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Mortgage Servicing Rights - Activity for Residential First-Lien Mortgage Servicing Rights (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Balance at beginning of period | [1] |  |  | $ 118,526 |
Additions |  |  |  | 7,387 | $ 5,688
Changes in fair value due to: |  |  |  |  |
Balance at End of Period | [1] | $ 63,770 |  | 63,770 |
MSRs |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |
Balance at beginning of period |  | 111,013 | $ 126,620 | 118,526 | 191,976
Additions |  | 216 | 10,691 | 7,701 | 19,498
Sales |  | (41,038) | 0 | (52,966) | (29,559)
Changes in fair value due to: |  |  |  |  |
Changes in assumptions |  | (3,356) | (21,480) | (4,013) | (59,808)
Other changes |  | (3,065) | (5,785) | (5,478) | (12,061)
Balance at End of Period |  | $ 63,770 | $ 110,046 | $ 63,770 | $ 110,046
[1] | Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At June 30, 2017 and December 31, 2016, assets of consolidated VIEs totaled $713,404 and $798,317, respectively. At June 30, 2017 and December 31, 2016, liabilities of consolidated VIEs totaled $693,137 and $773,980, respectively. See Note 4 for further discussion.

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- Definition Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + 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=68078379&loc=d3e122625-111746 + Details
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- 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=68078379&loc=d3e122625-111746 + Details
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- 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=68078379&loc=d3e122625-111746 + Details
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- Definition Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties. + 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)(3) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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