XML 90 R75.htm IDEA: XBRL DOCUMENT v3.3.1.900

Residential Loans - Geographic Concentration of Residential Loans Recorded on Consolidated Balance Sheet (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Residential Loans Held For Sale
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Residential Loans Held For Sale | California
Concentration Risk [Line Items]
Concentration risk percentage	41.00%	39.00%
Residential Loans Held For Sale | Texas
Concentration Risk [Line Items]
Concentration risk percentage	9.00%	9.00%
Residential Loans Held For Sale | Washington
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	5.00%
Residential Loans Held For Sale | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	0.00%
Residential Loans Held For Sale | Florida
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	4.00%
Residential Loans Held For Sale | Virginia
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	5.00%
Residential Loans Held For Sale | Georgia
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	2.00%
Residential Loans Held For Sale | Massachusetts
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	6.00%
Residential Loans Held For Sale | New York
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	2.00%
Residential Loans Held For Sale | Other states
Concentration Risk [Line Items]
Concentration risk percentage	26.00%	28.00%
Residential Loans Held for Investment
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Residential Loans Held for Investment | California
Concentration Risk [Line Items]
Concentration risk percentage	18.00%	20.00%
Residential Loans Held for Investment | Texas
Concentration Risk [Line Items]
Concentration risk percentage	6.00%	5.00%
Residential Loans Held for Investment | Washington
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%
Residential Loans Held for Investment | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	0.00%
Residential Loans Held for Investment | Florida
Concentration Risk [Line Items]
Concentration risk percentage	14.00%	13.00%
Residential Loans Held for Investment | Virginia
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	3.00%
Residential Loans Held for Investment | Georgia
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	5.00%
Residential Loans Held for Investment | Massachusetts
Concentration Risk [Line Items]
Concentration risk percentage	2.00%	2.00%
Residential Loans Held for Investment | New York
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	8.00%
Residential Loans Held for Investment | Other states
Concentration Risk [Line Items]
Concentration risk percentage	39.00%	42.00%
Residential Loans Held For Investment at Fair Value
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Residential Loans Held For Investment at Fair Value | California
Concentration Risk [Line Items]
Concentration risk percentage	39.00%	24.00%
Residential Loans Held For Investment at Fair Value | Texas
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	14.00%
Residential Loans Held For Investment at Fair Value | Washington
Concentration Risk [Line Items]
Concentration risk percentage	3.00%	4.00%
Residential Loans Held For Investment at Fair Value | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	8.00%
Residential Loans Held For Investment at Fair Value | Florida
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	6.00%
Residential Loans Held For Investment at Fair Value | Virginia
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	7.00%
Residential Loans Held For Investment at Fair Value | Georgia
Concentration Risk [Line Items]
Concentration risk percentage	1.00%	0.00%
Residential Loans Held For Investment at Fair Value | Massachusetts
Concentration Risk [Line Items]
Concentration risk percentage	4.00%	5.00%
Residential Loans Held For Investment at Fair Value | New York
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	3.00%
Residential Loans Held For Investment at Fair Value | Other states
Concentration Risk [Line Items]
Concentration risk percentage	24.00%	29.00%

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

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611

+ Details

Name:	us-gaap_ConcentrationRiskPercentage1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_TX
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_WA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_CO
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_FL
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_VA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_GA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_MA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_NY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=rwt_OtherStateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansHeldForInvestmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=rwt_ResidentialLoansHeldForInvestmentAtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: