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Commercial Loans - Additional Information (Details) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2015 loan		Mar. 31, 2014	Dec. 31, 2014 loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate fair value	$ 460,342,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial			$ 566,927,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Senior commercial loans, held for sale	2,558,425,000us-gaap_PaymentsToPurchaseLoansHeldForSale		1,181,488,000us-gaap_PaymentsToPurchaseLoansHeldForSale
Sale of loan for third party, held for sale	2,455,452,000us-gaap_ProceedsFromSaleOfLoansHeldForSale		785,380,000us-gaap_ProceedsFromSaleOfLoansHeldForSale
Commercial Loans Held For Sale
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	5us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember			13us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember
Principal balance	53,000,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember			163,000,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember
Aggregate fair value	54,407,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember	[1]		166,234,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember	[1]
Senior commercial loans, held for sale	93,000,000us-gaap_PaymentsToPurchaseLoansHeldForSale / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember
Sale of loan for third party, held for sale	203,000,000us-gaap_ProceedsFromSaleOfLoansHeldForSale / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember
Valuation adjustments	6,000,000us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember		2,000,000us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForSaleMember
Commercial Loans Held-for-Investment, at Fair Value
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	3us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember
Principal balance	67,000,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember			68,000,000us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember
Aggregate fair value	72,619,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember			71,262,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember
Valuation adjustments	2,000,000us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember		1,000,000us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember
Commercial Loans Held-for-Investment, at Amortized Cost
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans	62us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember			60us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember
Aggregate fair value	333,316,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember			329,431,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember
Acquired amount of loans held for investment	8,000,000us-gaap_PaymentsToAcquireLoansHeldForInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember
Recorded investment in loans	340,978,000us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember			336,888,000us-gaap_NotesReceivableNet / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year	2.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_FiscalYearTwentyFifteenMember
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year	17.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_FiscalYearTwentyFourteenMember
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year	17.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_OriginatedDuringTwentyThirteenMember
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year	36.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_OriginatedDuringTwentyTwelveMember
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year	24.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_OriginatedDuringTwentyElevenMember
Commercial Loans Held-for-Investment, at Amortized Cost | Originated During 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of loan portfolio originated in year	4.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_OriginatedDuringTwentyTenMember
Commercial Loans Held For Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate fair value	$ 405,935,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember	[1]		$ 400,693,000us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember	[1]
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to the primary beneficiary (Redwood Trust, Inc.). At March 31, 2015 and December 31, 2014, assets of consolidated VIEs totaled $1,716,563 and $1,900,208, respectively, and liabilities of consolidated VIEs totaled $1,354,298 and $1,546,490, respectively. See Note 4 for further discussion.

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Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Excludes loans and leases covered under loss sharing agreements.

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Indicates the number of mortgages under each classification.

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The total periodic movement (increases and decreases) in the carrying amount of mortgage loans on real estate.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future.

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