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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Footnote) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Proceeds from sale of mortgage servicing rights | $ 598,059 | $ 287 | $ 287 | $ 34,754 | $ 0
Deferred gain on sale of MSRs |  |  |  | $ 5,100 |
OneWest MSR Transaction [Member] |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Unpaid principal balance acquired |  |  | 1,100,000 |  |
Servicing advances acquired |  |  | 34,300 |  |
Greenpoint MSR Transaction [Member] |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Unpaid principal balance acquired |  |  | 7,300,000 |  |
Servicing advances acquired |  |  | 469,700 |  |
Mortgage Servicing Rights [Member] | OneWest MSR Transaction [Member] |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Unpaid principal balance acquired |  |  | 70,100,000 |  |
Servicing advances acquired |  |  | 2,100,000 |  |
Mortgage Servicing Rights [Member] | Greenpoint MSR Transaction [Member] |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Unpaid principal balance acquired |  |  | 948,900 |  |
Servicing advances acquired |  |  | 47,600 |  |
Non Agency Mortgage Servicing Rights [Member] |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings |  |  | 52,000 |  |
Deferred income taxes |  |  | 9,200 |  |
Unpaid principal balance of MSRs |  |  | $ 195,300,000 |  |

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- Definition Represents the unpaid principal balance of loans related to servicing acquired in connection with the acquisition of servicing assets. + References No definition available. + Details
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- Definition Amount of deferred income tax expense (benefit) and income tax credits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition The cash inflow from the sale of servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 3: 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 + Details
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