XML 94 R99.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Detail) (Residential, USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Residential |  |
Credit Reserve |  |
Beginning balance | $ 116,870 rwt_AvailableForSaleSecuritiesCreditReserve / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | $ 187,032 rwt_AvailableForSaleSecuritiesCreditReserve / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Amortization of net discount | 0 rwt_AvailableForSaleSecuritiesCreditReserveAmortizationOfNetDiscountPremium / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 0 rwt_AvailableForSaleSecuritiesCreditReserveAmortizationOfNetDiscountPremium / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Realized credit losses | (11,501)rwt_AvailableForSaleSecuritiesCreditReserveRealizedCreditGainsLosses / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (21,971)rwt_AvailableForSaleSecuritiesCreditReserveRealizedCreditGainsLosses / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Acquisitions | 3,581 rwt_AvailableForSaleSecuritiesCreditReserveAcquisitions / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 13,604 rwt_AvailableForSaleSecuritiesCreditReserveAcquisitions / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Sales, calls, other | (2,555)rwt_AvailableForSaleSecuritiesCreditReserveSalesCallsOther / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (19,868)rwt_AvailableForSaleSecuritiesCreditReserveSalesCallsOther / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Impairments | 565 rwt_AvailableForSaleSecuritiesCreditReserveImpairments / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 1,834 rwt_AvailableForSaleSecuritiesCreditReserveImpairments / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Transfers to (release of) credit reserves, net | (36,893)rwt_AvailableForSaleSecuritiesCreditReserveTransfersToReleaseOfCreditReserves / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (43,761)rwt_AvailableForSaleSecuritiesCreditReserveTransfersToReleaseOfCreditReserves / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Ending Balance | 70,067 rwt_AvailableForSaleSecuritiesCreditReserve / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 116,870 rwt_AvailableForSaleSecuritiesCreditReserve / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Unamortized Discount Net |  |
Beginning balance | 298,469 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiums / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 203,421 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiums / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Amortization of net discount | (42,835)rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAmortizationOfNetDiscountPremium / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (34,943)rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAmortizationOfNetDiscountPremium / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Realized credit losses | 0 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsRealizedCreditGainsLosses / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 0 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsRealizedCreditGainsLosses / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Acquisitions | 15,348 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAcquisitions / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 92,124 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAcquisitions / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Sales, calls, other | (11,533)rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsSalesCallsOther / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | (5,894)rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsSalesCallsOther / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Impairments | 0 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsImpairments / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 0 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsImpairments / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Transfers to (release of) credit reserves, net | 36,893 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsTransfersToReleaseOfCreditReserves / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | 43,761 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsTransfersToReleaseOfCreditReserves / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember
Ending Balance | $ 296,342 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiums / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember | $ 298,469 rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiums / invest_InvestmentSecuritiesClassAxis = us-gaap_ResidentialMortgageBackedSecuritiesMember

X
- 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

X
- Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveAbstract
Namespace Prefix: | rwt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Changes to the credit reserve on available-for-sale securities due to security acquisitions. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveAcquisitions
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to credit reserve on available-for-sale securities due to the amortization of net discount + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveAmortizationOfNetDiscountPremium
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the credit reserve on available-for-sale securities due to impairments. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveImpairments
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the credit reserve on available-for-sale securities due to realized credit losses. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveRealizedCreditGainsLosses
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the credit reserve on available-for-sale securities due to sales, calls, and other items. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveSalesCallsOther
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesCreditReserveTransfersToReleaseOfCreditReserves
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAbstract
Namespace Prefix: | rwt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Changes to the net unamortized discount on available-for-sale securities due to security acquisitions. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAcquisitions
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the net unamortized discount on available-for-sale securities due to the amortization of net discount. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAmortizationOfNetDiscountPremium
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the net unamortized discount on available-for-sale securities due to impairments. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsImpairments
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the net unamortized discount on available-for-sale securities due to realized credit losses. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsRealizedCreditGainsLosses
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Changes to the net unamortized discount on available-for-sale securities due to sales, calls, and other items. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsSalesCallsOther
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Transfers to or releases of the credit reserve on available-for-sale securities. + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsTransfersToReleaseOfCreditReserves
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration