XML 87 R72.htm IDEA: XBRL DOCUMENT v3.3.1.900

Fair Value of Financial Instruments - Quantitative Information about Significant Unobservable Inputs Used in Valuation of Level 3 Assets and Liabilities Measured at Fair Value (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) $ / loan
Residential Loans at Lower of Cost or Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,096,000
Residential Loans at Lower of Cost or Fair Value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity, percent	13.00%
Residential Loans at Lower of Cost or Fair Value | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity, percent	30.00%
Residential Loans at Lower of Cost or Fair Value | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity, percent	21.00%
Loan Purchase Commitments
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 3,208,000
Loan Purchase Commitments | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA price (usd per loan) | $ / loan	3.10
Prepayment rate, percent	15.00%
MSR Multiple	0
Fallout rate, percent	1.00%
Loan Purchase Commitments | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA price (usd per loan) | $ / loan	4.38
Prepayment rate, percent	15.00%
MSR Multiple	6
Fallout rate, percent	99.00%
Loan Purchase Commitments | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA price (usd per loan) | $ / loan	4.16
Prepayment rate, percent	15.00%
MSR Multiple	3.4
Fallout rate, percent	25.00%
REO
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 2,395,000
REO | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity, percent	0.00%
REO | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity, percent	89.00%
REO | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loss severity, percent	51.00%
Guarantee Asset
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 5,697,000
Guarantee Asset | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	12.00%
Discount rate, percent	11.00%
Guarantee Asset | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	12.00%
Discount rate, percent	11.00%
Guarantee Asset | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	12.00%
Discount rate, percent	11.00%
Mortgage Servicing Rights
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 191,976,000
Mortgage Servicing Rights | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	5.00%
Discount rate, percent	9.00%
Per loan annual cost to service (usd per loan)	$ 72
Mortgage Servicing Rights | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	60.00%
Discount rate, percent	12.00%
Per loan annual cost to service (usd per loan)	$ 82
Mortgage Servicing Rights | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	10.00%
Discount rate, percent	10.00%
Per loan annual cost to service (usd per loan)	$ 79
Investment Securities [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,233,256,000
Investment Securities [Member] | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	1.00%
Loss severity, percent	20.00%
Credit support, percent	0.00%
Discount rate, percent	5.00%
Default rate, percent	0.00%
Investment Securities [Member] | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	35.00%
Loss severity, percent	65.00%
Credit support, percent	48.00%
Discount rate, percent	12.00%
Default rate, percent	35.00%
Investment Securities [Member] | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	12.00%
Loss severity, percent	29.00%
Credit support, percent	4.00%
Discount rate, percent	6.00%
Default rate, percent	6.00%
Commercial Loans at Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 106,798,000
Commercial Loans at Fair Value | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	2.21%
Credit support, percent	26.00%
Commercial Loans at Fair Value | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	2.21%
Credit support, percent	26.00%
Commercial Loans at Fair Value | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	2.21%
Credit support, percent	26.00%
Residential Loans Priced To Whole Loan Market and Committed to Sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 633,310,000
Residential Loans Priced To Whole Loan Market and Committed to Sell [Member] | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Committed Sales Price (usd per loan) | $ / loan	102.56
Residential Loans Priced To Whole Loan Market and Committed to Sell [Member] | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Committed Sales Price (usd per loan) | $ / loan	102.61
Residential Loans Priced To Whole Loan Market and Committed to Sell [Member] | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Committed Sales Price (usd per loan) | $ / loan	102.58
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,936,062,000
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell [Member] | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA price (usd per loan) | $ / loan	3.10
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell [Member] | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA price (usd per loan) | $ / loan	4.53
Residential Loans Priced To Securitization and Whole Loan Market, Uncommitted to Sell [Member] | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Whole loan spread to TBA price (usd per loan) | $ / loan	4.27
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 206,309,000
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	15.00%
Spread to swap rate, percent	1.25%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	15.00%
Spread to swap rate, percent	1.65%
Residential Jumbo Hybrid Loans Priced To Whole Loan Market Uncommitted To Sell | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	15.00%
Spread to swap rate, percent	1.38%
Residential Loans Held For Investment at Fair Value
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 1,021,870,000
Loan Purchase Commitments | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	1.25%
Loan Purchase Commitments | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	1.65%
Loan Purchase Commitments | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	1.37%
Asset-backed Securities
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 996,820,000
Asset-backed Securities | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	2.00%
Loss severity, percent	20.00%
Credit support, percent	0.00%
Discount rate, percent	5.00%
Default rate, percent	1.00%
Asset-backed Securities | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	23.00%
Loss severity, percent	32.00%
Credit support, percent	33.00%
Discount rate, percent	9.00%
Default rate, percent	12.00%
Asset-backed Securities | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Prepayment rate, percent	12.00%
Loss severity, percent	27.00%
Credit support, percent	9.00%
Discount rate, percent	5.00%
Default rate, percent	7.00%
Commercial Secured Borrowings
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value	$ 63,152,000
Commercial Secured Borrowings | Minimum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	2.19%
Credit support, percent	25.00%
Commercial Secured Borrowings | Maximum
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	2.20%
Credit support, percent	25.00%
Commercial Secured Borrowings | Weighted Average
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Spread to swap rate, percent	2.20%
Credit support, percent	25.00%

X

- Definition

Fair Value Inputs, Committed Sales Price

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsCommittedSalesPrice
Namespace Prefix:	rwt_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Inputs, Credit Spreads

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsCreditSpreads
Namespace Prefix:	rwt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of credit support for financial asset.

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsCreditSupport
Namespace Prefix:	rwt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Inputs, Fallout Rate

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsFalloutRate
Namespace Prefix:	rwt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Inputs, Mortgage Servicing Right (MSR) Multiple

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsMortgageServicingRightMSRMultiple
Namespace Prefix:	rwt_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair Value Inputs, Per Loan Annual Cost To Service

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsPerLoanAnnualCostToService
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Fair Value Inputs, Whole Loan Spread

+ References

No definition available.

+ Details

Name:	rwt_FairValueInputsWholeLoanSpread
Namespace Prefix:	rwt_
Data Type:	us-types:perUnitItemType
Balance Type:	na
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:	us-gaap_FairValueInputsAssetsQuantitativeInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsDiscountRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Loss, including interest and principal, incurred on a defaulted security, expressed as a percentage of the original principal balance, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsLossSeverity
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rate at which loans or a loan portfolio are expected to prepay principal balances, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsPrepaymentRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueInputsProbabilityOfDefault
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258

+ Details

Name:	us-gaap_FairValueNetDerivativeAssetLiabilityMeasuredOnRecurringBasisWithUnobservableInputs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_WeightedAverageMember
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=rwt_OtherRealEstateOwnedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_GuaranteeAssetMember
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_InvestmentSecuritiesMember
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_ResidentialLoansPricedToWholeLoanMarketandCommittedtoSellMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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