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Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) - Jun. 30, 2015 - Residential - USD ($) $ in Thousands | Total | Total
--- | --- | ---
Credit Reserve |  |
Beginning balance | $ 63,584 | $ 70,067
Amortization of net discount | 0 | 0
Realized credit losses | (2,769) | (5,714)
Acquisitions | 858 | 858
Sales, calls, other | 0 | 0
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | 27 | (3,511)
Ending Balance | 61,700 | 61,700
Unamortized Discount Net |  |
Beginning balance | 286,382 | 296,342
Amortization of net discount | (9,324) | (19,162)
Realized credit losses | 0 | 0
Acquisitions | 3,033 | 5,705
Sales, calls, other | (6,945) | (13,277)
Impairments | 0 | 0
Transfers to (release of) credit reserves, net | (27) | 3,511
Ending Balance | $ 273,119 | $ 273,119

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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
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Balance Type: | na
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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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- 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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- 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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- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
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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 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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