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Short-Term Debt - Outstanding Balances of Short-Term Debt by Type of Collateral Securing Debt (Detail) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Contract
Dec. 31, 2014
Contract
Short-term Debt [Line Items]    
Number of Facilities 18rwt_NumberOfFacilities 17rwt_NumberOfFacilities
Outstanding $ 1,502,164,000us-gaap_ShortTermBorrowings [1] $ 1,793,825,000us-gaap_ShortTermBorrowings [1]
Residential Loans    
Short-term Debt [Line Items]    
Number of Facilities 5rwt_NumberOfFacilities
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember		 5rwt_NumberOfFacilities
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Outstanding 815,037,000us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember		 1,076,188,000us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Limit 1,550,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember		 1,550,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Residential Loans | Minimum    
Short-term Debt [Line Items]    
Maturity 2015-04 2015-02
Residential Loans | Maximum    
Short-term Debt [Line Items]    
Maturity 2016-02 2015-12
Commercial Loans    
Short-term Debt [Line Items]    
Number of Facilities 3rwt_NumberOfFacilities
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember		 3rwt_NumberOfFacilities
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember
Outstanding 80,858,000us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember		 109,128,000us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember
Limit 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember		 400,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember
Commercial Loans | Minimum    
Short-term Debt [Line Items]    
Maturity 2015-04 2015-04
Commercial Loans | Maximum    
Short-term Debt [Line Items]    
Maturity 2016-10 2016-10
Real Estate Securities    
Short-term Debt [Line Items]    
Number of Facilities 10rwt_NumberOfFacilities
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember		 9rwt_NumberOfFacilities
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember
Outstanding $ 606,269,000us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember		 $ 608,509,000us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember
Real Estate Securities | Minimum    
Short-term Debt [Line Items]    
Maturity 2015-04 2015-01
Real Estate Securities | Maximum    
Short-term Debt [Line Items]    
Maturity 2015-06 2015-03
[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.