XML 97 R85.htm IDEA: XBRL DOCUMENT
v3.21.2

Business Purpose Loans - Activity and Characteristics of Business Purpose Loans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) loan
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Purchases of held-for-sale loans |  |  | $ 9,902,028 | $ 2,893,246 |
Principal balance of loans sold to third parties |  |  | 46,904 | 19,446 |
Transfers from loans held-for-sale to loans held-for-investment |  |  | 3,005,041 | 770,754 |
Transfers from loans held-for-investment to loans held-for-sale |  |  | $ 44,922 | 0 |
Adjustable rate (as a percent) |  |  | 69.00% |  |
Fixed rate (as a percent) |  |  | 31.00% |  |
Transfers from residential loans to real estate owned |  |  | $ 21,655 | 12,547 |
Amount related to transfers into REO |  |  | $ 21,654 |  |
CAFL |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans transferred | loan |  |  | 3 |  |
Amount related to transfers into REO |  |  | $ 11,924 |  |
Commitment To Fund Residential Bridge Loan |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Commitment to fund loan | $ 426,000 |  | 426,000 |  |
Single-family rental loans, held-for-sale | Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Purchases of held-for-sale loans | 392,620 | $ 195,744 | 957,935 | 631,749 |
Principal balance of loans acquired | 2,463 | 0 | 2,463 | 0 |
Principal balance of loans sold to third parties | 0 | 7,695 | 0 | 33,843 |
Transfers from loans held-for-sale to loans held-for-investment | 332,670 | 326,405 | 799,375 | 925,437 |
Transfers from loans held-for-investment to loans held-for-sale | 0 | 0 | 44,922 | 0 |
Gain (loss) on investments | 0 | 0 | 0 | (20,806) |
Fair value of loans | 466,346 |  | 466,346 |  | $ 245,394
Single-family rental loans, held-for-sale | Redwood | Business Purpose Mortgage Banking Activities, Net: |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 19,205 | 43,191 | 54,675 | 54,731 |
Single Family Rental Loans Held For Investment At Fair Value | Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Fair value of loans | 0 |  | 0 |  | $ 0
Single Family Rental Loans Held For Investment At Fair Value | CAFL |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | $ (34,803) | 88,271 | (96,934) | (14,319) |
Number of loans | loan | 1,157 |  |  |  | 1,094
Unpaid principal balance | $ 3,207,118 |  | 3,207,118 |  | $ 3,017,137
Fair value of loans | $ 3,402,411 |  | $ 3,402,411 |  | $ 3,249,194
Weighted average coupon rate | 5.27% |  | 5.27% |  | 5.44%
Contract maturities | 6 years |  |  |  | 5 years
Fair value of loans with 90+ day delinquencies | $ 22,004 |  | $ 22,004 |  | $ 24,745
Number of loans in foreclosure | loan | 10 |  | 10 |  | 10
Single Family Rental Loans Held For Investment At Fair Value | CAFL | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans with 90+ day delinquencies | loan | 15 |  | 15 |  | 22
Fair value of loans with 90+ day delinquencies | $ 39,423 |  | $ 39,423 |  | $ 61,440
Bridge Loans Held For Investment At Fair Value | CAFL |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 0 | 0 | 0 | 0 |
Bridge loans held-for-investment |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Purchases of held-for-sale loans | 208,938 | 65,517 | 557,327 | 351,353 |
Principal balance of loans acquired | 35,713 | 0 | 35,713 | 0 |
Principal balance of loans sold to third parties | 253 | 1,567 | 9,484 | 23,860 |
Gain (loss) on investments | 900 | 6,812 | 4,142 | (10,016) |
Fair value of loans | 548,445 |  | 548,445 |  | 641,765
Bridge loans held-for-investment | Business Purpose Mortgage Banking Activities, Net: |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 3,691 | 29 | 5,212 | (3,412) |
Bridge loans held-for-investment | Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Transfers from loans held-for-sale to loans held-for-investment | 276,354 |  | 276,354 |  |
Business Purpose Loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Fee income | 9,000 | $ 3,000 | 22,000 | $ 13,000 |
Fair value of loans | $ 4,693,555 |  | 4,693,555 |  | $ 4,136,353
Single-Family Rental Loans, Held-For-Sale | Redwood |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans | loan | 123 |  |  |  | 65
Unpaid principal balance | $ 451,295 |  | 451,295 |  | $ 234,475
Fair value of loans | $ 466,346 |  | $ 466,346 |  | $ 245,394
Weighted average coupon rate | 4.57% |  | 4.57% |  | 4.84%
Contract maturities | 7 years |  |  |  | 8 years
Fair value of loans with 90+ day delinquencies | $ 4,978 |  | $ 4,978 |  | $ 0
Number of loans in foreclosure | loan | 6 |  | 6 |  | 0
Unpaid principal balance of loans in foreclosure | $ 2,619 |  | $ 2,619 |  | $ 0
Single-Family Rental Loans, Held-For-Sale | Redwood | Loans Pledged As Collateral, Short Term Debt |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 127,930 |  |  |  | 34,098
Single-Family Rental Loans, Held-For-Sale | Redwood | Loans Pledged As Collateral, Long Term debt |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 298,014 |  |  |  | 154,774
Single-Family Rental Loans, Held-For-Sale | Redwood | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Fair value of loans | $ 2,664 |  | $ 2,664 |  | $ 6,143
Number of loans with 90+ day delinquencies | loan | 7 |  | 7 |  | 10
Fair value of loans with 90+ day delinquencies | $ 5,067 |  | $ 5,067 |  | $ 7,127
Business Purpose Bridge Loans |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans | loan | 1,092 |  |  |  | 1,725
Unpaid principal balance | $ 550,711 |  | 550,711 |  | $ 649,532
Fair value of loans | $ 548,445 |  | $ 548,445 |  | $ 641,765
Weighted average coupon rate | 7.48% |  | 7.48% |  | 8.09%
Contract maturities | 1 year |  |  |  | 1 year
Fair value of loans with 90+ day delinquencies | $ 26,177 |  | $ 26,177 |  | $ 38,552
Number of loans in foreclosure | loan | 34 |  | 34 |  | 25
Unpaid principal balance of loans in foreclosure | $ 22,570 |  | $ 22,570 |  | $ 33,066
Business Purpose Bridge Loans | Loans Pledged As Collateral, Short Term Debt |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 126,725 |  |  |  | 92,931
Business Purpose Bridge Loans | Loans Pledged As Collateral, Long Term debt |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Gain (loss) on investments | 373,597 |  |  |  | 544,151
Business Purpose Bridge Loans | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Fair value of loans | $ 26,525 |  | $ 26,525 |  | $ 33,605
Number of loans with 90+ day delinquencies | loan | 35 |  | 35 |  | 31
Fair value of loans with 90+ day delinquencies | $ 30,132 |  | $ 30,132 |  | $ 39,415
Business Purpose Bridge Loans | CAFL |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Number of loans | loan | 1,589 |  |  |  | 0
Unpaid principal balance | $ 272,243 |  | 272,243 |  | $ 0
Fair value of loans | $ 276,354 |  | $ 276,354 |  | $ 0
Weighted average coupon rate | 7.19% |  | 7.19% |  | 0.00%
Contract maturities | 1 year |  |  |  |
Fair value of loans with 90+ day delinquencies | $ 0 |  | $ 0 |  | $ 0
Number of loans in foreclosure | loan | 0 |  | 0 |  | 0
Unpaid principal balance of loans in foreclosure | $ 0 |  | $ 0 |  | $ 0
Business Purpose Bridge Loans | CAFL | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |
Fair value of loans | $ 0 |  | $ 0 |  | $ 0
Number of loans with 90+ day delinquencies | loan | 0 |  | 0 |  | 0
Fair value of loans with 90+ day delinquencies | $ 0 |  | $ 0 |  | $ 0

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

X
- Definition Loans Held For Investment, Number of Loans Transferred + References No definition available. + Details
Name: | rwt_LoansHeldForInvestmentNumberOfLoansTransferred
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
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 cash inflow from repayments of the balance excluding interest (principal) on real estate securities. + References No definition available. + Details
Name: | rwt_ProceedsFromPrincipalRepaymentsOnSecurities
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Real Estate Owned, Held-for-Investment, Adjustable Rate, Percent + References No definition available. + Details
Name: | rwt_RealEstateOwnedHeldForInvestmentAdjustableRatePercent
Namespace Prefix: | rwt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real Estate Owned, Held-for-Investment, Fixed Rate, Percentage + References No definition available. + Details
Name: | rwt_RealEstateOwnedHeldForInvestmentFixedRatePercentage
Namespace Prefix: | rwt_
Data Type: | dtr-types:percentItemType
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=120402547&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=123596393&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=123581744&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=123367319&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=123570139&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 for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
Name: | us-gaap_NotesReceivableNet
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=123570139&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=121570589&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 real estate investments acquired through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 970 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-28(Footnote 4)) -URI http://asc.fasb.org/extlink&oid=120402810&loc=d3e638233-123024 + Details
Name: | us-gaap_RealEstateAcquisitionsThroughForeclosures
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of loans held-for-sale transferred to loans held in the entity's portfolio 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 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: 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=123431023&loc=d3e4332-108586 Reference 3: 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=123431023&loc=d3e4313-108586 + Details
Name: | us-gaap_TransferOfLoansHeldForSaleToPortfolioLoans1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale 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 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: 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=123431023&loc=d3e4332-108586 Reference 3: 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=123431023&loc=d3e4313-108586 + Details
Name: | us-gaap_TransferOfPortfolioLoansAndLeasesToHeldForSale1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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=123431023&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=123431023&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=123431023&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_RelatedPartyTransactionsByRelatedPartyAxis=rwt_CAFLSecuritizationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: | us-gaap_InvestmentTypeAxis=rwt_BusinessPurposeMortgageBankingActivitiesMember
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: | dei_LegalEntityAxis=rwt_CAFLSecuritizationEntitiesMember
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_FinancialInstrumentAxis=rwt_BridgeLoansHeldForInvestmentAtFairValueMember
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: | us-gaap_FinancialInstrumentAxis=rwt_BusinessPurposeResidentialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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