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Mortgage Servicing - Schedule of Estimated Amortization Expense for MSRs (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2015 | Dec. 31, 2013
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Mortgage servicing rights, at fair value |  | $ 93,901 | $ 787,344 | $ 116,029
2015 [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Amortization method MSRs | [1] | 222,006 |  |
Mortgage servicing rights, at fair value | [2] | 86,112 |  |
Estimated amortization expense |  | 135,894 |  |
2016 [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Amortization method MSRs | [1] | 186,018 |  |
Mortgage servicing rights, at fair value | [2] | 73,297 |  |
Estimated amortization expense |  | 112,721 |  |
2017 [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Amortization method MSRs | [1] | 174,097 |  |
Mortgage servicing rights, at fair value | [2] | 65,527 |  |
Estimated amortization expense |  | 108,570 |  |
2018 [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Amortization method MSRs | [1] | 158,107 |  |
Mortgage servicing rights, at fair value | [2] | 58,592 |  |
Estimated amortization expense |  | 99,515 |  |
2019 [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Amortization method MSRs | [1] | 138,495 |  |
Mortgage servicing rights, at fair value | [2] | 52,402 |  |
Estimated amortization expense |  | $ 86,093 |  |
[1] | Estimated amortization expense for all MSRs accounted for using the amortization method as of December 31, 2014, calculated based on assumptions used at December 31, 2014.
[2] | Estimated amortization expense attributed to non-Agency MSRs accounted for using the amortization method as of December 31, 2014 for which we subsequently elected to account for using the fair value measurement method effective January 1, 2015.

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- Definition Amortized amount of 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 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + Details
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- Definition Amount of amortization of 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)(4) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122739-111746 + 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=7882072&loc=d3e122625-111746 + Details
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