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Summary of Classifications and Carrying Value of Residential Loans (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 3,398,573us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer	$ 2,166,434us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer	$ 2,835,470us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Residential Loans at Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,340,000us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember	403,000us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember
Residential Loans at Fair Value | Conforming Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	244,714us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember	11,502us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember
Residential Loans at Fair Value | Jumbo Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,096,317us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember	391,100us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember
Residential Loans at Lower of Cost or Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,488us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember	1,665us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
Residential Loans Held For Investment at Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	581,668us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember
Residential Loans Held For Investment At Amortized Cost
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember	1,762,167us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember
Redwood
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,924,187us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	404,267us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Redwood | Residential Loans at Fair Value | Conforming Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	244,714us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	11,502us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Redwood | Residential Loans at Fair Value | Jumbo Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,096,317us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	391,100us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Redwood | Residential Loans at Lower of Cost or Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,488us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	1,665us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Redwood | Residential Loans Held For Investment at Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	581,668us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Sequoia
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	1,762,167us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans Held For Investment At Amortized Cost
Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	$ 1,762,167us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember

X

- Definition

Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of consumer loans, including, but not limited to, mortgage, home equity, vehicles, credit card, installment, and lease financing. 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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