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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance |  | $ 671,962 | $ 679,256
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance |  | 336,882 |
Cumulative effect of fair value election |  | 82,043 |
Sales and other transfers |  | (6,125) | (2,672)
Additions |  | 8,809 |
Servicing transfers and adjustments |  | (2,594) | 0
Changes in fair value: |  |  |
Changes in valuation inputs or other assumptions | [1] | 18,793 | 2,172
Realization of expected future cash flows and other changes | [1] | (110,488) | (80,609)
Ending balance |  | 999,282 | 598,147
Fair Value Agency Mortgage Servicing Rights [Member] |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance |  | 11,960 | 13,357
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance |  | 336,882 |
Cumulative effect of fair value election |  | 82,043 |
Sales and other transfers |  | (5,950) |
Additions |  | 8,809 |
Changes in fair value: |  |  |
Changes in valuation inputs or other assumptions | [1] | 19,217 | (131)
Realization of expected future cash flows and other changes | [1] | (43,545) | (1,385)
Ending balance |  | 409,416 | 11,841
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance |  | 660,002 | 665,899
Sales and other transfers |  | (175) | (2,672)
Servicing transfers and adjustments |  | (2,594) | 0
Changes in fair value: |  |  |
Changes in valuation inputs or other assumptions | [1] | (424) | 2,303
Realization of expected future cash flows and other changes | [1] | (66,943) | (79,224)
Ending balance |  | $ 589,866 | $ 586,306
[1] | Changes in fair value are recognized in MSR valuation adjustments, net in the unaudited consolidated statements of operations.

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- Definition Servicing asset at amortized value net of valuation allowance fair value election transfer to MSRs carried at fair value. + References No definition available. + Details
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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + 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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- 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=68078379&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 Amount of increase (decrease) in fair value from changes in the inputs, assumptions, or model used to calculate the fair value of the 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 3 -Subparagraph (a)(4)(i) -URI http://asc.fasb.org/extlink&oid=68078379&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=68078379&loc=d3e122625-111746 + Details
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- Definition Amount of increase (decrease) from changes in fair value classified as other for a 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 3 -Subparagraph (a)(4)(ii) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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- Definition Amount of increase (decrease) in fair value from changes classified as other for a 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 3 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746 + Details
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