XML 152 R105.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Activity for Residential First-Lien Mortgage Servicing Rights (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Balance at beginning of period | $ 64,824 us-gaap_ServicingAssetAtFairValueAmount |  | $ 5,315 us-gaap_ServicingAssetAtFairValueAmount |  |
Additions | 48,000 us-gaap_ServicingAssetAtFairValueAdditions |  | 44,063 us-gaap_ServicingAssetAtFairValueAdditions |  | 7,329 us-gaap_ServicingAssetAtFairValueAdditions
Balance at End of Period | 139,293 us-gaap_ServicingAssetAtFairValueAmount |  | 64,824 us-gaap_ServicingAssetAtFairValueAmount |  | 5,315 us-gaap_ServicingAssetAtFairValueAmount
Mortgage Servicing Rights |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Balance at beginning of period | 64,824 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | 5,315 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  |
Additions | 95,550 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | 47,514 us-gaap_ServicingAssetAtFairValueAdditions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  |
Changes in assumptions | (12,467)us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | [1] | 15,719 us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | [1] |
Other changes | (8,614)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | [2] | (3,724)us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember | [2] |
Balance at End of Period | $ 139,293 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  | $ 64,824 us-gaap_ServicingAssetAtFairValueAmount / us-gaap_InvestmentTypeAxis = rwt_MortgageServicingRightsMember |  |
[1] | Primarily reflects changes in prepayment assumptions due to changes in market interest rates.
[2] | Represents changes due to realization of expected cash flows.

X
- Definition The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(i) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
Name: | us-gaap_AssetAtFairValueChangesInFairValueResultingFromChangesInAssumptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
Name: | us-gaap_ServicingAssetAtFairValueAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
Name: | us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(4)(ii) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
Name: | us-gaap_ServicingAssetAtFairValueOtherChangesInFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_ServicingAssetsAtFairValueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=rwt_MortgageServicingRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |