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Principles of Consolidation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 Entity | Dec. 31, 2013 Entity | Dec. 31, 2012
Variable Interest Entity, Not Primary Beneficiary |  |  |
Variable Interest Entity [Line Items] |  |  |
Number of securitization entities to which asset transferred | 4 rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember | 12 rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember |
Sequoia |  |  |
Variable Interest Entity [Line Items] |  |  |
Deconsolidated residential loans and other assets |  |  | $ 961 rwt_DeconsolidatedResidentialLoansAndOtherAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Deconsolidated residential loans and other assets, allowances for loan losses |  |  | 27 rwt_DeconsolidatedAllowanceForLoanLosses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Deconsolidated asset based securities issued and other liabilities |  |  | 970 rwt_DeconsolidatedAssetBasedSecuritiesIssuedAndOtherLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Realized gain from deconsolidation |  |  | $ 21 us-gaap_DeconsolidationGainOrLossAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember

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- Definition The amount of allowance for loan losses derecognized by the parent in the period due to deconsolidation of a subsidiary. + References No definition available. + Details
Name: | rwt_DeconsolidatedAllowanceForLoanLosses
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Deconsolidated Asset Based Securities Issued and Other Liabilities + References No definition available. + Details
Name: | rwt_DeconsolidatedAssetBasedSecuritiesIssuedAndOtherLiabilities
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of assets derecognized by the parent in the period due to deconsolidation of a subsidiary. + References No definition available. + Details
Name: | rwt_DeconsolidatedResidentialLoansAndOtherAssets
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of Securitization Entities to which Asset Transferred + References No definition available. + Details
Name: | rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred
Namespace Prefix: | rwt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4582445-111684 + Details
Name: | us-gaap_DeconsolidationGainOrLossAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=rwt_SequoiaSecuritizationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |