XML 24 R79.htm IDEA: XBRL DOCUMENT v2.4.1.9

Real Estate Securities - Trading Securities by Collateral Type (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Trading securities	$ 106,837us-gaap_TradingSecurities	$ 111,606us-gaap_TradingSecurities
Senior Securities
Investment Holdings [Line Items]
Trading securities	73,263us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember	101,753us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Senior Securities | Prime
Investment Holdings [Line Items]
Trading securities	65,809us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember	93,802us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Senior Securities | Non-prime
Investment Holdings [Line Items]
Trading securities	7,454us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember	7,951us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Subordinate Securities | Prime
Investment Holdings [Line Items]
Trading securities	$ 33,574us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember	$ 9,853us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember

X

- Details

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

X

- Definition

Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.

+ References

Reference 1: 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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rwt_SeniorSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rwt_SubordinateSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: