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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
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Mar. 31, 2015 | Dec. 31, 2014
Short-term Debt [Line Items] |  |  |  |
Amount Borrowed | $ 1,502,164 us-gaap_ShortTermBorrowings | [1] | $ 1,793,825 us-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 | 815,037 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_ResidentialMortgageMember |  | 1,076,188 us-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 | 80,858 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_CommercialLoanMember |  | 109,128 us-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 | $ 606,269 us-gaap_ShortTermBorrowings / us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis = us-gaap_RealEstateInvestmentMember |  | $ 608,509 us-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.

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