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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Long-term debt at fair value	$ 66,707us-gaap_LongTermDebtFairValue	$ 66,146us-gaap_LongTermDebtFairValue
Common stock, par value	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare	$ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized	180,000,000us-gaap_CommonStockSharesAuthorized	180,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued	83,443,141us-gaap_CommonStockSharesIssued	82,504,801us-gaap_CommonStockSharesIssued
Common stock, outstanding	83,443,141us-gaap_CommonStockSharesOutstanding	82,504,801us-gaap_CommonStockSharesOutstanding
Variable interest held by entity, assets	1,900,208us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets	2,299,576us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Variable interest held by entity, liabilities	1,546,490us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities	1,944,911us-gaap_VariableInterestEntityConsolidatedCarryingAmountLiabilities
Commercial Loans Held For Investment
Loans at fair value	$ 71,262us-gaap_ReceivablesFairValueDisclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember	$ 0us-gaap_ReceivablesFairValueDisclosure / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = rwt_CommercialLoansHeldForInvestmentMember

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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