtFairValueMember		0rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_HeldForInvestmentLoansAtFairValueMember
Trading Securities
Other market valuation adjustments
Other market valuation adjustments, net	270rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember		(154)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_TradingAccountAssetsMember
Impairments on AFS Securities
Other market valuation adjustments
Other market valuation adjustments, net	0rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember		(113)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ImpairedSecuritiesMember
Other derivative instruments, net
Other market valuation adjustments
Other market valuation adjustments, net	(1,374)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember		(5,727)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherDerivativeInstrumentsMember
Guarantee asset
Other market valuation adjustments
Other market valuation adjustments, net	(1,083)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_GuaranteeAssetMember		0rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_GuaranteeAssetMember
Other
Other market valuation adjustments
Other market valuation adjustments, net	$ 155rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherFinancingReceivableMember		$ (142)rwt_OtherMarketValuationAdjustmentsNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_OtherFinancingReceivableMember
[1] For the three months ended March 31, 2015, there were no other-than-temporary impairments. For the three months ended March 31, 2014, other-than-temporary impairments were $1,671, of which $113 were recognized through the Income Statement and $1,558 were recognized in Accumulated Other Comprehensive Income.

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Total net change in market value related to mortgage servicing rights.

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For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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Amount of increase (decrease) in the fair value of equity or debt securities classified as trading.

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