Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 1,486,395	$ 1,457,149	$ 671,962
Fair value election - Transfer from MSRs carried at amortized cost	0	0	336,882
Cumulative effect of fair value election	0	0	82,043
Sales	(143)	(4,344)	(6,240)
Recognized on the sale of residential mortgage loans	68,734	8,795	8,279
Recognized in connection with the acquisition of PHH	0	0	518,127
Purchase of MSRs	285,134	153,505	5,433
Servicing transfers and adjustments	(265,845)	(7,309)	(5,880)
Changes in valuation inputs or assumptions	(106,202)	93,953	5,853
Realization of expected future cash flows and other changes	(173,256)	(215,354)	(159,310)
Ending balance	1,294,817	1,486,395	1,457,149
Fair Value Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	714,006	865,587	11,960
Fair value election - Transfer from MSRs carried at amortized cost	0	0	336,882
Cumulative effect of fair value election	0	0	82,043
Sales	0	(3,578)	(4,748)
Recognized on the sale of residential mortgage loans	68,734	8,795	8,279
Recognized in connection with the acquisition of PHH	0	0	494,348
Purchase of MSRs	285,134	153,505	5,433
Servicing transfers and adjustments	(266,248)	0	(1,047)
Changes in valuation inputs or assumptions	(133,072)	(171,050)	11,558
Realization of expected future cash flows and other changes	(89,597)	(139,253)	(79,121)
Ending balance	578,957	714,006	865,587
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	772,389	591,562	660,002
Fair value election - Transfer from MSRs carried at amortized cost	0	0	0
Cumulative effect of fair value election	0	0	0
Sales	(143)	(766)	(1,492)
Recognized on the sale of residential mortgage loans	0	0	0
Recognized in connection with the acquisition of PHH	0	0	23,779
Purchase of MSRs	0	0	0
Servicing transfers and adjustments	403	(7,309)	(4,833)
Changes in valuation inputs or assumptions	26,870	265,003	(5,705)
Realization of expected future cash flows and other changes	(83,659)	(76,101)	(80,189)
Ending balance	$ 715,860	$ 772,389	$ 591,562

Servicing asset at amortized value fair value election transfer to MSRs carried at fair value.

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired during the current period through business acquisitions.

+ References

No definition available.

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

+ References

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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

No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 30
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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
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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
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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.

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No definition available.

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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
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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
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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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