Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands	3 Months Ended
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

Servicing Asset at Fair Value, Reclassification To Changes in Valuation Inputs or Assumptions

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- Definition

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

+ References

No definition available.

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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

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-Publisher FASB
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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
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-Paragraph 3
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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