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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Beginning balance | $ 1,294,817 | $ 1,486,395
Sales and other transfers | 0 | (56)
Recognized on the sale of residential mortgage loans | 34,260 | 5,930
Purchase of MSRs | 36,778 | 31,490
Servicing transfers and adjustments | (528) | (264,523)
Changes in fair value: |  |
Changes in valuation inputs or other assumptions | 84,015 | (160,661)
Realization of expected future cash flows and other changes | (49,125) | (48,347)
Ending balance | 1,400,217 | 1,050,228
Reclassification to changes in valuation inputs or assumptions | 4,500 |
Fair Value Agency Mortgage Servicing Rights |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Beginning balance | 578,957 | 714,006
Sales and other transfers | 0 | 0
Recognized on the sale of residential mortgage loans | 34,260 | 5,930
Purchase of MSRs | 36,778 | 31,490
Servicing transfers and adjustments | 29 | (263,630)
Changes in fair value: |  |
Changes in valuation inputs or other assumptions | 82,486 | (166,532)
Realization of expected future cash flows and other changes | (23,847) | (27,037)
Ending balance | 708,663 | 294,227
Fair Value Non-Agency Mortgage Servicing Rights |  |
Servicing Asset at Fair Value, Amount [Roll Forward] |  |
Beginning balance | 715,860 | 772,389
Sales and other transfers | 0 | (56)
Recognized on the sale of residential mortgage loans | 0 | 0
Purchase of MSRs | 0 | 0
Servicing transfers and adjustments | (557) | (893)
Changes in fair value: |  |
Changes in valuation inputs or other assumptions | 1,529 | 5,871
Realization of expected future cash flows and other changes | (25,278) | (21,310)
Ending balance | $ 691,554 | $ 756,001

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- Definition Servicing Asset at Fair Value, Reclassification To Changes in Valuation Inputs or Assumptions + 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 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=116651436&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745 + 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/2009/role/commonPracticeRef -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=116651436&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=116651436&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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122625-111746 + Details
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