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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
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Dec. 31, 2020 | Dec. 31, 2019
Credit Reserve |  |
Beginning balance | $ 32,940 |
Ending Balance | 44,967 | $ 32,940
Unamortized Discount, Net |  |
Beginning balance | 124,255 |
Ending Balance | 95,718 | 124,255
Residential |  |
Credit Reserve |  |
Beginning balance | 32,940 | 41,370
Amortization of net discount | 0 | 0
Realized credit losses | (2,282) | (2,606)
Acquisitions | 7,248 | 3,712
Sales, calls, other | (731) | (9,453)
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | 7,792 | (83)
Ending Balance | 44,967 | 32,940
Unamortized Discount, Net |  |
Beginning balance | 124,255 | 151,200
Amortization of net discount | (6,538) | (7,921)
Realized credit losses | 0 | 0
Acquisitions | 2,634 | 1,910
Sales, calls, other | (16,841) | (21,017)
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | (7,792) | 83
Ending Balance | $ 95,718 | $ 124,255

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- Definition Changes to the credit reserve on available-for-sale securities due to impairments. + 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 Credit Reserve [Roll Forward] + References No definition available. + Details
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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
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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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- 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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- 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 impairments. + 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
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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
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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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- Definition Changes to the credit reserve on available-for-sale securities due to security acquisitions. + References No definition available. + Details
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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
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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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- Details
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Data Type: | na
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Period Type: |