XML 108 R64.htm IDEA: XBRL DOCUMENT v2.4.1.9

Fair Value of Financial Instruments - Portion of Net Gains (Losses) Attributable to Level 3 Assets and Liabilities Still Held Included in Net Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Loan Purchase Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 liabilities still held included in net income	$ 0rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember	$ (235)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = us-gaap_LoanPurchaseCommitmentsMember
Commercial Secured Borrowings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 liabilities still held included in net income	(1,509)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = rwt_CommercialSecuredLoanMember
Asset-backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 liabilities still held included in net income	(2,946)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByLiabilityClassAxis = us-gaap_AssetBackedSecuritiesMember
Residential Loans Held For Investment at Fair Value | Residential loans at Redwood
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	5,464rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansHeldAtRedwoodMember	3,483rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansHeldAtRedwoodMember
Residential Loans Held For Investment at Fair Value | Residential loans at consolidated Sequoia entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	1,179rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansAtConsolidatedSequoiaEntitiesMember	0rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_ResidentialLoansHeldForInvestmentAtFairValueMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = rwt_ResidentialLoansAtConsolidatedSequoiaEntitiesMember
Guarantee Asset
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(1,083)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember	0rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_AssetValueGuaranteesMember
Commercial Loans at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	2,959rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_CommercialLoansAtFairValueMember	2,530rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_CommercialLoansAtFairValueMember
Trading Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(13,790)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember	(4,431)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_TradingAccountAssetsMember
Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	0rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember	(113)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_AvailableforsaleSecuritiesMember
Mortgage Servicing Rights
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	(11,769)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember	(2,291)rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = rwt_MortgageServicingRightsMember
Loan Purchase Commitments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Net gains (losses) attributable to level 3 assets still held included in net income	$ 7,422rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember	$ 0rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown / us-gaap_FairValueByAssetClassAxis = us-gaap_LoanPurchaseCommitmentsMember

X

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down

+ References

No definition available.

+ Details

Name:	rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included In Earnings, Excluding Sold, Matured, Called, Or Written Down

+ References

No definition available.

+ Details

Name:	rwt_FairValueMeasurementwithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarningsExcludingSoldMaturedCalledOrWrittenDown
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_AssetValueGuaranteesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_CommercialLoansAtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_MortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_ResidentialLoansHeldForInvestmentAtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_AvailableforsaleSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_LoanPurchaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_TradingAccountAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=rwt_CommercialSecuredLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_LoanPurchaseCommitmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: