XML 112 R100.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Commitments and Contingencies - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended | 48 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2010 Plaintiff | Sep. 30, 2018 USD ($) lease | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) loan lease certificate repurchase_request | Sep. 30, 2017 USD ($) | Dec. 31, 2007 certificate | Dec. 31, 2004 certificate | Dec. 31, 2007 certificate | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 23, 2009
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of noncancelable leases | lease |  | 4 |  | 4 |  |  |  |  |  |  |  |
Operating lease expiration dates |  |  |  | 2028 |  |  |  |  |  |  |  |
Future lease commitments with expiration date |  | $ 16,150 |  | $ 16,150 |  |  |  |  |  |  |  |
Operating lease expense |  |  |  | 2,000 | $ 2,000 |  |  |  |  |  |  |
Remaining commitment to fund equity investments |  | 50,000 |  | 50,000 |  |  |  |  |  |  |  |
Participation in loan warehouse facility |  | 39,219 |  | 39,219 |  |  |  |  |  | $ 0 |  |
Loan warehouse facility, additional liability |  | 14,000 |  | 14,000 |  |  |  |  |  |  |  |
Security purchase deposit |  | 57,982 |  | 57,982 |  |  |  |  |  | 0 |  |
Guarantee obligations |  | 17,423 |  | 17,423 |  |  |  |  |  | 19,487 |  |
Guarantee obligations, credit reserve |  | 6,000 |  | 6,000 |  |  |  |  |  |  |  |
Special Purpose Entities (SPEs) assets |  | 47,000 |  | 47,000 |  |  |  |  |  | 48,000 |  |
Special Purpose Entities (SPEs) liabilities |  | 17,000 |  | 17,000 |  |  |  |  |  | 19,000 |  |
Residential repurchase reserve |  | 4,709 |  | $ 4,709 |  |  |  |  |  | 4,916 |  |
Number of residential repurchase requests (in repurchase requests) | repurchase_request |  |  |  | 8 |  |  |  |  |  |  |  |
Number of loans repurchased | loan |  |  |  | 0 |  |  |  |  |  |  |  |
Residential repurchase provisions recorded |  |  |  | $ (200) | (500) |  |  |  |  |  |  |
Aggregate amount of loss contingency reserves |  | 2,000 |  | $ 2,000 |  |  |  |  |  | 2,000 |  |
Morgan Stanley & Co. |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage pass-through certificates issued (in certificates) | certificate |  |  |  | 28 |  |  |  |  |  |  |  |
Sequoia Residential Funding |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of mortgage pass-through certificates issued (in certificates) | certificate |  |  |  |  |  | 2 | 2 | 4 |  |  |  |
Schwab |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of other named defendants along with SRF (in plaintiffs) | Plaintiff | 26 |  |  |  |  |  |  |  |  |  |  |
Residential Loans |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Principal |  | 859,000 |  | $ 859,000 |  |  |  |  |  | $ 1,410,000 |  |
Loans held-for-investment, in foreclosure |  | 1,000 |  | 1,000 |  |  |  |  |  |  |  |
Other income |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other income related to risk sharing agreement |  | 1,000 | $ 1,000 | 3,000 | 2,000 |  |  |  |  |  |  |
Mortgage banking and investment activities |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Market valuation changes in fair value of guarantee asset (less than for three months ending June 30, 2015) |  | (100) | $ (300) | (500) | $ (1,000) |  |  |  |  |  |  |
Guarantee Obligations |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Original unpaid balance of loans subject to risk sharing agreements |  |  |  |  |  |  |  |  |  |  | $ 3,190,000 |
Potential future payments on loans |  | 44,000 |  | 44,000 |  |  |  |  |  |  |  |
Loan Principal |  | $ 1,890,000 |  | $ 1,890,000 |  |  |  |  |  |  |  |
Weighted average original Fair Isaac Corporation (FICO) score |  | 759 |  | 759 |  |  |  |  |  |  |  |
Weighted average original loan-to-value (LTV) |  | 76.00% |  | 76.00% |  |  |  |  |  |  |  |
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Balance of loans 90 days or more delinquent |  | $ 4,000 |  | $ 4,000 |  |  |  |  |  |  |  |
Residential | Sequoia | FHLB Seattle |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Statutory interest rate per annum (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 8.00%
Principal value |  | 133,000 |  | 133,000 |  |  |  |  |  |  |  |
Debt instrument principal payment amount |  |  |  | 126,000 |  |  |  |  |  |  |  |
Debt instrument interest payment amount |  |  |  | 12,000 |  |  |  |  |  |  |  |
Residential | Sequoia | Schwab |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal value |  | 15,000 |  | 15,000 |  |  |  |  |  |  |  |
Principal balance of securities |  | 14,000 |  | 14,000 |  |  |  |  |  |  |  |
Debt instrument interest amount |  | $ 1,000 |  | $ 1,000 |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Security purchase deposit |  |  |  |  |  |  |  |  | $ 180,000 |  |  |

X
- Definition Debt Instrument Accrued Interest + References No definition available. + Details
Name: | rwt_DebtInstrumentAccruedInterest
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument Aggregate Principal Amount + References No definition available. + Details
Name: | rwt_DebtInstrumentAggregatePrincipalAmount
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Debt Instrument Unpaid Interest Paid By Cash + References No definition available. + Details
Name: | rwt_DebtInstrumentUnpaidInterestPaidByCash
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity Method Investment, Commitment To Fund Investment + References No definition available. + Details
Name: | rwt_EquityMethodInvestmentCommitmentToFundInvestment
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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 Fee Income, Risk Sharing Agreement + References No definition available. + Details
Name: | rwt_FeeIncomeRiskSharingAgreement
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 Guarantee Obligation, Credit Reserve + References No definition available. + Details
Name: | rwt_GuaranteeObligationCreditReserve
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The date upon which a lease or a group of leases is set to expire. + References No definition available. + Details
Name: | rwt_LeaseExpirationYear
Namespace Prefix: | rwt_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan Held-for-investment, Amount + References No definition available. + Details
Name: | rwt_LoanHeldforinvestmentAmount
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Long Term Commitment, Additional Liability + References No definition available. + Details
Name: | rwt_LongTermCommitmentAdditionalLiability
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Market Valuation Changes In Fair Value Of Guarantee Asset + References No definition available. + Details
Name: | rwt_MarketValuationChangesInFairValueOfGuaranteeAsset
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Mortgage Loan On Real Estate, Repurchase Reserve + References No definition available. + Details
Name: | rwt_MortgageLoanOnRealEstateRepurchaseReserve
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Mortgage Loans On Real Estate, Number Of Loans Repurchased + References No definition available. + Details
Name: | rwt_MortgageLoansOnRealEstateNumberOfLoansRepurchased
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Mortgage Loans On Real Estate, Repurchase Provision + References No definition available. + Details
Name: | rwt_MortgageLoansOnRealEstateRepurchaseProvision
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Mortgage Loans On Real Estate, Repurchase Requests + References No definition available. + Details
Name: | rwt_MortgageLoansOnRealEstateRepurchaseRequests
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number Of Mortgage Pass Through Certificates Issued + References No definition available. + Details
Name: | rwt_NumberOfMortgagePassThroughCertificatesIssued
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Leases, Number Of Leases, Noncancelable + References No definition available. + Details
Name: | rwt_OperatingLeasesNumberOfLeasesNoncancelable
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage at which the plaintiff would like to collect interest on their initial investment. + References No definition available. + Details
Name: | rwt_PercentageInterestPlaintiff
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Potential Future Payments + References No definition available. + Details
Name: | rwt_PotentialFuturePayments
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement, Original Principal Balance + References No definition available. + Details
Name: | rwt_PrincipalAmountOutstandingonLoansSecuritizedorAssetbackedFinancingArrangementOriginalPrincipalBalance
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Security Transaction Deposit Asset + References No definition available. + Details
Name: | rwt_SecurityTransactionDepositAsset
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Special Purpose Entities, Assets + References No definition available. + Details
Name: | rwt_SpecialPurposeEntitiesAssets
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Special Purpose Entities, Liabilities + References No definition available. + Details
Name: | rwt_SpecialPurposeEntitiesLiabilities
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 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 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11019-110243 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913062&loc=d3e11049-110243 + Details
Name: | us-gaap_GuarantyLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LitigationReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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: | us-gaap_LossContingenciesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of defendants named in a legal action. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfDefendants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
Name: | us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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=109247956&loc=d3e107314-111719 + Details
Name: | us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow to settle a bank borrowing during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfBankDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

X
- Details
Name: | rwt_LossContingenciesByNameOfPlaintiffAxis=rwt_CharlesSchwabCorporationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=us-gaap_OtherIncomeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeStatementLocationAxis=rwt_MortgageBankingAndInvestmentActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_GuaranteeObligationsMember
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_LossContingenciesByNatureOfContingencyAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rwt_SequoiaSecuritizationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | rwt_LossContingenciesByNameOfPlaintiffAxis=srt_FederalHomeLoanBankOfSeattleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |