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Summary of Classifications and Carrying Value of Commercial Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commercial Loans [Line Items]
Commercial loans	$ 566,927us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial	$ 432,455us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial	$ 313,010us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial
Commercial Loans at Fair Value
Commercial Loans [Line Items]
Commercial loans	166,234us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember	89,111us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansAtFairValueMember
Commercial Loans Held-for-Investment, at Fair Value
Commercial Loans [Line Items]
Commercial loans	71,262us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtFairValueMember
Commercial Loans Held-for-Investment, at Amortized Cost
Commercial Loans [Line Items]
Commercial loans	$ 329,431us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember	$ 343,344us-gaap_LoansAndLeasesReceivableNetReportedAmountCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentAtAmortizedCostMember

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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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