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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ 93,901,000 |  | $ 116,029,000 | $ 116,029,000 |  |  |  |  |
Amount recognized in connection with the Homeward Acquisition |  |  |  |  | 39,800,000 |  | $ 74,800,000 |  | $ 2,900,000 |
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions |  | 9,900,000 |  | 1,200,000 |  |  |  |  |  |
Sales |  |  |  | 0 |  |  |  |  |  |
Changes in fair value: |  |  |  |  |  |  |  |  |  |
Ending balance |  | 787,344,000 |  |  | 93,901,000 |  | 116,029,000 |  |  |
Conventional [Member] |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 93,901,000 |  | 116,029,000 | 116,029,000 |  | 85,213,000 |  | 0 |
Servicing Assets at Fair Value, Additions Recognized from Mortgage Sales |  |  |  |  | 0 |  | 0 |  | 2,908,000 |
Fair value election - transfer from MSRs carried at amortized cost |  | 787,142,000 |  |  |  |  |  |  |  |
Cumulative effect of fair value election |  | 52,015,000 |  |  |  |  |  |  |  |
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions | [1] |  |  |  | (15,028,000) |  | 44,199,000 |  | 30,000 |
Sales |  | (71,318,000) |  |  |  |  |  |  |  |
Servicing transfers and adjustments |  | (1,139,000) |  |  |  |  |  |  |  |
Changes in fair value: |  |  |  |  |  |  |  |  |  |
Changes in valuation inputs or other assumptions | [2] | 9,439,000 |  |  |  |  |  |  |  |
Realization of expected future cash flows and other changes |  | (82,696,000) | [2] |  | (7,100,000) | [1] | (13,383,000) | [1] | 0 | [1]
Ending balance |  | 787,344,000 |  |  | 93,901,000 |  | 116,029,000 |  | 85,213,000 |
Fair Value Agency Mortgage Servicing Rights [Member] | Conventional [Member] |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 93,901,000 |  | 116,029,000 | 116,029,000 |  |  |  |  |
Fair value election - transfer from MSRs carried at amortized cost |  | 0 |  | 0 |  |  |  |  |  |
Cumulative effect of fair value election |  | 0 |  | 0 |  |  |  |  |  |
Sales |  | (70,084,000) |  | 0 |  |  |  |  |  |
Servicing transfers and adjustments |  | 0 |  | (934,000) |  |  |  |  |  |
Changes in fair value: |  |  |  |  |  |  |  |  |  |
Changes in valuation inputs or other assumptions | [2] | (2,592,000) |  | (12,217,000) |  |  |  |  |  |
Realization of expected future cash flows and other changes | [2] | (6,808,000) |  | (930,000) |  |  |  |  |  |
Ending balance |  | 14,417,000 |  | $ 101,948,000 | 93,901,000 |  | 116,029,000 |  |  |
Fair Value Non-Agency Mortgage Servicing Rights [Member] | Conventional [Member] |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |  |  |  |  |  |
Beginning balance |  | 0 |  |  |  |  |  |  |  |
Fair value election - transfer from MSRs carried at amortized cost |  | 787,142,000 |  |  |  |  |  |  |  |
Cumulative effect of fair value election |  | 52,015,000 |  |  |  |  |  |  |  |
Sales |  | (1,234,000) |  |  |  |  |  |  |  |
Servicing transfers and adjustments |  | (1,139,000) |  |  |  |  |  |  |  |
Changes in fair value: |  |  |  |  |  |  |  |  |  |
Changes in valuation inputs or other assumptions | [2] | 12,031,000 |  |  |  |  |  |  |  |
Realization of expected future cash flows and other changes | [2] | (75,888,000) |  |  |  |  |  |  |  |
Ending balance |  | $ 772,927,000 |  |  | 0 |  |  |  |  |
Homeward [Member] | Conventional [Member] |  |  |  |  |  |  |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |  |  |  |  |  |  |
Amount recognized in connection with the Homeward Acquisition |  |  |  |  | $ 0 |  | $ 0 |  | $ 82,275,000 |
[1] | Changes in fair value are recognized in Servicing and origination expense in the Consolidated Statements of Operations.
[2] | Changes in fair value are recognized in Servicing and origination expense in the Unaudited Consolidated Statements of Operations.

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- Definition Servicing asset at amortized value fair value election transfer to MSRs carried at fair value. + References No definition available. + Details
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- Definition Servicing Assets at Fair Value, Additions Recognized from Mortgage Sales + References No definition available. + Details
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- Definition The net increase or decrease in fair value as a result of changes in the assumptions or model used to calculate the fair value of servicing 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)(4)(i) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + 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 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=7882072&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=7882072&loc=d3e122625-111746 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The net Increase or Decrease in fair value as a result of changes in the inputs, assumptions, or model used to calculate the fair value of servicing 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)(4)(i) -URI http://asc.fasb.org/extlink&oid=7882072&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=7882072&loc=d3e122625-111746 + Details
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- Definition The net Increase or Decrease in fair value as a result of other changes that are not additions, disposals, or a result of change in the inputs, assumptions, or model used to calculate the fair value of servicing 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)(4)(ii) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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- Definition Other net Increase or Decrease in the balance in servicing assets subsequently measured at fair value. This element is for changes other than additions, disposals, changes in fair value resulting from changes in valuation inputs or changes in assumptions, or other changes in fair value. + 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)(5) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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