XML 49 R71.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Residential Loans - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 Contract CreditScore | Dec. 31, 2013 Contract | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | $ 3,398,573,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer | $ 2,166,434,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer | $ 2,835,470,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Residential Loans Held for Investment |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | 1,474,386,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 1,762,167,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Number of Loans | 5,315 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 6,206 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Principal value | 1,483,213,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 1,770,803,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Unamortized premium, net | 13,000,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 17,000,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |
Weighted average original loan-to-value (LTV) | 66.00%rwt_LoanToValueRatio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |  |
Weighted average original Fair Isaac Corporation (FICO) score | 733 rwt_WeightedAverageCreditScore / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember |  |
Charge-offs, net | 5,000,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 5,000,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 12,000,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember
Principal value | 21,000,000 rwt_DefaultedLoanPrincipalDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 14,000,000 rwt_DefaultedLoanPrincipalDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember | 33,000,000 rwt_DefaultedLoanPrincipalDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember
Residential Loans Held for Investment | Residential Loans Acquired Prior To July 1st 2004 |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Principal value | 598,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredPriorToJulyOneTwentyZeroFourMember | 731,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredPriorToJulyOneTwentyZeroFourMember |
Unamortized premium, net | 8,000,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredPriorToJulyOneTwentyZeroFourMember | 11,000,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredPriorToJulyOneTwentyZeroFourMember |
Percentage of loans prepaid | 18.00%rwt_PercentageOfLoansPrepaid / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredPriorToJulyOneTwentyZeroFourMember |  |
Percentage of premiums amortized | 30.00%rwt_PercentageOfLoanPremiumsAmortized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredPriorToJulyOneTwentyZeroFourMember |  |
Residential Loans Held for Investment | Residential Loans Acquired After July 1st 2004 |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Principal value | 889,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredAfterJulyOneTwentyZeroFourMember | 1,040,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredAfterJulyOneTwentyZeroFourMember |
Unamortized premium, net | 5,000,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredAfterJulyOneTwentyZeroFourMember | 6,000,000 us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredAfterJulyOneTwentyZeroFourMember |
Percentage of loans prepaid | 15.00%rwt_PercentageOfLoansPrepaid / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredAfterJulyOneTwentyZeroFourMember |  |
Percentage of premiums amortized | 18.00%rwt_PercentageOfLoanPremiumsAmortized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis = rwt_ResidentialLoansAcquiredAfterJulyOneTwentyZeroFourMember |  |
Residential Loans Held for Investment | First Mortgage |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Percentage of loan portfolio | 99.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_FirstMortgageMember |  |
Residential Loans Held for Investment | Second Mortgage |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Percentage of loan portfolio | 1.00%rwt_PercentageOfLoanPortfolio / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentMember / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_SecondMortgageMember |  |
Residential Loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Principal value | 8,810,000,000 rwt_PrincipalBalanceOfLoansAcquiredDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 7,010,000,000 rwt_PrincipalBalanceOfLoansAcquiredDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember |
Charge-offs, net | 4,966,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 4,525,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 11,903,000 us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Loss confirmation period | 23 months |  |
Average recorded investment of loans individually evaluated for impairment | 13,000,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 7,000,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 14,000,000 us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Interest income recognized on impaired loans | 129,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 123,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember | 297,000 us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ResidentialMortgageMember
Residential Loans at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | 1,340,000,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember | 403,000,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |
Number of Loans | 2,273 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember | 537 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |
Principal value | 1,300,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember | 399,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember |
Negative Valuation adjustments | 51,256,000 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember | (10,493,000)us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember | 37,762,000 us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtFairValueMember
Residential Loans at Lower of Cost or Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | 1,488,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 1,665,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Number of Loans | 9 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 10 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Principal value | 2,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 2,000,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Valuation adjustments | 56,000 us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 38,000 us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Residential Loans at Lower of Cost or Fair Value | Carrying Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | 2,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember | 2,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansAtLowerOfCostOrFairValueMember |
Residential Loans Held For Investment at Fair Value |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | 581,668,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |  |
Number of Loans | 804 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |  |
Principal value | 566,372,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |  |
Principal balance of loans transferred | 574,000,000 rwt_PrincipalAmountOfLoansSecuritizedDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |  |
Fair value of loans transferred | 564,000,000 rwt_FairValueOfLoansSecuritizedDuringPeriod / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember |  |
Residential Loans Held For Sale |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | 1,342,519,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember | 404,267,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember |
Number of Loans | 2,282 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember | 547 us-gaap_MortgageLoansOnRealEstateNumberOfLoans / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember |
Principal value | 1,305,493,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember | 400,873,000 us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember |
Residential Loans Held For Sale | Mortgage Servicing Rights |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying value | $ 1,700,000,000 us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_ResidentialLoansHeldForSaleMember / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  |

X
- Definition Defaulted Loan Principal During Period + References No definition available. + Details
Name: | rwt_DefaultedLoanPrincipalDuringPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair Value Of Loans Securitized During Period + References No definition available. + Details
Name: | rwt_FairValueOfLoansSecuritizedDuringPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loan To Value Ratio + References No definition available. + Details
Name: | rwt_LoanToValueRatio
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loss Confirmation Period + References No definition available. + Details
Name: | rwt_LossConfirmationPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Loan Portfolio + References No definition available. + Details
Name: | rwt_PercentageOfLoanPortfolio
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage Of Loan Premiums Amortized + References No definition available. + Details
Name: | rwt_PercentageOfLoanPremiumsAmortized
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Loans Prepaid + References No definition available. + Details
Name: | rwt_PercentageOfLoansPrepaid
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Principal Amount Of Loans Securitized During Period + References No definition available. + Details
Name: | rwt_PrincipalAmountOfLoansSecuritizedDuringPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Principal Balance of Loans Acquired During Period + References No definition available. + Details
Name: | rwt_PrincipalBalanceOfLoansAcquiredDuringPeriod
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The weighted average FICO score for borrowers at the time loans were originated. + References No definition available. + Details
Name: | rwt_WeightedAverageCreditScore
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + References Reference 1: 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(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524 + Details
Name: | us-gaap_AllowanceForLoanAndLeaseLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
Name: | us-gaap_FairValueOptionChangesInFairValueGainLoss1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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
Name: | us-gaap_LoansAndLeasesReceivableNetReportedAmountConsumer
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Indicates the number of mortgages under each classification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Paragraph 3 -Article 12 + Details
Name: | us-gaap_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total periodic movement (increases and decreases) in the carrying amount of mortgage loans on real estate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstatePeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for 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 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
Name: | us-gaap_UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansAtLowerOfCostOrFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansHeldForInvestmentAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansHeldForInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |