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Asset-Backed Securities Issued - Components of Asset-Backed Securities Issued by Consolidated Securitization Entities Sponsored, Along With Other Selected Information (Detail) (USD $)
In Thousands, unless otherwise specified

3 Months Ended

12 Months Ended

Mar. 31, 2015

Dec. 31, 2014

Debt Instrument [Line Items]

ABS issued principal

1,353,021us-gaap_SecuredDebt

^[1],[2]

1,545,119us-gaap_SecuredDebt

^[1],[2]

Asset-backed Securities

Debt Instrument [Line Items]

Market valuation adjustments

(126,203)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
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Unamortized discount

(12,373)us-gaap_DebtInstrumentUnamortizedDiscount
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ABS issued principal

1,353,021us-gaap_SecuredDebt
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= us-gaap_AssetBackedSecuritiesMember

1,545,119us-gaap_SecuredDebt
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= us-gaap_AssetBackedSecuritiesMember

Asset-backed Securities | Certificates With Principal Value

Debt Instrument [Line Items]

Principal value

1,473,602us-gaap_DebtInstrumentFaceAmount
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1,555,413us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember

Asset-backed Securities | Interest Only Certificates

Debt Instrument [Line Items]

Principal value

5,622us-gaap_DebtInstrumentFaceAmount
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2,079us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_InvestmentTypeAxis
= rwt_InterestOnlyCertificatesMember

Asset-backed Securities | Sequoia

Debt Instrument [Line Items]

Market valuation adjustments

(126,203)us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleCumulativeEffectOfChangeOnEquityOrNetAssets1
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember

Unamortized discount

(12,373)us-gaap_DebtInstrumentUnamortizedDiscount
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ABS issued principal

1,239,065us-gaap_SecuredDebt
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember

1,416,762us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember

Number of series

24rwt_NumberOfSeries
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= rwt_SequoiaSecuritizationEntitiesMember

24rwt_NumberOfSeries
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= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember

Asset-backed Securities | Sequoia | Minimum

Debt Instrument [Line Items]

Weighted average interest rates, by series

0.38%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
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0.36%us-gaap_DebtWeightedAverageInterestRate
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= us-gaap_MinimumMember
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= rwt_SequoiaSecuritizationEntitiesMember

Stated maturities

2017

2014

Asset-backed Securities | Sequoia | Maximum

Debt Instrument [Line Items]

Weighted average interest rates, by series

4.30%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
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4.27%us-gaap_DebtWeightedAverageInterestRate
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Stated maturities

2041

2041

Asset-backed Securities | Sequoia | Certificates With Principal Value

Debt Instrument [Line Items]

Principal value

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= rwt_SequoiaSecuritizationEntitiesMember

1,427,056us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_SequoiaSecuritizationEntitiesMember

Asset-backed Securities | Sequoia | Interest Only Certificates

Debt Instrument [Line Items]

Principal value

5,622us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= rwt_InterestOnlyCertificatesMember
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= rwt_SequoiaSecuritizationEntitiesMember

2,079us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= rwt_InterestOnlyCertificatesMember
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= rwt_SequoiaSecuritizationEntitiesMember

Asset-backed Securities | Residential Resecuritization

Debt Instrument [Line Items]

ABS issued principal

34,280us-gaap_SecuredDebt
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
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45,044us-gaap_SecuredDebt
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember

Weighted average interest rates, by series

2.17%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember

2.16%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember

Stated maturities

2046

2046

Number of series

1rwt_NumberOfSeries
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/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember

1rwt_NumberOfSeries
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember

Asset-backed Securities | Residential Resecuritization | Certificates With Principal Value

Debt Instrument [Line Items]

Principal value

34,280us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember
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45,044us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_ResecuritizationMember

Asset-backed Securities | Commercial Securitization

Debt Instrument [Line Items]

ABS issued principal

79,676us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember

83,313us-gaap_SecuredDebt
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember

Weighted average interest rates, by series

5.62%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember

5.62%us-gaap_DebtWeightedAverageInterestRate
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember

Stated maturities

2018

2018

Number of series

1rwt_NumberOfSeries
/ us-gaap_DebtInstrumentAxis
= us-gaap_AssetBackedSecuritiesMember
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= rwt_CommercialSecuritizationEntityMember

1rwt_NumberOfSeries
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Asset-backed Securities | Commercial Securitization | Certificates With Principal Value

Debt Instrument [Line Items]

Principal value

79,676us-gaap_DebtInstrumentFaceAmount
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/ us-gaap_InvestmentTypeAxis
= rwt_CertificatesWithPrincipalValueMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= rwt_CommercialSecuritizationEntityMember

83,313us-gaap_DebtInstrumentFaceAmount
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[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.

[2]

On January 1, 2015, we adopted ASU 2014-13 and began to account for residential loans held-for-investment and asset backed securities issued at consolidated Sequoia entities (which are VIEs) at fair value. At December 31, 2014, amounts presented in residential loans held-for-investment for these assets included $1,474,386 at historical cost. See Note 3 for further discussion.

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Debt Instrument Maturity Year

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Number of Series

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Face (par) amount of debt instrument at time of issuance.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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