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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) - Residential - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Credit Reserve |  |
Beginning balance | $ 70,067 | $ 116,870
Amortization of net discount | 0 | 0
Realized credit losses | (8,535) | (11,501)
Acquisitions | 2,557 | 3,581
Sales, calls, other | (7,296) | (2,555)
Impairments | 0 | 565
Transfers to (release of) credit reserves, net | (7,924) | (36,893)
Ending Balance | 48,869 | 70,067
Unamortized Discount Net |  |
Beginning balance | 296,342 | 298,469
Amortization of net discount | (36,850) | (42,835)
Realized credit losses | 0 | 0
Acquisitions | 15,791 | 15,348
Sales, calls, other | (46,346) | (11,533)
Impairments | 246 | 0
Transfers to (release of) credit reserves, net | 7,924 | 36,893
Ending Balance | $ 237,107 | $ 296,342

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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 Available For Sale Securities Credit Reserve [Abstract] + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveAbstract
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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 security acquisitions. + References No definition available. + Details
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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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- 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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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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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] + 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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- Details
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Period Type: |