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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) - Residential - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Credit Reserve |  |
Beginning balance | $ 34,849 | $ 41,370
Amortization of net discount | 0 | 0
Realized credit losses | (694) | (1,874)
Acquisitions | 734 | 2,198
Sales, calls, other | (800) | (7,197)
(Release of) transfers to credit reserves, net | 122 | (286)
Ending Balance | 34,211 | 34,211
Unamortized Discount, Net |  |
Beginning balance | 137,282 | 151,200
Amortization of net discount | (1,834) | (5,823)
Realized credit losses | 0 | 0
Acquisitions | 399 | 1,103
Sales, calls, other | (3,071) | (14,112)
(Release of) transfers to credit reserves, net | (122) | 286
Ending Balance | $ 132,654 | $ 132,654

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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 realized credit losses. + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
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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
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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
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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
Balance Type: | credit
Period Type: | duration

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- Definition Available For Sale Securities Unamortized Discounts Premiums [Abstract] [Roll Forward] + References No definition available. + Details
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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
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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 the amortization of net discount. + References No definition available. + Details
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- Definition Changes to the net unamortized discount on available-for-sale securities due to realized credit losses. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsRealizedCreditGainsLosses
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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- 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_
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- Definition Debt Securities, Available For Sale, Unamortized Discounts Premiums + References No definition available. + Details
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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |