XML 31 R91.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Business Purpose Residential Loans (Details) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 9 Months Ended | 10 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Feb. 28, 2019 USD ($) | Dec. 31, 2019 USD ($) loan | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) loan | Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  |  |  |  |  | 669 | 1,484 |
Principal amount outstanding on loans securitized | $ 524,928 | $ 1,034,284 |  | $ 524,928 |  | $ 524,928 | $ 524,928 | $ 1,034,284 |
Purchases of held-for-sale loans |  |  |  |  |  |  | 5,823,547 | 7,162,131 | $ 5,705,842
Proceeds from sales of held-for-sale loans |  |  |  |  |  |  | $ 5,198,089 | 5,383,313 | 3,903,147
Number of loans transferred | loan |  |  |  |  |  |  | 3 |  |
Transfers from residential loans to real estate owned |  |  |  |  |  |  | $ 8,609 | $ 4,104 | 4,220
Commitment To Fund Residential Bridge Loan |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Other commitment | $ 173,000 |  |  | 173,000 |  | 173,000 | $ 173,000 |  |
Single-family rental loans, held-for-sale |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan | 201 | 11 |  |  |  |  | 201 | 11 |
Principal amount outstanding on loans securitized | $ 321,636 | $ 27,566 |  | 321,636 |  | 321,636 | $ 321,636 | $ 27,566 |
Residential loans | $ 332,000 | $ 28,000 |  | $ 332,000 |  | $ 332,000 | $ 332,000 | $ 28,000 |
Number of loans in foreclosure | loan | 1 | 0 |  | 1 |  | 1 | 1 | 0 |
Loans held as assets amount in foreclosure | $ 100 |  |  | $ 100 |  | $ 100 | $ 100 |  |
Purchases of held-for-sale loans |  |  | $ 19,000 |  |  | $ 514,000 |  |  |
Gain (loss) on investments |  |  |  |  |  |  | $ 13,000 |  |
Loans maturity one |  |  |  |  |  |  | 5 years |  |
Loans maturity two |  |  |  |  |  |  | 7 years |  |
Loans maturity three |  |  |  |  |  |  | 10 years |  |
Weighted average coupon rate | 4.96% |  |  | 4.96% |  | 4.96% | 4.96% |  |
Contract maturities |  |  |  |  |  |  | 9 years |  |
Weighted average original loan-to-value (LTV) | 69.00% |  |  | 69.00% |  | 69.00% | 69.00% |  |
Weighted-average debt service coverage ratio |  |  |  |  |  |  | 1.43 |  |
Single-family rental loans, held-for-sale | Redwood |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | $ 331,565 | $ 28,460 |  | $ 331,565 |  | $ 331,565 | $ 331,565 | $ 28,460 |
Purchases of held-for-sale loans |  |  |  |  |  |  | 238,000 |  |
Single-family rental loans, held-for-sale | CoreVest LLC |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | $ 0 | 0 |  | 0 |  | 0 | 0 | 0 |
Purchases of held-for-sale loans |  |  |  | 407,000 |  |  |  |  |
Single-family rental loans, held-for-sale | CAFL |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Purchases of held-for-sale loans |  |  |  |  |  |  | 394,000 |  |
Proceeds from sales of held-for-sale loans |  |  |  |  |  |  | $ 20,000 |  |
Single-family rental loans held-for-investment | Redwood |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan | 107 |  |  |  |  |  | 107 |  |
Principal amount outstanding on loans securitized | $ 231,211 |  |  | 231,211 |  | 231,211 | $ 231,211 |  |
Residential loans | $ 237,620 | 0 |  | $ 237,620 |  | $ 237,620 | $ 237,620 | 0 |
Number of loans past due | loan | 0 |  |  | 0 |  | 0 | 0 |  |
Gain (loss) on investments |  |  |  |  |  |  | $ 300 |  |
Loans maturity one |  |  |  |  |  |  | 5 years |  |
Loans maturity two |  |  |  |  |  |  | 7 years |  |
Loans maturity three |  |  |  |  |  |  | 10 years |  |
Weighted average coupon rate | 4.89% |  |  | 4.89% |  | 4.89% | 4.89% |  |
Contract maturities |  |  |  |  |  |  | 7 years |  |
Weighted average original loan-to-value (LTV) | 68.00% |  |  | 68.00% |  | 68.00% | 68.00% |  |
Weighted-average debt service coverage ratio |  |  |  |  |  |  | 1.36 |  |
Single-family rental loans held-for-investment | CoreVest LLC |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | $ 2,192,552 | 0 |  | $ 2,192,552 |  | $ 2,192,552 | $ 2,192,552 | 0 |
Single-family rental loans held-for-investment | CAFL |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan | 783 |  |  |  |  |  | 783 |  |
Principal amount outstanding on loans securitized | $ 2,078,214 |  |  | 2,078,214 |  | 2,078,214 | $ 2,078,214 |  |
Residential loans | $ 2,190,000 |  |  | $ 2,190,000 |  | $ 2,190,000 | $ 2,190,000 |  |
Number of loans in foreclosure | loan | 5 |  |  | 5 |  | 5 | 5 |  |
Loans held as assets amount in foreclosure | $ 9,000 |  |  | $ 9,000 |  | $ 9,000 | $ 9,000 |  |
Purchases of held-for-sale loans |  |  |  |  |  |  | 2,000 |  |
Gain (loss) on investments |  |  |  |  |  |  | $ (15,000) |  |
Loans maturity one |  |  |  |  |  |  | 5 years |  |
Loans maturity two |  |  |  |  |  |  | 7 years |  |
Loans maturity three |  |  |  |  |  |  | 10 years |  |
Weighted average coupon rate | 5.70% |  |  | 5.70% |  | 5.70% | 5.70% |  |
Contract maturities |  |  |  |  |  |  | 7 years |  |
Weighted average original loan-to-value (LTV) | 68.00% |  |  | 68.00% |  | 68.00% | 68.00% |  |
Weighted-average debt service coverage ratio |  |  |  |  |  |  | 1.35 |  |
Single-family rental loans |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from loan originations to third parties |  |  |  |  |  | $ 20,000 |  |  |
Single-family rental loans | Redwood |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | $ 569,185 | 28,460 |  | $ 569,185 |  | 569,185 | $ 569,185 | 28,460 |
Single-family rental loans | CoreVest LLC |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | 2,192,552 | 0 |  | 2,192,552 |  | 2,192,552 | 2,192,552 | 0 |
Residential Bridge, Held-for-sale at fair value |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | $ 0 | $ 0 |  | 0 |  | 0 | $ 0 | $ 0 |
Residential Bridge, Held-for-investment at fair value |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan | 2,653 | 157 |  |  |  |  | 2,653 | 157 |
Principal amount outstanding on loans securitized | $ 741,232 | $ 112,360 |  | 741,232 |  | 741,232 | $ 741,232 | $ 112,360 |
Residential loans | $ 745,006 | $ 112,798 |  | $ 745,006 |  | $ 745,006 | $ 745,006 | $ 112,798 |
Number of loans in foreclosure | loan | 31 | 4 |  | 31 |  | 31 | 31 | 4 |
Loans held as assets amount in foreclosure | $ 14,000 | $ 11,000 |  | $ 14,000 |  | $ 14,000 | $ 14,000 | $ 11,000 |
Purchases of held-for-sale loans |  |  | $ 10,000 |  |  | $ 448,000 |  |  |
Gain (loss) on investments |  |  |  |  |  |  | $ (2,000) |  |
Weighted average coupon rate | 8.11% |  |  | 8.11% |  | 8.11% | 8.11% |  |
Weighted average original loan-to-value (LTV) | 70.00% |  |  | 70.00% |  | 70.00% | 70.00% |  |
Aggregate fair value, delinquent or in foreclosure | $ 12,000 |  |  | $ 12,000 |  | $ 12,000 | $ 12,000 |  |
Transfers from residential loans to real estate owned |  |  |  |  |  |  | $ 8,000 |  |
Weighted average original Fair Isaac Corporation (FICO) score | 732 |  |  | 732 |  | 732 | 732 |  |
Residential Bridge, Held-for-investment at fair value | Minimum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Contract maturities |  |  |  |  |  |  | 6 months |  |
Residential Bridge, Held-for-investment at fair value | Maximum |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Contract maturities |  |  |  |  |  |  | 24 months |  |
Residential Bridge, Held-for-investment at fair value | CoreVest LLC |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Purchases of held-for-sale loans |  |  |  | $ 375,000 |  |  |  |  |
Residential bridge loans |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from loan originations to third parties |  |  |  |  |  | $ 56,000 |  |  |
Residential loans | $ 745,006 | 112,798 |  | 745,006 |  | 745,006 | $ 745,006 | 112,798 |
Held-for-sale at fair value, Total |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | 331,565 | 28,460 |  | 331,565 |  | 331,565 | 331,565 | 28,460 |
Held-for-investment at fair value, Total |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Residential loans | 3,175,178 | 112,798 |  | 3,175,178 |  | 3,175,178 | 3,175,178 | 112,798 |
Business purpose residential loans |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Fee income |  |  |  |  |  | 16,000 |  |  |
Residential loans | $ 3,506,743 | $ 141,258 |  | $ 3,506,743 |  | $ 3,506,743 | $ 3,506,743 | $ 141,258 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Single-family rental loans, held-for-sale |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans past due | loan | 2 | 0 |  | 2 |  | 2 | 2 | 0 |
Loans held as assets, 90 days or more past due |  | $ 2,000 |  |  |  |  |  | $ 2,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due | Single-family rental loans held-for-investment | CAFL |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans past due | loan | 18 |  |  | 18 |  | 18 | 18 |  |
Loans held as assets, 90 days or more past due | $ 29,000 |  |  | $ 29,000 |  | $ 29,000 | $ 29,000 |  |
Financing Receivables, Equal to Greater than 90 Days Past Due | Residential Bridge, Held-for-investment at fair value |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Number of loans past due | loan | 15 | 7 |  | 15 |  | 15 | 15 | 7 |
Loans held as assets, 90 days or more past due | $ 9,000 | $ 12,000 |  | $ 9,000 |  | $ 9,000 | $ 9,000 | $ 12,000 |
Aggregate fair value, delinquent or in foreclosure | $ 7,000 |  |  | $ 7,000 |  | 7,000 | 7,000 |  |
Residential bridge loans | Business Purpose Mortgage Banking |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Changes in fair value of assets |  |  |  |  | $ 5,000 |  | $ 4,518 | $ 0 | $ 0
Business purpose residential loans |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from loan originations |  |  |  |  |  | $ 1,020,000 |  |  |

X
- Definition Fair Value, Option, Loans Held As Assets, Aggregate Amount In Foreclosure + References No definition available. + Details
Name: | rwt_FairValueOptionLoansHeldAsAssetsAggregateAmountInForeclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing Receivable, Contract Maturities + References No definition available. + Details
Name: | rwt_FinancingReceivableContractMaturities
Namespace Prefix: | rwt_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_FinancingReceivableCreditScoreFICOWeightedAverage
Namespace Prefix: | rwt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Financing Receivable, Number Of Loans In Foreclosure + References No definition available. + Details
Name: | rwt_FinancingReceivableNumberOfLoansInForeclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Financing Receivable, Number Of Loans Past Due + References No definition available. + Details
Name: | rwt_FinancingReceivableNumberOfLoansPastDue
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Financing Receivable, Weighted Average Debt Service Coverage Ratio + References No definition available. + Details
Name: | rwt_FinancingReceivableWeightedAverageDebtServiceCoverageRatio
Namespace Prefix: | rwt_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivables, Weighted Average Interest Rate + References No definition available. + Details
Name: | rwt_FinancingReceivablesWeightedAverageInterestRate
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Increase (Decrease) in Fair Value Adjustments on Assets + References No definition available. + Details
Name: | rwt_IncreaseDecreaseinFairValueAdjustmentsonAssets
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loans And Leases Receivable, Delinquent Or In Foreclosure + References No definition available. + Details
Name: | rwt_LoansAndLeasesReceivableDelinquentOrInForeclosure
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Loans Held-For-Sale, Maturity One + References No definition available. + Details
Name: | rwt_LoansHeldForSaleMaturityOne
Namespace Prefix: | rwt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Held-For-Sale, Maturity Three + References No definition available. + Details
Name: | rwt_LoansHeldForSaleMaturityThree
Namespace Prefix: | rwt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loans Held-For-Sale, Maturity Two + References No definition available. + Details
Name: | rwt_LoansHeldForSaleMaturityTwo
Namespace Prefix: | rwt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Proceeds from Loan Originations, Including To Related Parties + References No definition available. + Details
Name: | rwt_ProceedsfromLoanOriginationsIncludingToRelatedParties
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Real Estate Owned, Transfer to Real Estate Owned, Number Of Loans + References No definition available. + Details
Name: | rwt_RealEstateOwnedTransfertoRealEstateOwnedNumberOfLoans
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Servicing Fees 1 + References No definition available. + Details
Name: | rwt_ServicingFees1
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of mortgage loans within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Footnote 3 -Subsection 29 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 3)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
Name: | srt_MortgageLoansOnRealEstateNumberOfLoans
Namespace Prefix: | srt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the aggregate fair value of loans held as assets that are 90 days or more past due for which the fair value option has been elected. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
Name: | us-gaap_FairValueOptionLoansHeldAsAssets90DaysOrMorePastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of realized and unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
Name: | us-gaap_GainLossOnInvestments
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 loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetReportedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
Name: | us-gaap_OtherCommitment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The aggregate cash outflow used to purchase all loans that are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3461-108585 + Details
Name: | us-gaap_PaymentsToPurchaseLoansHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118948506&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromLoanOriginations1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3337-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3461-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfLoansHeldForSale
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value transferred from mortgage loans to real estate owned (REO) in noncash transactions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
Name: | us-gaap_TransferToOtherRealEstate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=rwt_CommitmentToFundResidentialBridgeLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_SingleFamilyRentalLoansHeldForSaleAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=rwt_RedwoodTrustInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=rwt_CoreVestAmericanFinanceLenderLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=rwt_CAFLSecuritizationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_SingleFamilyRentalLoansHeldForInvestmentAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_SingleFamilyRentalLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_ResidentialBridgeHeldForSaleAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_ResidentialBridgeLoansHeldForInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_ResidentialBridgeLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_LoansHeldForSaleAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_LoansHeldForInvestmentAtFairValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=rwt_BusinessPurposeResidentialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_ResidentialBridgeLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rwt_BusinessPurposeMortgageBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_BusinessPurposeResidentialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |