XML 27 R55.htm IDEA: XBRL DOCUMENT v2.4.1.9

Principles of Consolidation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	4rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember	12rwt_NumberOfSecuritizationEntitiesToWhichAssetTransferred / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Sequoia
Variable Interest Entity [Line Items]
Deconsolidated residential loans and other assets			$ 961rwt_DeconsolidatedResidentialLoansAndOtherAssets / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Deconsolidated residential loans and other assets, allowances for loan losses			27rwt_DeconsolidatedAllowanceForLoanLosses / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Deconsolidated asset based securities issued and other liabilities			970rwt_DeconsolidatedAssetBasedSecuritiesIssuedAndOtherLiabilities / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember
Realized gain from deconsolidation			$ 21us-gaap_DeconsolidationGainOrLossAmount / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = rwt_SequoiaSecuritizationEntitiesMember

X

- 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

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

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

X

- Details

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

X

- Details

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