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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, 2017 | Sep. 30, 2017
Credit Reserve |  |
Beginning balance | $ 47,588 | $ 47,473
Amortization of net discount | 0 | 0
Realized credit losses | (795) | (3,232)
Acquisitions | 1,665 | 8,256
Sales, calls, other | (144) | (3,405)
Impairments | 3 | 248
Transfers to (release of) credit reserves, net | (1,442) | (2,465)
Ending Balance | 46,875 | 46,875
Unamortized Discount, Net |  |
Beginning balance | 192,063 | 198,112
Amortization of net discount | (4,631) | (14,697)
Realized credit losses | 0 | 0
Acquisitions | 2,732 | 11,375
Sales, calls, other | (2,214) | (7,863)
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | 1,442 | 2,465
Ending Balance | $ 189,392 | $ 189,392

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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
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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
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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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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
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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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Balance Type: |
Period Type: |