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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance |  | $ 679,256 | $ 761,190
Sales |  | (230) | (143)
Servicing transfers and adjustments |  | (1,417) | (1,275)
Changes in fair value: |  |  |
Changes in valuation inputs or other assumptions | [1] | 36 | (5,033)
Realization of expected future cash flows and other changes | [1] | (51,995) | (54,071)
Ending balance |  | 625,650 | 700,668
Fair Value Agency Mortgage Servicing Rights [Member] |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance |  | 13,357 | 15,071
Sales |  | 0 | 0
Servicing transfers and adjustments |  | 0 | 0
Changes in fair value: |  |  |
Changes in valuation inputs or other assumptions | [1] | 36 | (5,033)
Realization of expected future cash flows and other changes | [1] | (950) | (855)
Ending balance |  | 12,443 | 9,183
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |
Beginning balance |  | 665,899 | 746,119
Sales |  | (230) | (143)
Servicing transfers and adjustments |  | (1,417) | (1,275)
Changes in fair value: |  |  |
Changes in valuation inputs or other assumptions | [1] | 0 | 0
Realization of expected future cash flows and other changes | [1] | (51,045) | (53,216)
Ending balance |  | $ 613,207 | $ 691,485
[1] | Changes in fair value are recognized in Servicing and origination expense in the unaudited consolidated statements of operations.

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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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- Details
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