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Real Estate Securities - Schedule of Changes in 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, 2023 | Dec. 31, 2022
Credit Reserve |  |
Beginning balance | $ 28,739 |
Ending Balance | 23,436 | $ 28,739
Unamortized Discount, Net |  |
Beginning balance | 61,650 |
Ending Balance | 46,885 | 61,650
Residential |  |
Credit Reserve |  |
Beginning balance | 28,739 | 27,555
Amortization of net discount | 0 | 0
Realized credit recoveries (losses), net | 158 | 471
Acquisitions | 1,106 | 0
Sales, calls, other | (5,331) | (842)
Transfers to (release of) credit reserves, net | (1,236) | 1,555
Ending Balance | 23,436 | 28,739
Unamortized Discount, Net |  |
Beginning balance | 61,650 | 76,023
Amortization of net discount | (1,170) | (11,153)
Realized credit recoveries (losses), net | 0 | 0
Acquisitions | 754 | 0
Sales, calls, other | (15,585) | (1,665)
Transfers to (release of) credit reserves, net | 1,236 | (1,555)
Ending Balance | $ 46,885 | $ 61,650

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- Definition Available For Sale Securities Credit Reserve [Roll Forward] + References No definition available. + Details
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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
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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
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Balance Type: | credit
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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 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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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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- Definition Debt Securities, Available For Sale, Unamortized Discounts Premiums + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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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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Namespace Prefix: | rwt_
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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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