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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 1,044,914	$ 1,312,633	$ 1,486,395	$ 1,457,149
Sales and other transfers	(1)	(15)	(108)	(585)
Recognized on the sale of residential mortgage loans	22,096	1,235	37,785	3,933
Purchase of MSRs	32,249	10,566	78,994	124,955
Servicing transfers and adjustments	16	(3,105)	(263,427)	(7,872)
Changes in fair value:
Changes in valuation inputs or other assumptions	17,823	188,933	(138,672)	29,840
Realization of expected future cash flows and other changes	(48,084)	(54,694)	(131,954)	(151,867)
Ending balance	1,069,013	1,455,553	1,069,013	1,455,553
Fair Value Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	305,085	745,735	714,006	865,587
Sales and other transfers	0	0	0	(29)
Recognized on the sale of residential mortgage loans	22,096	1,235	37,785	3,933
Purchase of MSRs	32,249	9,298	78,994	123,600
Servicing transfers and adjustments	16	0	(263,830)	0
Changes in fair value:
Changes in valuation inputs or other assumptions	4,074	(63,360)	(159,351)	(235,036)
Realization of expected future cash flows and other changes	(23,856)	(36,898)	(67,940)	(102,045)
Ending balance	339,664	656,010	339,664	656,010
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	739,829	566,898	772,389	591,562
Sales and other transfers	(1)	(15)	(108)	(556)
Recognized on the sale of residential mortgage loans	0	0	0	0
Purchase of MSRs	0	1,268	0	1,355
Servicing transfers and adjustments	0	(3,105)	403	(7,872)
Changes in fair value:
Changes in valuation inputs or other assumptions	13,749	252,293	20,679	264,876
Realization of expected future cash flows and other changes	(24,228)	(17,796)	(64,014)	(49,822)
Ending balance	$ 729,349	$ 799,543	$ 729,349	$ 799,543

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- Definition

Servicing assets at fair value, additions recognized from mortgage sales.

+ References

No definition available.

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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

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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
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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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

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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
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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(ii)
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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

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