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Short-Term Debt - By Weighted Average Interest Rates and Collateral Type (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]    
Amount Borrowed $ 1,502,164us-gaap_ShortTermBorrowings [1] $ 1,793,825us-gaap_ShortTermBorrowings [1]
Weighted Average Interest Rate 1.74%us-gaap_ShortTermDebtWeightedAverageInterestRate 1.73%us-gaap_ShortTermDebtWeightedAverageInterestRate
Weighted Average Days Until Maturity 130 days 112 days
Residential Loans    
Short-term Debt [Line Items]    
Amount Borrowed 815,037us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember		 1,076,188us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Weighted Average Interest Rate 1.74%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember		 1.74%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ResidentialMortgageMember
Weighted Average Days Until Maturity 191 days 156 days
Commercial Loans    
Short-term Debt [Line Items]    
Amount Borrowed 80,858us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember		 109,128us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember
Weighted Average Interest Rate 4.40%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember		 3.66%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_CommercialLoanMember
Weighted Average Days Until Maturity 288 days 185 days
Real Estate Securities    
Short-term Debt [Line Items]    
Amount Borrowed $ 606,269us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember		 $ 608,509us-gaap_ShortTermBorrowings
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember
Weighted Average Interest Rate 1.38%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember		 1.38%us-gaap_ShortTermDebtWeightedAverageInterestRate
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_RealEstateInvestmentMember
Weighted Average Days Until Maturity 26 days 20 days
[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.