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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, 2018 | Sep. 30, 2018
Credit Reserve |  |
Beginning balance | $ 42,191 | $ 46,549
Amortization of net discount | 0 | 0
Realized credit losses | (616) | (1,957)
Acquisitions | 637 | 5,424
Sales, calls, other | (777) | (1,843)
Impairments | 33 | 89
(Release of) transfers to credit reserves, net | (394) | (7,188)
Ending Balance | 41,074 | 41,074
Unamortized Discount, Net |  |
Beginning balance | 170,090 | 183,753
Amortization of net discount | (3,323) | (11,231)
Realized credit losses | 0 | 0
Acquisitions | 224 | 2,354
Sales, calls, other | (6,586) | (21,265)
Impairments | 0 | 0
(Release of) transfers to credit reserves, net | 394 | 7,188
Ending Balance | $ 160,799 | $ 160,799

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- Definition Balance of credit reserve on available-for-sale securities. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserve
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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_
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
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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 Changes to the credit reserve on available-for-sale securities due to realized credit losses. + References No definition available. + Details
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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
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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Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
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- Definition Balance of net unamortized discount 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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X
- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
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- Details
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Data Type: | na
Balance Type: |
Period Type: |