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Fair Value of Financial Instruments - Quantitative Information about Significant Unobservable Inputs Used in Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) $ / loan | Dec. 31, 2019 USD ($) | Sep. 30, 2019
Assets |  |  |
ABS issued, net, Fair value | $ | $ 6,969,376 | $ 10,515,475 |
ABS Issued |  |  |
Liabilities |  |  |
ABS issued | $ | $ 1,919,048 |  |
ABS Issued | Prepayment rate (annual CPR) | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.05 |  |
ABS Issued | Prepayment rate (annual CPR) | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.53 |  |
ABS Issued | Prepayment rate (annual CPR) | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.27 |  |
ABS Issued | Discount rate | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.02 |  |
ABS Issued | Discount rate | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.30 |  |
ABS Issued | Discount rate | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.03 |  |
ABS Issued | Default rate | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0 |  |
ABS Issued | Default rate | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.40 |  |
ABS Issued | Default rate | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.02 |  |
ABS Issued | Loss severity | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0 |  |
ABS Issued | Loss severity | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.50 |  |
ABS Issued | Loss severity | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.31 |  |
Freddie Mac SLST |  |  |
Liabilities |  |  |
ABS issued | $ | $ 1,841,313 |  |
Freddie Mac K-Series |  |  |
Liabilities |  |  |
ABS issued | $ | $ 464,865 |  |
Freddie Mac K-Series | Discount rate | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.01 |  |
Freddie Mac K-Series | Discount rate | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.18 |  |
Freddie Mac K-Series | Discount rate | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.02 |  |
Freddie Mac K-Series | Dollar price | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 1 |  |
Freddie Mac K-Series | Dollar price | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 108 |  |
Freddie Mac K-Series | Dollar price | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 99 |  |
CAFL |  |  |
Liabilities |  |  |
ABS issued | $ | $ 2,744,150 |  |
CAFL | Prepayment rate (annual CPR) | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0 |  |
CAFL | Prepayment rate (annual CPR) | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.03 |  |
CAFL | Prepayment rate (annual CPR) | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0 |  |
CAFL | Discount rate | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.002 |  |
CAFL | Discount rate | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.40 |  |
CAFL | Discount rate | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.03 |  |
CAFL | Default rate | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0 |  |
CAFL | Default rate | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.18 |  |
CAFL | Default rate | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.11 |  |
CAFL | Loss severity | Minimum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.30 |  |
CAFL | Loss severity | Maximum |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.30 |  |
CAFL | Loss severity | Weighted Average |  |  |
Liabilities |  |  |
ABS issued, measurement input | 0.30 |  |
Jumbo fixed-rate loans |  |  |
Assets |  |  |
ABS issued, net, Fair value | $ | $ 6,312 |  |
Jumbo fixed-rate loans | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 0.20 |  |
Jumbo fixed-rate loans | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 0.20 |  |
Jumbo fixed-rate loans | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 0.20 |  |
Jumbo fixed-rate loans | Whole loan spread to swap rate | Minimum |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 0.0350 |  |
Jumbo fixed-rate loans | Whole loan spread to swap rate | Maximum |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 0.0350 |  |
Jumbo fixed-rate loans | Whole loan spread to swap rate | Weighted Average |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 0.0350 |  |
Jumbo loans committed to sell |  |  |
Assets |  |  |
Loans receivable, fair value | $ | $ 98,779 |  |
Jumbo loans committed to sell | Whole loan committed sales price | Minimum |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 101.61 |  |
Jumbo loans committed to sell | Whole loan committed sales price | Maximum |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 103.40 |  |
Jumbo loans committed to sell | Whole loan committed sales price | Weighted Average |  |  |
Assets |  |  |
Loans held-for-sale, measurement input | 103.23 |  |
Legacy Sequoia |  |  |
Assets |  |  |
Loans receivable, fair value | $ | $ 296,765 |  |
Sequoia Choice |  |  |
Assets |  |  |
Loans receivable, fair value | $ | 1,836,361 |  |
Liabilities |  |  |
Fair value of securities owned | $ | 215,000 |  |
Freddie Mac SLST |  |  |
Assets |  |  |
Loans receivable, fair value | $ | 2,256,682 |  |
Liabilities |  |  |
Fair value of securities owned | $ | 416,000 |  |
Single-family rental loans |  |  |
Assets |  |  |
Loans receivable, fair value | $ | $ 285,549 |  |
Single-family rental loans | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0 |  |
Single-family rental loans | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.03 |  |
Single-family rental loans | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.03 |  |
Single-family rental loans | Senior credit spread | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0130 |  |
Single-family rental loans | Senior credit spread | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0130 |  |
Single-family rental loans | Senior credit spread | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0130 |  |
Single-family rental loans | Subordinate credit spread | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0200 |  |
Single-family rental loans | Subordinate credit spread | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.1600 |  |
Single-family rental loans | Subordinate credit spread | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0551 |  |
Single-family rental loans | Senior credit support | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.30 |  |
Single-family rental loans | Senior credit support | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.32 |  |
Single-family rental loans | Senior credit support | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.31 |  |
Single-family rental loans | IO discount rate | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.08 |  |
Single-family rental loans | IO discount rate | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.09 |  |
Single-family rental loans | IO discount rate | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.09 |  |
Single-family rental loans | Non-securitizable loan dollar price | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 101 |  |
Single-family rental loans | Non-securitizable loan dollar price | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 101 |  |
Single-family rental loans | Non-securitizable loan dollar price | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 101 |  |
CAFL |  |  |
Assets |  |  |
Loans receivable, fair value | $ | $ 2,969,692 |  |
Liabilities |  |  |
Fair value of securities owned | $ | 229,000 |  |
Residential bridge loans |  |  |
Assets |  |  |
Loans receivable, fair value | $ | $ 700,860 |  |
Residential bridge loans | Discount rate | Minimum |  |  |
Assets |  |  |
Loans held-for-investment, measurement input | 0.06 |  |
Residential bridge loans | Discount rate | Maximum |  |  |
Assets |  |  |
Loans held-for-investment, measurement input | 0.12 |  |
Residential bridge loans | Discount rate | Weighted Average |  |  |
Assets |  |  |
Loans held-for-investment, measurement input | 0.08 |  |
Residential bridge loans | Non-performing loan dollar price | Minimum |  |  |
Assets |  |  |
Loans held-for-investment, measurement input | 3 |  |
Residential bridge loans | Non-performing loan dollar price | Maximum |  |  |
Assets |  |  |
Loans held-for-investment, measurement input | 100 |  |
Residential bridge loans | Non-performing loan dollar price | Weighted Average |  |  |
Assets |  |  |
Loans held-for-investment, measurement input | 89 |  |
Freddie Mac K-Series |  |  |
Assets |  |  |
Loans receivable, fair value | $ | $ 491,415 |  |
Liabilities |  |  |
Fair value of securities owned | $ | 27,000 |  |
Trading and AFS securities |  |  |
Assets |  |  |
Trading and AFS securities | $ | $ 351,335 |  |
Trading and AFS securities | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Trading and AFS securities | 0.07 |  |
Trading and AFS securities | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Trading and AFS securities | 0.65 |  |
Trading and AFS securities | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Trading and AFS securities | 0.24 |  |
Trading and AFS securities | Discount rate | Minimum |  |  |
Assets |  |  |
Trading and AFS securities | 0.03 |  |
Trading and AFS securities | Discount rate | Maximum |  |  |
Assets |  |  |
Trading and AFS securities | 0.34 |  |
Trading and AFS securities | Discount rate | Weighted Average |  |  |
Assets |  |  |
Trading and AFS securities | 0.09 |  |
Trading and AFS securities | Default rate | Minimum |  |  |
Assets |  |  |
Trading and AFS securities | 0 |  |
Trading and AFS securities | Default rate | Maximum |  |  |
Assets |  |  |
Trading and AFS securities | 0.26 |  |
Trading and AFS securities | Default rate | Weighted Average |  |  |
Assets |  |  |
Trading and AFS securities | 0.01 |  |
Trading and AFS securities | Loss severity | Minimum |  |  |
Assets |  |  |
Trading and AFS securities | 0 |  |
Trading and AFS securities | Loss severity | Maximum |  |  |
Assets |  |  |
Trading and AFS securities | 0.50 |  |
Trading and AFS securities | Loss severity | Weighted Average |  |  |
Assets |  |  |
Trading and AFS securities | 0.19 |  |
Trading and AFS securities | Measurement Input, CRT Dollar Price | Minimum |  |  |
Assets |  |  |
Trading and AFS securities | 49 |  |
Trading and AFS securities | Measurement Input, CRT Dollar Price | Maximum |  |  |
Assets |  |  |
Trading and AFS securities | 103 |  |
Trading and AFS securities | Measurement Input, CRT Dollar Price | Weighted Average |  |  |
Assets |  |  |
Trading and AFS securities | 84 |  |
Servicer advance investments |  |  |
Assets |  |  |
Servicing asset | $ | $ 258,621 |  |
Servicer advance investments | Minimum |  |  |
Assets |  |  |
Expected remaining life | 1 year |  |
Servicer advance investments | Maximum |  |  |
Assets |  |  |
Expected remaining life | 2 years |  |
Servicer advance investments | Weighted Average |  |  |
Assets |  |  |
Expected remaining life | 2 years |  |
Servicer advance investments | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.08 |  |
Servicer advance investments | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.14 |  |
Servicer advance investments | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.13 |  |
Servicer advance investments | Discount rate | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.03 |  |
Servicer advance investments | Discount rate | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.04 |  |
Servicer advance investments | Discount rate | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.04 |  |
Loan purchase and interest rate lock commitments |  |  |
Liabilities |  |  |
Loan purchase commitments, net | $ | $ 10,282 |  |
Loan purchase and interest rate lock commitments | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.15 |  |
Loan purchase and interest rate lock commitments | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.15 |  |
Loan purchase and interest rate lock commitments | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.15 |  |
Loan purchase and interest rate lock commitments | Whole loan spread to swap rate | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0350 |  |
Loan purchase and interest rate lock commitments | Whole loan spread to swap rate | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0350 |  |
Loan purchase and interest rate lock commitments | Whole loan spread to swap rate | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.0350 |  |
Loan purchase and interest rate lock commitments | Mortgage servicing income | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.0006 |  |
Loan purchase and interest rate lock commitments | Mortgage servicing income | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.0016 |  |
Loan purchase and interest rate lock commitments | Mortgage servicing income | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.0008 |  |
Loan purchase and interest rate lock commitments | Committed sales price | Minimum |  |  |
Liabilities |  |  |
Loan purchase commitments, measurement input | 100.89 |  |
Loan purchase and interest rate lock commitments | Committed sales price | Maximum |  |  |
Liabilities |  |  |
Loan purchase commitments, measurement input | 103.40 |  |
Loan purchase and interest rate lock commitments | Committed sales price | Weighted Average |  |  |
Liabilities |  |  |
Loan purchase commitments, measurement input | 102.59 |  |
Loan purchase and interest rate lock commitments | Pull-through rate | Minimum |  |  |
Liabilities |  |  |
Loan purchase commitments, measurement input | 0.13 |  |
Loan purchase and interest rate lock commitments | Pull-through rate | Maximum |  |  |
Liabilities |  |  |
Loan purchase commitments, measurement input | 1 |  |
Loan purchase and interest rate lock commitments | Pull-through rate | Weighted Average |  |  |
Liabilities |  |  |
Loan purchase commitments, measurement input | 0.58 |  |
Loan purchase and interest rate lock commitments | MSR Multiple | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 0.8 |  |
Loan purchase and interest rate lock commitments | MSR Multiple | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 4.1 |  |
Loan purchase and interest rate lock commitments | MSR Multiple | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 3.4 |  |
Loan purchase and interest rate lock commitments | Whole Loan Spread to TBA Price | Minimum |  |  |
Assets |  |  |
Loans receivable, measurement input | 2.00 |  |
Loan purchase and interest rate lock commitments | Whole Loan Spread to TBA Price | Maximum |  |  |
Assets |  |  |
Loans receivable, measurement input | 2.00 |  |
Loan purchase and interest rate lock commitments | Whole Loan Spread to TBA Price | Weighted Average |  |  |
Assets |  |  |
Loans receivable, measurement input | 2.00 |  |
MSRs |  |  |
Assets |  |  |
Servicing asset | $ | $ 14,878 |  |
MSRs | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.08 |  |
MSRs | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.97 |  |
MSRs | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.26 |  |
MSRs | Discount rate | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.12 |  |
MSRs | Discount rate | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.12 |  |
MSRs | Discount rate | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.12 |  |
MSRs | Per loan annual cost to service | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 95 |  |
MSRs | Per loan annual cost to service | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 95 |  |
MSRs | Per loan annual cost to service | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 95 |  |
Excess MSRs |  |  |
Assets |  |  |
Servicing asset | $ | $ 35,070 |  |
Excess MSRs | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.10 |  |
Excess MSRs | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.13 |  |
Excess MSRs | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.11 |  |
Excess MSRs | Discount rate | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.15 |  |
Excess MSRs | Discount rate | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.21 |  |
Excess MSRs | Discount rate | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.18 |  |
Excess MSRs | Excess mortgage servicing income | Minimum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.0009 |  |
Excess MSRs | Excess mortgage servicing income | Maximum |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.0017 |  |
Excess MSRs | Excess mortgage servicing income | Weighted Average |  |  |
Assets |  |  |
Servicing asset, measurement input | 0.0012 |  |
Shared home appreciation options |  |  |
Assets |  |  |
Shared home appreciation options | $ | $ 41,758 |  |
Shared home appreciation options | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Shared home appreciation options |  |  | 0.08
Shared home appreciation options | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Shared home appreciation options |  |  | 0.26
Shared home appreciation options | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Shared home appreciation options |  |  | 0.19
Shared home appreciation options | Discount rate | Minimum |  |  |
Assets |  |  |
Shared home appreciation options | 0.16 |  |
Shared home appreciation options | Discount rate | Maximum |  |  |
Assets |  |  |
Shared home appreciation options | 0.16 |  |
Shared home appreciation options | Discount rate | Weighted Average |  |  |
Assets |  |  |
Shared home appreciation options | 0.16 |  |
Shared home appreciation options | Home price appreciation | Minimum |  |  |
Assets |  |  |
Shared home appreciation options |  |  | 0.02
Shared home appreciation options | Home price appreciation | Maximum |  |  |
Assets |  |  |
Shared home appreciation options |  |  | 0.03
Shared home appreciation options | Home price appreciation | Weighted Average |  |  |
Assets |  |  |
Shared home appreciation options |  |  | 0.03
Guarantee asset |  |  |
Assets |  |  |
Guarantee asset | $ | $ 579 |  |
Guarantee asset | Prepayment rate (annual CPR) | Minimum |  |  |
Assets |  |  |
Guarantee asset | 0.42 |  |
Guarantee asset | Prepayment rate (annual CPR) | Maximum |  |  |
Assets |  |  |
Guarantee asset | 0.42 |  |
Guarantee asset | Prepayment rate (annual CPR) | Weighted Average |  |  |
Assets |  |  |
Guarantee asset | 0.42 |  |
Guarantee asset | Discount rate | Minimum |  |  |
Assets |  |  |
Guarantee asset | 0.12 |  |
Guarantee asset | Discount rate | Maximum |  |  |
Assets |  |  |
Guarantee asset | 0.12 |  |
Guarantee asset | Discount rate | Weighted Average |  |  |
Assets |  |  |
Guarantee asset | 0.12 |  |
REO |  |  |
Assets |  |  |
REO | $ | $ 3,523 |  |
REO | Loss severity | Minimum |  |  |
Assets |  |  |
REO, measurement input | 0.03 |  |
REO | Loss severity | Maximum |  |  |
Assets |  |  |
REO, measurement input | 0.63 |  |
REO | Loss severity | Weighted Average |  |  |
Assets |  |  |
REO, measurement input | 0.23 |  |

X
- Definition Debt Securities, Trading And Available-for-sale, Fair Value Disclosure + References No definition available. + Details
Name: | rwt_DebtSecuritiesTradingAndAvailableforsaleFairValueDisclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Debt Securities, Trading And Available-for-sale, Measurement Input + References No definition available. + Details
Name: | rwt_DebtSecuritiesTradingAndAvailableforsaleMeasurementInput
Namespace Prefix: | rwt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Guarantee Asset, Measurement Input + References No definition available. + Details
Name: | rwt_GuaranteeAssetMeasurementInput
Namespace Prefix: | rwt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Guarantees Asset, Fair Value Disclosure + References No definition available. + Details
Name: | rwt_GuaranteesAssetFairValueDisclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Home Appreciation Options, Fair value Disclosure + References No definition available. + Details
Name: | rwt_HomeAppreciationOptionsFairvalueDisclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Home Appreciation Options, Measurement Input + References No definition available. + Details
Name: | rwt_HomeAppreciationOptionsMeasurementInput
Namespace Prefix: | rwt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loan Purchase Commitments, Fair Value Disclosure + References No definition available. + Details
Name: | rwt_LoanPurchaseCommitmentsFairValueDisclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Held-for-Investment, Measurement Input + References No definition available. + Details
Name: | rwt_LoansHeldForInvestmentMeasurementInput
Namespace Prefix: | rwt_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Loans Receivable, Measurement Input + References No definition available. + Details
Name: | rwt_LoansReceivableMeasurementInput
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