XML 106 R92.htm IDEA: XBRL DOCUMENT
v3.21.1

Real Estate Securities - Changes of Unamortized Discount and Designated Credit Reserves on Residential Available for Sale Securities (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($)
Credit Reserve |
Beginning balance | $ 388
Sales, calls, other | 0
Ending Balance | 13
Unamortized Discount, Net |
Beginning balance | 95,718
Ending Balance | 94,188
Residential |
Credit Reserve |
Beginning balance | 44,967
Amortization of net discount | 0
Realized credit losses | (137)
Acquisitions | 1,935
Sales, calls, other | (274)
Transfers to (release of) credit reserves, net | (1,544)
Ending Balance | 44,947
Unamortized Discount, Net |
Beginning balance | 95,718
Amortization of net discount | (1,614)
Realized credit losses | 0
Acquisitions | 840
Sales, calls, other | (2,300)
Transfers to (release of) credit reserves, net | 1,544
Ending Balance | $ 94,188

X
- Definition Available For Sale Securities Unamortized Discounts Premiums [Abstract] [Roll Forward] + References No definition available. + Details
Name: | rwt_AvailableForSaleSecuritiesUnamortizedDiscountsPremiumsAbstractRollForward
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 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

X
- Definition Debt Securities, Available For Sale, Unamortized Discounts Premiums + References No definition available. + Details
Name: | rwt_DebtSecuritiesAvailableForSaleUnamortizedDiscountsPremiums
Namespace Prefix: | rwt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of decrease in allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) from sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922900-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossSecuritiesSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) for expected credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), from change in present value of expected cash flows. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82922868-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922897-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |