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Residential Loans - Summary of Classifications and Carrying Value of Residential Loans (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Mortgage Loans on Real Estate [Line Items]
Residential loans	$ 3,399,755us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer	$ 3,398,573us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Residential Loans at Fair Value | Conforming Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	200,869us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember	244,714us-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	892,544us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember	1,096,317us-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	1,472us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember	1,488us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
Residential Loans Held For Investment at Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,000,000us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember
Residential Loans Held For Investment at Fair Value | Jumbo Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	2,304,870us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember	581,668us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember
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
Redwood
Mortgage Loans on Real Estate [Line Items]
Residential loans	2,095,329us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	1,924,187us-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	200,869us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	244,714us-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	892,544us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	1,096,317us-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	1,472us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	1,488us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Redwood | Residential Loans Held For Investment at Fair Value | Jumbo Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,000,444us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember	581,668us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Redwood | Residential Loans Held For Investment At Amortized Cost
Mortgage Loans on Real Estate [Line Items]
Residential loans		0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Sequoia
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,304,426us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	1,474,386us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans at Fair Value | Conforming Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans at Fair Value | Jumbo Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans at Lower of Cost or Fair Value
Mortgage Loans on Real Estate [Line Items]
Residential loans	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans Held For Investment at Fair Value | Jumbo Loan
Mortgage Loans on Real Estate [Line Items]
Residential loans	1,304,426us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember	0us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / 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

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

+ Details

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