XML 101 R86.htm IDEA: XBRL DOCUMENT v3.3.1.900

Commercial Loans - Geographic Concentrate of Commercial Loans Recorded on Consolidated Balance Sheet (Detail)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Commercial Loans Held For Sale
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Commercial Loans Held For Sale | Nevada
Concentration Risk [Line Items]
Concentration risk percentage	45.00%	0.00%
Commercial Loans Held For Sale | Virginia
Concentration Risk [Line Items]
Concentration risk percentage	26.00%	0.00%
Commercial Loans Held For Sale | Florida
Concentration Risk [Line Items]
Concentration risk percentage	18.00%	0.00%
Commercial Loans Held For Sale | Illinois
Concentration Risk [Line Items]
Concentration risk percentage	11.00%	0.00%
Commercial Loans Held For Sale | California
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	6.00%
Commercial Loans Held For Sale | New York
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Sale | Michigan
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	18.00%
Commercial Loans Held For Sale | Washington, District of Columbia
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	25.00%
Commercial Loans Held For Sale | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	17.00%
Commercial Loans Held For Sale | Connecticut
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	10.00%
Commercial Loans Held For Sale | Texas
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	9.00%
Commercial Loans Held For Sale | Maryland
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	7.00%
Commercial Loans Held For Sale | North Carolina
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Sale | Other states
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	8.00%
Concentration risk percentage per other state	5.00%	5.00%
Commercial Loans Held For Investment
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%
Commercial Loans Held For Investment | Nevada
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | Virginia
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | Florida
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	17.00%
Commercial Loans Held For Investment | Illinois
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | California
Concentration Risk [Line Items]
Concentration risk percentage	22.00%	19.00%
Commercial Loans Held For Investment | New York
Concentration Risk [Line Items]
Concentration risk percentage	19.00%	18.00%
Commercial Loans Held For Investment | Michigan
Concentration Risk [Line Items]
Concentration risk percentage	10.00%	8.00%
Commercial Loans Held For Investment | Washington, District of Columbia
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | Colorado
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | Connecticut
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | Texas
Concentration Risk [Line Items]
Concentration risk percentage	5.00%	0.00%
Commercial Loans Held For Investment | Maryland
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	0.00%
Commercial Loans Held For Investment | North Carolina
Concentration Risk [Line Items]
Concentration risk percentage	0.00%	6.00%
Commercial Loans Held For Investment | Other states
Concentration Risk [Line Items]
Concentration risk percentage	34.00%	32.00%
Concentration risk percentage per other state	5.00%	5.00%

X

- Definition

Concentration Risk, Percentage, Per Other State

+ References

No definition available.

+ Details

Name:	rwt_ConcentrationRiskPercentagePerOtherState
Namespace Prefix:	rwt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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_CommercialLoansHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_StatementGeographicalAxis=stpr_DC
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_CT
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_MD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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