XML 133 R117.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investment Fair Value Changes, Net - Components of Investment Activities (Details) - Investment Fair Value Changes, Net - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | $ 10,374 | $ (28,574) | $ (21,357)
Residential loans held-for-investment, at Redwood |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | (5,765) | (23,102) | (6,337)
Trading securities |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | 39,526 | 9,666 | (2,019)
Net investments in Legacy Sequoia entities |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | (8,027) | (4,200) | (1,192)
Net investments in Sequoia Choice entities |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | (323) | 0 | 0
Risk-sharing investments |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | (1,484) | (1,151) | (1,886)
Risk management derivatives, net |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | (12,842) | (9,112) | (9,677)
Commercial Loans |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | 300 | (307) | 0
Impairments on AFS securities |  |  |
Investment Holdings [Line Items] |  |  |
Investment Fair Value Changes, Net | $ (1,011) | $ (368) | $ (246)

X
- Definition Increase (Decrease) in Fair Value Adjustments on Assets + References No definition available. + Details
Name: | rwt_IncreaseDecreaseinFairValueAdjustmentsonAssets
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_InvestmentHoldingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rwt_InvestmentActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_ResidentialLoansHeldForInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_TradingAccountAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_LegacySequoiaSecuritizationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_SequoiaChoiceSecuritizationEntitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_RiskSharingInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_PriceRiskDerivativeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CommercialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rwt_ImpairedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |