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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Credit Reserve |  |
Beginning balance | $ 41,370 |
Ending Balance | 32,940 | $ 41,370
Unamortized Discount, Net |  |
Beginning balance | 151,200 |
Ending Balance | 124,255 | 151,200
Residential |  |
Credit Reserve |  |
Beginning balance | 41,370 | 46,549
Amortization of net discount | 0 | 0
Realized credit losses | (2,606) | (2,165)
Acquisitions | 3,712 | 6,315
Sales, calls, other | (9,453) | (1,850)
Impairments | 0 | 89
Transfers to (release of) credit reserves, net | (83) | (7,568)
Ending Balance | 32,940 | 41,370
Unamortized Discount, Net |  |
Beginning balance | 151,200 | 183,753
Amortization of net discount | (7,921) | (14,098)
Realized credit losses | 0 | 0
Acquisitions | 1,910 | 2,716
Sales, calls, other | (21,017) | (28,739)
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | 83 | 7,568
Ending Balance | $ 124,255 | $ 151,200

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- Definition Changes to the credit reserve on available-for-sale securities due to security acquisitions. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveAcquisitions
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Changes to credit reserve on available-for-sale securities due to the amortization of net discount + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveAmortizationOfNetDiscountPremium
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Changes to the credit reserve on available-for-sale securities due to impairments. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveImpairments
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Changes to the credit reserve on available-for-sale securities due to realized credit losses. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveRealizedCreditGainsLosses
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Available For Sale Securities Credit Reserve [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Changes to the credit reserve on available-for-sale securities due to sales, calls, and other items. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveSalesCallsOther
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveTransfersToReleaseOfCreditReserves
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Available For Sale Securities Unamortized Discounts Premiums [Abstract] [Roll Forward] + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAbstractRollForward
Namespace Prefix: | rwt_
Data Type: | xbrli:stringItemType
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- Definition Changes to the net unamortized discount on available-for-sale securities due to security acquisitions. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAcquisitions
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the net unamortized discount on available-for-sale securities due to the amortization of net discount. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAmortizationOfNetDiscountPremium
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Data Type: | xbrli:monetaryItemType
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X
- Definition Changes to the net unamortized discount on available-for-sale securities due to impairments. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsImpairments
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Changes to the net unamortized discount on available-for-sale securities due to realized credit losses. + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
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- Definition Changes to the net unamortized discount on available-for-sale securities due to sales, calls, and other items. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsSalesCallsOther
Namespace Prefix: | rwt_
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Balance Type: | credit
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- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
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- Definition Debt Securities, Available For Sale, Credit Reserve + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Debt Securities, Available For Sale, Unamortized Discounts Premiums + References No definition available. + Details
Name: | rwt_DebtSecuritiesAvailableForSaleUnamortizedDiscountsPremiums
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |