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Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | $ 671,962 | $ 679,256 | $ 761,190
Fair value election - transfer from MSRs carried at amortized cost |  | 336,882 | 0 | 0
Cumulative effect of fair value election |  | 82,043 | 0 | 0
Sales |  | (6,240) | (540) | (148)
Recognized on the sale of residential mortgage loans |  | 8,279 | 162 | 0
Recognized in connection with the acquisition of PHH |  | 518,127 | 0 | 0
Purchase of MSRs |  | 5,433 | 0 | 0
Servicing transfers and adjustments |  | (5,880) | (2,376) | (1,548)
Changes in valuation inputs or other assumptions | [1] | 5,853 | 86,964 | 305
Realization of expected future cash flows and other changes | [1] | (159,310) | (91,504) | (80,543)
Ending balance |  | 1,457,149 | 671,962 | 679,256
Fair Value Agency Mortgage Servicing Rights [Member] |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | 11,960 | 13,357 | 15,071
Fair value election - transfer from MSRs carried at amortized cost |  | 336,882 | 0 | 0
Cumulative effect of fair value election |  | 82,043 | 0 | 0
Sales |  | (4,748) | 0 | (3)
Recognized on the sale of residential mortgage loans |  | 8,279 | 162 | 0
Recognized in connection with the acquisition of PHH |  | 494,348 | 0 | 0
Purchase of MSRs |  | 5,433 | 0 | 0
Servicing transfers and adjustments |  | (1,047) | 0 | 0
Changes in valuation inputs or other assumptions | [1] | 11,558 | 243 | 305
Realization of expected future cash flows and other changes | [1] | (79,121) | (1,802) | (2,016)
Ending balance |  | 865,587 | 11,960 | 13,357
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | 660,002 | 665,899 | 746,119
Fair value election - transfer from MSRs carried at amortized cost |  | 0 | 0 | 0
Cumulative effect of fair value election |  | 0 | 0 | 0
Sales |  | (1,492) | (540) | (145)
Recognized on the sale of residential mortgage loans |  | 0 | 0 | 0
Recognized in connection with the acquisition of PHH |  | 23,779 | 0 | 0
Purchase of MSRs |  | 0 | 0 | 0
Servicing transfers and adjustments |  | (4,833) | (2,376) | (1,548)
Changes in valuation inputs or other assumptions | [1] | (5,705) | 86,721 | 0
Realization of expected future cash flows and other changes | [1] | (80,189) | (89,702) | (78,527)
Ending balance |  | $ 591,562 | $ 660,002 | $ 665,899
[1] | Changes in fair value are recognized in MSR valuation adjustments, net in the 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 The value of new servicing assets, subsequently measured at fair value, acquired during the current period through business acquisitions. + References No definition available. + Details
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- Definition Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References No definition available. + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&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://fasb.org/us-gaap/role/ref/legacyRef -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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