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Trading Securities by Collateral Type (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Investment Holdings [Line Items] |  |
Trading securities | $ 111,606 us-gaap_TradingSecurities | $ 124,555 us-gaap_TradingSecurities
Senior Securities |  |
Investment Holdings [Line Items] |  |
Trading securities | 101,753 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 119,575 us-gaap_TradingSecurities / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Senior Securities | Prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 93,802 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 110,505 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Senior Securities | Non-prime |  |
Investment Holdings [Line Items] |  |
Trading securities | 7,951 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember | 9,070 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialSubprimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SeniorSecuritiesMember
Subordinate Securities | Prime |  |
Investment Holdings [Line Items] |  |
Trading securities | $ 9,853 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember | $ 4,980 us-gaap_TradingSecurities / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialPrimeFinancingReceivableMember / us-gaap_InvestmentTypeAxis = rwt_SubordinateSecuritiesMember

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- 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
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