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Mortgage Servicing Rights - Components of Mortgage Servicing Rights Income (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Servicing income: |  |
Income | $ 9,716 us-gaap_ContractuallySpecifiedServicingFeesAmount | $ 3,633 us-gaap_ContractuallySpecifiedServicingFeesAmount
Cost of sub-servicer | (1,229)rwt_MortgageServicingExpense | (316)rwt_MortgageServicingExpense
Net servicing income | 8,487 us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets | 3,317 us-gaap_ContractuallySpecifiedServicingFeesLateFeesAndAncillaryFeesEarnedInExchangeForServicingFinancialAssets
Market valuation adjustments | (19,517)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights | (2,711)rwt_TotalNetChangeInMarketValueRelatedToMortgageServicingRights
MSR provision for repurchases | 106 rwt_ProvisionForMortgageServicingRightsRepurchases | 0 rwt_ProvisionForMortgageServicingRightsRepurchases
MSR income (loss) | $ (10,924)rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs | $ 606 rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs

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- Definition Mortgage Servicing Expense + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Includes income from mortgage banking servicing real estate mortgages, net of subservicing costs, and market valuation changes of MSRs held at fair value. + References No definition available. + Details
Name: | rwt_MortgageServicingRightsIncomeIncludingMarketValuationChangesOfMSRs
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Provision for mortgage servicing rights repurchases. + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Total net change in market value related to mortgage servicing rights. + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The total amount of contractually specified servicing fees, late fees, and ancillary fees earned for each period for which results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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