2.4.0.81049 - Disclosure - Securitization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$eol_PE798-----1310-Q0007_STD_91_20130630_0http://www.sec.gov/CIK0000930236duration2013-04-01T00:00:002013-06-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$eol_PE798-----1310-Q0007_STD_181_20130630_0http://www.sec.gov/CIK0000930236duration2013-01-01T00:00:002013-06-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDtruefalse$eol_PE798-----1310-Q0007_STD_91_20130630_0_707066x808172_708088x710699http://www.sec.gov/CIK0000930236duration2013-04-01T00:00:002013-06-30T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-1invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveOneMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDtruefalse$eol_PE798-----1310-Q0007_STD_91_20120630_0_707066x808172_708088x710699http://www.sec.gov/CIK0000930236duration2012-04-01T00:00:002012-06-30T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-1invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveOneMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20130630_0_707066x808172_708088x710699_710256x708138http://www.sec.gov/CIK0000930236instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-1invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveOneMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseTrading Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_TradingAccountAssetsMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20120630_0_707066x808172_708088x710699_710256x708138http://www.sec.gov/CIK0000930236instant2012-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-1invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveOneMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseTrading Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_TradingAccountAssetsMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20130630_0_707066x808172_708088x710699_710256x712076http://www.sec.gov/CIK0000930236instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-1invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveOneMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseAvailable-for-sale Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AvailableforsaleSecuritiesMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$8false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20120630_0_707066x808172_708088x710699_710256x712076http://www.sec.gov/CIK0000930236instant2012-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-1invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveOneMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseAvailable-for-sale Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AvailableforsaleSecuritiesMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$9false USDtruefalse$eol_PE798-----1310-Q0007_STD_181_20130630_0_707066x814480_708088x710699http://www.sec.gov/CIK0000930236duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-2invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveTwoMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10false USDtruefalse$eol_PE798-----1310-Q0007_STD_182_20120630_0_707066x814480_708088x710699http://www.sec.gov/CIK0000930236duration2012-01-01T00:00:002012-06-30T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-2invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveTwoMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20130630_0_707066x814480_708088x710699_710256x708138http://www.sec.gov/CIK0000930236instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-2invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveTwoMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseTrading Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_TradingAccountAssetsMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$12false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20120630_0_707066x814480_708088x710699_710256x708138http://www.sec.gov/CIK0000930236instant2012-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-2invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveTwoMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseTrading Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_TradingAccountAssetsMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$13false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20130630_0_707066x814480_708088x710699_710256x712076http://www.sec.gov/CIK0000930236instant2013-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-2invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveTwoMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseAvailable-for-sale Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AvailableforsaleSecuritiesMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$14false USDtruefalse$eol_PE798-----1310-Q0007_STD_0_20120630_0_707066x814480_708088x710699_710256x712076http://www.sec.gov/CIK0000930236instant2012-06-30T00:00:000001-01-01T00:00:00falsefalseVariable Interest Entity, Not Primary Beneficiaryus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_VariableInterestEntityNotPrimaryBeneficiaryMemberus-gaap_VariableInterestEntitiesByClassificationOfEntityAxisexplicitMemberfalsefalseSEMT 2012-2invest_InvestmentSecuritiesClassAxisxbrldihttp://xbrl.org/2006/xbrldirwt_SemtTwentyTwelveTwoMemberinvest_InvestmentSecuritiesClassAxisexplicitMemberfalsefalseAvailable-for-sale Securitiesus-gaap_InvestmentTypeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_AvailableforsaleSecuritiesMemberus-gaap_InvestmentTypeAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 3us-gaap_VariableInterestEntityLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10falsefalsefalse00falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Variable Interest Entity [Line Items]2false 4us-gaap_PrincipalAmountOutstandingOnLoansSecuritizedus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse18020580001802058USD$falsetruefalse4truefalsefalse293590000293590USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9truefalsefalse40427100004042710USD$falsetruefalse10truefalsefalse10368560001036856USD$falsetruefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThis is the principal amount outstanding for securitized loans only (across all types of loans).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719 false2Principal balance of loans transferred3false 4us-gaap_TransfersOfFinancialAssetsAccountedForAsSaleInitialFairValueOfAssetsObtainedAsProceedsus-gaap_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:monetaryItemTypemonetaryRepresents the initial fair value recorded for assets received on transfer of financial assets in a securitization, asset-backed financing arrangement, or a similar transfer which transaction is recognized as a sale of the transferred financial assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107207-111719 false2Securities retained, at fair value4false 4us-gaap_GainLossOnSecuritizationOfFinancialAssetsus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4truefalsefalse42430004243falsefalsefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9falsefalsefalse00falsefalsefalse10truefalsefalse1160900011609falsefalsefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryA gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7,9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 false2Gains on sale5false 4us-gaap_ServicingAssetAtFairValueAdditionsus-gaap_truedebitdurationfalsefalsefalsefalsefalsefalsefalsefalsepositiveLabel1truefalsefalse1600000016000USD$falsetruefalse2truefalsefalse2900000029000USD$falsetruefalse3truefalsefalse1614800016148USD$falsetruefalse4truefalsefalse10290001029USD$falsetruefalse5falsefalsefalse00falsefalsefalse6falsefalsefalse00falsefalsefalse7falsefalsefalse00falsefalsefalse8falsefalsefalse00falsefalsefalse9truefalsefalse2861400028614USD$falsetruefalse10truefalsefalse26080002608USD$falsetruefalse11falsefalsefalse00falsefalsefalse12falsefalsefalse00falsefalsefalse13falsefalsefalse00falsefalsefalse14falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 false2MSRs recognizedfalseSecuritization Activity Related to Unconsolidated Variable Interest Entity's Sponsored by Redwood (Detail) (USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.redwoodtrust.com/taxonomy/role/DisclosureSecuritizationActivityRelatedToUnconsolidatedVariableInterestEntitysSponsoredByRedwood145