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

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- Definition

Loans Financed through Securitization

+ References

No definition available.

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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

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