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Available for Sale Securities by Collateral Type (Detail) (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2014

Dec. 31, 2013

Investment Holdings [Line Items]

Available-for-sale securities

$ 1,267,624us-gaap_AvailableForSaleSecurities

$ 1,558,306us-gaap_AvailableForSaleSecurities

Senior Securities

Investment Holdings [Line Items]

Available-for-sale securities

487,557us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember

855,692us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember

Senior Securities | Prime

Investment Holdings [Line Items]

Available-for-sale securities

307,813us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember

662,306us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialPrimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember

Senior Securities | Non-prime

Investment Holdings [Line Items]

Available-for-sale securities

179,744us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember

193,386us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SeniorSecuritiesMember

Re-REMIC

Investment Holdings [Line Items]

Available-for-sale securities

168,347us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember

176,376us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_ResecuritizationOfRealEstateMortgageInvestmentSecuritiesMember

Subordinate Securities

Investment Holdings [Line Items]

Available-for-sale securities

611,720us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember

526,238us-gaap_AvailableForSaleSecurities
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember

Subordinate Securities | Non-prime | Maximum

Investment Holdings [Line Items]

Available-for-sale securities

1,000us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember

1,000us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_ResidentialSubprimeFinancingReceivableMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember

Subordinate Securities | Prime Mezzanine

Investment Holdings [Line Items]

Available-for-sale securities

448,838us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= rwt_PrimeMezzanineMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember

^[1]

384,849us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= rwt_PrimeMezzanineMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember

^[1]

Subordinate Securities | Subordinate

Investment Holdings [Line Items]

Available-for-sale securities

$ 162,882us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= rwt_SubordinateMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember

^[2]

$ 141,389us-gaap_AvailableForSaleSecurities
/ invest_InvestmentSecuritiesClassAxis
= rwt_SubordinateMember
/ us-gaap_InvestmentTypeAxis
= rwt_SubordinateSecuritiesMember

^[2]

[1]	Mezzanine includes securities initially rated AA, A, and BBB- and issued in 2012 or later.
[2]	Subordinate securities includes less than $1 million of non-prime securities at both December 31, 2014 and 2013.

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

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