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Offsetting of Financial Assets, Liabilities, and Collateral (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets $ 15,257us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross [1] $ 7,704us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet 15,257us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral [1] 7,704us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (6,975)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotSubjectToMasterNettingArrangement [1],[2] (6,058)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotSubjectToMasterNettingArrangement [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received (4,735)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash [1],[2] (482)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash [1],[2]
Net Amount 3,547us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed [1] 1,164us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed [1]
Gross Amounts of Recognized Liabilities (1,851,876)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross [1] (930,018)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (1,851,876)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral [1] (930,018)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 1,800,800us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement [1],[2] 918,288us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 50,100us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash [1],[2] 11,730us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash [1],[2]
Net Amount (976)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned [1]    [1]
Interest Rate Swaps    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 7,006us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1] 6,566us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet 7,006us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1] 6,566us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (1,160)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2] (5,402)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received (4,360)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2]  
Net Amount 1,486us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1] 1,164us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1]
Gross Amounts of Recognized Liabilities (48,173)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1] (16,599)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (48,173)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1] (16,599)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 1,160us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2] 5,402us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 47,013us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2] 11,197us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_FinancialInstrumentAxis
= us-gaap_InterestRateSwapMember		 [1],[2]
Net Amount      [1]
Credit Default Index Swaps    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 1,598us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_FinancialInstrumentAxis
= rwt_CreditDefaultIndexSwapsMember		 [1]  
Net Amounts of Assets Presented in Consolidated Balance Sheet 1,598us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= rwt_CreditDefaultIndexSwapsMember		 [1]  
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received (375)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
/ us-gaap_FinancialInstrumentAxis
= rwt_CreditDefaultIndexSwapsMember		 [1],[2]  
Net Amount 1,223us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_FinancialInstrumentAxis
= rwt_CreditDefaultIndexSwapsMember		 [1]  
TBAs    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Assets 6,653us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1] 1,138us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedGross
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Assets Presented in Consolidated Balance Sheet 6,653us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1] 1,138us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments (5,815)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2] (656)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Received   (482)us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowedCollateralObligationToReturnCash
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2]
Net Amount 838us-gaap_DerivativeAssetSecuritiesPurchasedUnderAgreementsToResellSecuritiesBorrowed
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1]  
Gross Amounts of Recognized Liabilities (9,506)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1] (661)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (9,506)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1] (661)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 5,815us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2] 656us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 2,715us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2] 5us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1],[2]
Net Amount (976)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoaned
/ us-gaap_FinancialInstrumentAxis
= rwt_ToBeAnnouncedContractsMember		 [1]    [1]
Futures    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (372)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FutureMember		 [1] (528)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FutureMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (372)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FutureMember		 [1] (528)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FutureMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Cash Collateral Pledged 372us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FutureMember		 [1],[2] 528us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedCollateralRightToReclaimCash
/ us-gaap_FinancialInstrumentAxis
= us-gaap_FutureMember		 [1],[2]
Net Amount      [1]
Loan warehouse debt    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (1,185,316)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarehouseAgreementBorrowingsMember		 [1] (184,789)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarehouseAgreementBorrowingsMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (1,185,316)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarehouseAgreementBorrowingsMember		 [1] (184,789)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarehouseAgreementBorrowingsMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 1,185,316us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarehouseAgreementBorrowingsMember		 [1],[2] 184,789us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_WarehouseAgreementBorrowingsMember		 [1],[2]
Net Amount      [1]
Security repurchase agreements    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities (608,509)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_RepurchaseAgreementsMember		 [1] (677,974)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_RepurchaseAgreementsMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet (608,509)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_RepurchaseAgreementsMember		 [1] (677,974)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_RepurchaseAgreementsMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments 608,509us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_RepurchaseAgreementsMember		 [1],[2] 677,974us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_RepurchaseAgreementsMember		 [1],[2]
Net Amount      [1]
Commercial borrowings    
Offsetting Asset and Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities   (49,467)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedGross
/ us-gaap_FinancialInstrumentAxis
= us-gaap_BorrowingsMember		 [1]
Gross Amounts Offset in Consolidated Balance Sheet      [1]
Net Amounts of Liabilities Presented in Consolidated Balance Sheet   (49,467)us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedAmountOffsetAgainstCollateral
/ us-gaap_FinancialInstrumentAxis
= us-gaap_BorrowingsMember		 [1]
Gross Amounts Not Offset in Consolidated Balance Sheet, Financial Instruments   49,467us-gaap_DerivativeLiabilitySecuritiesSoldUnderAgreementsToResellSecuritiesLoanedNotSubjectToMasterNettingArrangement
/ us-gaap_FinancialInstrumentAxis
= us-gaap_BorrowingsMember		 [1],[2]
Net Amount      [1]
[1] Interest rate agreements, TBAs, and futures are components of derivative instruments on our consolidated balances sheets. Loan warehouse debt, which is secured by residential and commercial mortgage loans, and security repurchase agreements are components of short-term debt on our consolidated balance sheets.
[2] Amounts presented in these columns are limited in total to the net amount of assets or liabilities presented in the prior column by instrument. In certain cases, there is excess cash collateral or financial assets we have pledged to a counterparty (which may, in certain circumstances, be a clearinghouse) that exceed the financial liabilities subject to a master netting arrangement or similar agreement. Additionally, in certain cases, counterparties may have pledged excess cash collateral to us that exceeds our corresponding financial assets. In each case, any of these excess amounts are excluded from the table although they are separately reported in our consolidated balance sheets as assets or liabilities, respectively.