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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 | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015
Credit Reserve |  |
Beginning balance | $ 61,700 | $ 70,067
Amortization of net discount | 0 | 0
Realized credit losses | (1,706) | (7,420)
Acquisitions | 0 | 858
Sales, calls, other | (1,632) | (1,632)
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | (3,021) | (6,532)
Ending Balance | 55,341 | 55,341
Unamortized Discount Net |  |
Beginning balance | 273,119 | 296,342
Amortization of net discount | (9,115) | (28,277)
Realized credit losses | 0 | 0
Acquisitions | 0 | 5,705
Sales, calls, other | (5,522) | (18,799)
Impairments | 226 | 226
Transfers to (release of) credit reserves, net | 3,021 | 6,532
Ending Balance | $ 261,729 | $ 261,729

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- Definition Balance of credit reserve on available-for-sale securities. + References No definition available. + Details
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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
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 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: |