XML 120 R106.htm IDEA: XBRL DOCUMENT v3.8.0.1

Mortgage Banking Activities, Net - Components of Mortgage Banking Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Mortgage Loans on Real Estate [Line Items]
Mortgage banking activities, net	$ 21,200	$ 9,766	$ 50,850	$ 24,712
Residential Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Other income, net	142	382	1,515	606
Mortgage banking activities, net	21,200	9,766	50,850	26,774
Residential Mortgage Banking Activities | Residential loans, at fair value
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of assets	28,135	12,671	63,122	47,456
Residential Mortgage Banking Activities | Sequoia securities
Mortgage Loans on Real Estate [Line Items]
Changes in fair value of assets	0	0	0	1,455
Residential Mortgage Banking Activities | Risk management derivatives, net
Mortgage Loans on Real Estate [Line Items]
Risk management derivatives	(7,077)	(3,287)	(13,787)	(22,743)
Commercial Mortgage Banking Activities
Mortgage Loans on Real Estate [Line Items]
Mortgage banking activities, net	$ 0	$ 0	$ 0	$ (2,062)

X

- Definition

Increase (Decrease) in Fair Value Adjustments on Assets

+ References

No definition available.

+ Details

Name:	rwt_IncreaseDecreaseinFairValueAdjustmentsonAssets
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The net income attributable to mortgage banking activities. This includes market valuations related to residential and commercial loans, Sequoia IOs, and mortgage banking derivatives, as well as realized gains or losses associated with mortgage loan sales.

+ References

No definition available.

+ Details

Name:	rwt_MortgageBankingActivitiesNet
Namespace Prefix:	rwt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of unrealized gain (loss) related to the fair value of price risk derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

+ Details

Name:	us-gaap_IncreaseDecreaseInFairValueOfPriceRiskFairValueHedgingInstruments1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of fee and financial service revenue classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_RevenueOtherFinancialServices
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rwt_ResidentialMortgageBankingActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_ResidentialLoansAtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=rwt_SequoiaSecuritizationEntitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_PriceRiskDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=rwt_CommercialMortgageBankingActivitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: