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Principles of Consolidation - Assets and Liabilities of Consolidated Variable Interest Entity's (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 Investment | Dec. 31, 2014
Variable Interest Entity [Line Items] |  |
Assets | $ 1,716,563 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets | $ 1,900,208 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Liabilities | 1,354,298 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities | 1,546,490 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Number of VIEs | 26 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated |
Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,304,426 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 191,575 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember |
Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 211,316 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember |
Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 282 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember |
Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 3,660 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember |
Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 5,304 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember |
Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,277 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember |
Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,353,021 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember |
Sequoia |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,311,597 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Liabilities | 1,239,958 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Number of VIEs | 24 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |
Sequoia | Residential Loans Held for Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,304,426 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Sequoia | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 147 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember |
Sequoia | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,720 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember |
Sequoia | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 5,304 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember |
Sequoia | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 893 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember |
Sequoia | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 1,239,065 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember |
Residential Resecuritization |  |
Variable Interest Entity [Line Items] |  |
Assets | 211,765 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Liabilities | 34,290 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Number of VIEs | 1 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember |
Residential Resecuritization | Real Estate Securities |  |
Variable Interest Entity [Line Items] |  |
Assets | 211,316 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_RealEstateInvestmentMember |
Residential Resecuritization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember |
Residential Resecuritization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 449 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember |
Residential Resecuritization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 10 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember |
Residential Resecuritization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 34,280 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_ResecuritizationMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember |
Commercial Securitization |  |
Variable Interest Entity [Line Items] |  |
Assets | 193,201 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
Liabilities | 80,050 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
Number of VIEs | 1 rwt_NumberOfVariableInterestEntitiesAcquiredAndConsolidated / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember |
Commercial Securitization | Commercial Loans Held For Investment |  |
Variable Interest Entity [Line Items] |  |
Assets | 191,575 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_CommercialLoansHeldForInvestmentMember |
Commercial Securitization | Restricted Cash |  |
Variable Interest Entity [Line Items] |  |
Assets | 135 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_RestrictedCashMember |
Commercial Securitization | Accrued Interest Receivable |  |
Variable Interest Entity [Line Items] |  |
Assets | 1,491 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestReceivableMember |
Commercial Securitization | Other Assets |  |
Variable Interest Entity [Line Items] |  |
Assets | 0 us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_OtherAssetsMember |
Commercial Securitization | Accrued Interest Payable |  |
Variable Interest Entity [Line Items] |  |
Liabilities | 374 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = rwt_InterestPayableMember |
Commercial Securitization | Asset-backed Securities |  |
Variable Interest Entity [Line Items] |  |
Liabilities | $ 79,676 us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_CommercialSecuritizationEntityMember / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_AssetBackedSecuritiesMember |

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