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Commercial Loans - Commercial Loans Held for Investment by Risk Category (Details) (Commercial Loans Held For Investment, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held for investment	$ 345,646us-gaap_LoansAndLeasesReceivableCommercial	$ 341,750us-gaap_LoansAndLeasesReceivableCommercial
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held for investment	320,075us-gaap_LoansAndLeasesReceivableCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember	316,122us-gaap_LoansAndLeasesReceivableCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PassMember
Watch List
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial loans held for investment	$ 25,571us-gaap_LoansAndLeasesReceivableCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_InternalCreditAssessmentAxis = rwt_WatchListMember	$ 25,628us-gaap_LoansAndLeasesReceivableCommercial / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember / us-gaap_InternalCreditAssessmentAxis = rwt_WatchListMember

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- Definition

Amount before allowance of commercial loans and leases receivable includes, 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. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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