XML 136 R120.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Taxes - Additional Information (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($)
Income Taxes [Line Items] |
Tax act, tax benefit due to net deferred tax liabilities | $ 8,000,000
Percentage prohibited transaction tax for not meeting the requirements of statutory relief | 100.00%
Federal |
Income Taxes [Line Items] |
Estimated operating loss carry forwards | $ (57,000,000)
NOL carry forwards, expiring year | 2029
NOL carry forwards | $ 0
State and Local Jurisdiction |
Income Taxes [Line Items] |
NOL carry forwards | $ 1,260,000,000

X
- Definition Estimated Operating Loss Carryforwards + References No definition available. + Details
Name: | rwt_EstimatedOperatingLossCarryforwards
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Income Taxes [Line Items] + References No definition available. + Details
Name: | rwt_IncomeTaxesLineItems
Namespace Prefix: | rwt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Operating Loss Carryforwards, Expiration Year + References No definition available. + Details
Name: | rwt_OperatingLossCarryforwardsExpirationYear
Namespace Prefix: | rwt_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Prohibited Transaction Tax Rate + References No definition available. + Details
Name: | rwt_ProhibitedTransactionTaxRate
Namespace Prefix: | rwt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of income tax (expense) benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
Name: | rwt_TaxCutsAndJobsActOf2017ChangeInTaxRateDeferredTaxLiabilityIncomeTaxExpenseBenefit
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |