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Mortgage Servicing Rights - Details of Retention and Purchase of MSRs (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized |  |  | $ 7,387 | $ 7,679
MSRs |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | $ 256 | $ 3,443 | 7,957 | $ 22,941
Associated Principal | 41,263 |  | 781,858 |
MSRs | Jumbo Loans |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 0 |  | 7,386 |
Associated Principal | 0 |  | 686,263 |
MSRs | Jumbo Loans | From securitization |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 0 |  | 7,123 |
Associated Principal | 0 |  | 654,605 |
MSRs | Jumbo Loans | From loan sales |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 0 |  | 263 |
Associated Principal | 0 |  | 31,658 |
MSRs | Conforming Loans | From purchases |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 256 |  | 571 |
Associated Principal | $ 41,263 |  | $ 95,595 |

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- Definition Mortgage Servicing Rights [Line Items] + References No definition available. + Details
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- Definition Amount of additions from purchases, assumption or transfer to 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 4 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + 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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