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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized |  |  | $ 7,679 | $ 52,297
MSRs |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | $ 3,443 | $ 22,760 | 22,941 | $ 73,976
Associated Principal | 548,281 |  | 2,605,523 |
MSRs | Jumbo Loan |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 1,992 |  | 4,247 |
Associated Principal | 331,737 |  | 659,471 |
MSRs | Jumbo Loan | From securitization |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 1,971 |  | 4,102 |
Associated Principal | 328,227 |  | 638,469 |
MSRs | Jumbo Loan | From loan sales |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 21 |  | 145 |
Associated Principal | 3,510 |  | 21,002 |
MSRs | Conforming Loan |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 1,451 |  | 18,694 |
Associated Principal | 216,544 |  | 1,946,052 |
MSRs | Conforming Loan | From loan sales |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 0 |  | 3,380 |
Associated Principal | 0 |  | 316,290 |
MSRs | Conforming Loan | From purchases |  |  |  |
Mortgage Servicing Rights [Line Items] |  |  |  |
MSRs recognized | 1,451 |  | 15,314 |
Associated Principal | $ 216,544 |  | $ 1,629,762 |

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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=56950315&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=56950315&loc=d3e122625-111746 + Details
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