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Commercial Loans - Summary of Classifications and Carrying Value of Commercial Loans (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | $ 460,342,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial | $ 566,927,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Commercial Loans at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | 54,407,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember | 166,234,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember
Commercial Loans Held-for-Investment, at Fair Value |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | 72,619,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember | 71,262,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember
Commercial Loans Held-for-Investment, at Amortized Cost |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Commercial loans | 333,316,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember | 329,431,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember
Commercial loans financed through Commercial Securitization entity | $ 192,000,000 rwt_LoansFinancedThroughSecuritization / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember | $ 195,000,000 rwt_LoansFinancedThroughSecuritization / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember

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- Definition Loans Financed through Securitization + References No definition available. + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of commercial loans and leases receivable including, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5074-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 + Details
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