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Commitments and Contingencies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jul. 15, 2010 Plaintiff | Oct. 15, 2010 Plaintiff
Loss Contingencies [Line Items] |  |  |  |  |  |
Future lease commitments with expiration date |  | $ 13,051,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |  |  |
Operating lease expense |  | 3,000,000 us-gaap_OperatingLeasesRentExpenseNet | 2,000,000 us-gaap_OperatingLeasesRentExpenseNet | 1,000,000 us-gaap_OperatingLeasesRentExpenseNet |  |
Residential repurchase reserve | 1,771,000 rwt_MortgageLoanRepurchaseReserve | 3,724,000 rwt_MortgageLoanRepurchaseReserve | 1,771,000 rwt_MortgageLoanRepurchaseReserve |  |  |
Repurchase provisions | 2,000,000 rwt_ProvisionForLoanRepurchases | 2,000,000 rwt_ProvisionForLoanRepurchases |  |  |  |
Amount charged to repurchase reserve for loan repurchased | 0 us-gaap_DebtInstrumentRepurchaseAmount | 61,000 us-gaap_DebtInstrumentRepurchaseAmount | 0 us-gaap_DebtInstrumentRepurchaseAmount |  |  |
Aggregate amount of loss contingency reserves | 12,000,000 us-gaap_LitigationReserve | 2,000,000 us-gaap_LitigationReserve | 12,000,000 us-gaap_LitigationReserve |  |  |
Schwab |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of other named defendants along with SRF |  |  |  |  | 26 us-gaap_LossContingencyNumberOfDefendants / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember |
Mortgage Servicing Rights |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Residential repurchase reserve | 2,000,000 rwt_MortgageLoanRepurchaseReserve / rwt_MortgageServicingRightsAxis = rwt_MortgageServicingRightsMember | 4,000,000 rwt_MortgageLoanRepurchaseReserve / rwt_MortgageServicingRightsAxis = rwt_MortgageServicingRightsMember | 2,000,000 rwt_MortgageLoanRepurchaseReserve / rwt_MortgageServicingRightsAxis = rwt_MortgageServicingRightsMember |  |  |
Maximum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Operating lease expiration dates |  | 2021 |  |  |  |
Unamortized leasehold improvement |  | 1,000,000 us-gaap_LeaseholdImprovementsGross / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |
Leasehold amortization expense |  | 1,000,000 rwt_AmortizationOfLeaseholdImprovement / us-gaap_RangeAxis = us-gaap_MaximumMember | 1,000,000 rwt_AmortizationOfLeaseholdImprovement / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Minimum |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of other named defendants along with SRF |  |  |  |  |  | 45 us-gaap_LossContingencyNumberOfDefendants / us-gaap_RangeAxis = us-gaap_MinimumMember
Sequoia | FHLB Seattle | Residential |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Statutory interest rate per annum |  | 8.00%rwt_PercentageInterestPlaintiff / rwt_LossContingenciesByNameOfPlaintiffAxis = us-gaap_FederalHomeLoanBankOfSeattleMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |
Original principal amount of securities |  | 133,000,000 us-gaap_DebtInstrumentFaceAmount / rwt_LossContingenciesByNameOfPlaintiffAxis = us-gaap_FederalHomeLoanBankOfSeattleMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |
Debt instrument principal payment amount |  | 115,800,000 us-gaap_RepaymentsOfBankDebt / rwt_LossContingenciesByNameOfPlaintiffAxis = us-gaap_FederalHomeLoanBankOfSeattleMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |
Debt instrument interest payment amount |  | 11,100,000 rwt_DebtInstrumentUnpaidInterestPaidByCash / rwt_LossContingenciesByNameOfPlaintiffAxis = us-gaap_FederalHomeLoanBankOfSeattleMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |
Sequoia | Schwab | Residential |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Original principal amount of securities |  | 14,800,000 us-gaap_DebtInstrumentFaceAmount / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |
Principal balance of securities |  | 12,900,000 rwt_DebtInstrumentAggregatePrincipalAmount / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |
Debt instrument interest amount |  | $ 1,300,000 rwt_DebtInstrumentAccruedInterest / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |  |

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