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Derivative Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Derivative [Line Items]
Notional amount	$ 5,197,873,000invest_DerivativeNotionalAmount		$ 3,663,084,000invest_DerivativeNotionalAmount
Net unrealized losses on interest rate agreements accounted for as cash flow hedges	54,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax		46,000,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
Number of counterparties	6rwt_DerivativeNumberOfCounterparties
Cash Flow Hedging | Interest Rate Swaps
Derivative [Line Items]
Notional amount	140,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Valuation adjustments on derivatives	(8,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember	(9,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis = us-gaap_CashFlowHedgingMember
Loan Purchase and Forward Sales Commitments
Derivative [Line Items]
Valuation adjustments on derivatives	18,000,000us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_LoanPurchaseAndForwardSalesCommitmentsMember	(1,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_LoanPurchaseAndForwardSalesCommitmentsMember
Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Valuation adjustments on derivatives	(12,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember
Unsecuritized Residential and Commercial Loans | Interest Rate Contract
Derivative [Line Items]
Notional amount	1,300,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateContractMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember
Unsecuritized Residential and Commercial Loans | Futures
Derivative [Line Items]
Notional amount	72,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember
Unsecuritized Residential and Commercial Loans | TBAs
Derivative [Line Items]
Notional amount	1,900,000,000invest_DerivativeNotionalAmount / us-gaap_DerivativeByNatureAxis = rwt_ToBeAnnouncedContractsMember / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember
Maximum
Derivative [Line Items]
Hedges decreased in value recorded as a component of interest expense	100,000us-gaap_DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum | Interest Rate Swaps
Derivative [Line Items]
Accumulated other comprehensive loss that will be amortized into interest expense	(1,000,000)rwt_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesThatWillBeAmortizedIntoInterestExpense / us-gaap_DerivativeByNatureAxis = us-gaap_InterestRateSwapMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Maximum | Unsecuritized Residential and Commercial Loans
Derivative [Line Items]
Valuation adjustments on derivatives		$ (13,000,000)us-gaap_DerivativeGainLossOnDerivativeNet / us-gaap_DerivativeInstrumentRiskAxis = rwt_ResidentialAndCommercialLoansMember / us-gaap_RangeAxis = us-gaap_MaximumMember

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

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X

- Definition

Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, That Will Be Amortized into Interest Expense

+ References

No definition available.

+ Details

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- Definition

Derivative, Number Of Counterparties

+ References

No definition available.

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- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

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-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a),(c),(d),(e)

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- Definition

The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959

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