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Commitments and Contingencies - Additional Information (Detail) (USD $) | 3 Months Ended | 0 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 loan repurchase_request lease | Mar. 31, 2014 | Jul. 15, 2010 Plaintiff | Dec. 31, 2014
Loss Contingencies [Line Items] |  |  |  |
Number of noncancelable leases | 9 rwt_OperatingLeasesNumberOfLeasesNoncancelable |  |  |
Future lease commitments with expiration date | $ 12,346,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDue |  |  |
Residential repurchase reserve | 4,292,000 rwt_MortgageLoanOnRealEstateRepurchaseReserve |  |  | 3,724,000 rwt_MortgageLoanOnRealEstateRepurchaseReserve
Residential repurchase provisions recorded | 1,000,000 rwt_MortgageLoansOnRealEstateRepurchaseProvision | 1,000,000 rwt_MortgageLoansOnRealEstateRepurchaseProvision |  |
Residential repurchase requests | 25 rwt_MortgageLoansOnRealEstateRepurchaseRequests |  |  |
Resdential repurchase, number of loans repurchased | 1 rwt_MortgageLoansOnRealEstateNumberOfLoansRepurchased |  |  |
Aggregate amount of loss contingency reserves | 2,000,000 us-gaap_LitigationReserve |  |  | 2,000,000 us-gaap_LitigationReserve
Schwab |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of other named defendants along with SRF |  |  | 26 us-gaap_LossContingencyNumberOfDefendants / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember |
Maximum |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Operating lease expiration dates | 2021 |  |  |
Operating lease expense (less than) | 1,000,000 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RangeAxis = us-gaap_MaximumMember | 0 us-gaap_OperatingLeasesRentExpenseNet / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
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 | 116,000,000 us-gaap_RepaymentsOfBankDebt / rwt_LossContingenciesByNameOfPlaintiffAxis = us-gaap_FederalHomeLoanBankOfSeattleMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |
Debt instrument interest payment amount | 11,000,000 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 | 15,000,000 us-gaap_DebtInstrumentFaceAmount / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |
Principal balance of securities | 13,000,000 rwt_DebtInstrumentAggregatePrincipalAmount / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |
Debt instrument interest amount | $ 1,000,000 rwt_DebtInstrumentAccruedInterest / rwt_LossContingenciesByNameOfPlaintiffAxis = rwt_CharlesSchwabCorporationMember / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember |  |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 + Details
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