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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | $ 761,190 | $ 93,901 |
Fair value election - transfer from MSRs carried at amortized cost |  | 0 | 787,142 |
Cumulative effect of fair value election |  | 0 | 52,015 |
Sales |  | (148) | (72,274) |
Additions recognized on the sale of residential mortgage loans |  | 0 | 1,007 |
Servicing transfers and adjustments |  | (1,548) | (2,428) |
Changes in valuation inputs or other assumptions | [1] | 305 | 10,045 |
Realization of expected future cash flows and other changes | [1] | (80,543) | (108,218) |
Ending balance |  | 679,256 | 761,190 | $ 93,901
Fair Value Agency Mortgage Servicing Rights [Member] |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | 15,071 | 93,901 | 116,029
Fair value election - transfer from MSRs carried at amortized cost |  | 0 | 0 | 0
Cumulative effect of fair value election |  | 0 | 0 | 0
Sales |  | (3) | (70,930) | 0
Additions recognized on the sale of residential mortgage loans |  | 0 | 0 | 0
Servicing transfers and adjustments |  | 0 | 0 | 0
Changes in valuation inputs or other assumptions | [1] | 305 | (639) | (15,028)
Realization of expected future cash flows and other changes | [1] | (2,016) | (7,261) | (7,100)
Ending balance |  | 13,357 | 15,071 | 93,901
Fair Value Non-Agency Mortgage Servicing Rights [Member] |  |  |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |  |  |
Beginning balance |  | 746,119 | 0 |
Fair value election - transfer from MSRs carried at amortized cost |  | 0 | 787,142 |
Cumulative effect of fair value election |  | 0 | 52,015 |
Sales |  | (145) | (1,344) |
Additions recognized on the sale of residential mortgage loans |  | 0 | 1,007 |
Servicing transfers and adjustments |  | (1,548) | (2,428) |
Changes in valuation inputs or other assumptions | [1] | 0 | 10,684 |
Realization of expected future cash flows and other changes | [1] | (78,527) | (100,957) |
Ending balance |  | $ 665,899 | $ 746,119 | $ 0
[1] | Changes in fair value are recognized in Servicing and origination expense 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 Servicing assets at fair value, additions recognized from mortgage sales. + 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 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 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 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 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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