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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
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Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | $ 3,399,755 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer | $ 3,398,573 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Residential Loans at Fair Value | Conforming Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 200,869 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember | 244,714 us-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 | 892,544 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember | 1,096,317 us-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 | 1,472 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 1,488 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
Residential Loans Held For Investment at Fair Value |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,000,000 us-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 | 2,304,870 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember | 581,668 us-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 |  | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember
Redwood |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 2,095,329 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 1,924,187 us-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 | 200,869 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 244,714 us-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 | 892,544 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 1,096,317 us-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 | 1,472 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 1,488 us-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 | 1,000,444 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember | 581,668 us-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 |  | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = us-gaap_ParentCompanyMember
Sequoia |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 1,304,426 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Sequoia | Residential Loans at Fair Value | Conforming Loan |  |
Mortgage Loans on Real Estate [Line Items] |  |
Residential loans | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_ConformingLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 0 us-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 | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 0 us-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 | 0 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 0 us-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 | 1,304,426 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_MortgageLoansOnRealEstateLoanTypeAxis = rwt_JumboLoanMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember | 0 us-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 |  | $ 1,474,386 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtAmortizedCostMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember

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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 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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