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Details of Retention and Purchase of MSRs (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | $ 48,000 us-gaap_ServicingAssetAtFairValueAdditions | $ 44,063 us-gaap_ServicingAssetAtFairValueAdditions | $ 7,329 us-gaap_ServicingAssetAtFairValueAdditions
Mortgage Servicing Rights |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 95,550 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 47,514 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | 8,672,671 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 5,223,399 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Jumbo MSR Additions |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 9,006 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 44,012 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | 1,061,028 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 4,911,623 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Jumbo MSR Additions | Securitization |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 8,518 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 42,920 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | 1,002,235 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 4,787,264 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_SecuritizationsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Jumbo MSR Additions | Loan Sales |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 488 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 1,092 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | 58,793 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 124,359 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_JumboMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Conforming MSR Additions |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 86,544 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 3,502 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | 7,611,643 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 311,776 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Conforming MSR Additions | Loan Sales |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 38,995 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 52 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | 3,618,256 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 5,107 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanSalesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Mortgage Servicing Rights | Conforming MSR Additions | From purchases |  |  |
Mortgage Servicing Rights [Line Items] |  |  |
MSR Fair Value | 47,549 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | 3,450 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |
Associated Principal | $ 3,993,387 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | $ 306,669 us-gaap_ServicingAssetAtAmortizedValueAdditions / us-gaap_FairValueByFairValueHierarchyLevelAxis = rwt_ConformingMortgageServicingRightsAdditionsMember / us-gaap_FinancialInstrumentAxis = rwt_LoanPurchasesMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |

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- Definition Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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