Mortgage Servicing - Summary of Activity Related to Fair Value Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 1,457,149	$ 671,962	$ 679,256
Fair value election - Transfer from MSRs carried at amortized cost	0	336,882	0
Cumulative effect of fair value election	0	82,043	0
Sales	(4,344)	(6,240)	(540)
Recognized on the sale of residential mortgage loans	8,795	8,279	162
Recognized in connection with the acquisition of PHH	0	518,127	0
Purchase of MSRs	153,505	5,433	0
Servicing transfers and adjustments	(7,309)	(5,880)	(2,376)
Changes in valuation inputs or other assumptions	93,953	5,853	86,964
Realization of expected future cash flows and other changes	(215,354)	(159,310)	(91,504)
Ending balance	1,486,395	1,457,149	671,962
Fair Value Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	865,587	11,960	13,357
Fair value election - Transfer from MSRs carried at amortized cost	0	336,882	0
Cumulative effect of fair value election	0	82,043	0
Sales	(3,578)	(4,748)	0
Recognized on the sale of residential mortgage loans	8,795	8,279	162
Recognized in connection with the acquisition of PHH	0	494,348	0
Purchase of MSRs	153,505	5,433	0
Servicing transfers and adjustments	0	(1,047)	0
Changes in valuation inputs or other assumptions	(171,050)	11,558	243
Realization of expected future cash flows and other changes	(139,253)	(79,121)	(1,802)
Ending balance	714,006	865,587	11,960
Fair Value Non-Agency Mortgage Servicing Rights
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	591,562	660,002	665,899
Fair value election - Transfer from MSRs carried at amortized cost	0	0	0
Cumulative effect of fair value election	0	0	0
Sales	(766)	(1,492)	(540)
Recognized on the sale of residential mortgage loans	0	0	0
Recognized in connection with the acquisition of PHH	0	23,779	0
Purchase of MSRs	0	0	0
Servicing transfers and adjustments	(7,309)	(4,833)	(2,376)
Changes in valuation inputs or other assumptions	265,003	(5,705)	86,721
Realization of expected future cash flows and other changes	(76,101)	(80,189)	(89,702)
Ending balance	$ 772,389	$ 591,562	$ 660,002

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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- Definition

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

+ References

No definition available.

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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
-Topic 825
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-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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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
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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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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

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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://fasb.org/us-gaap/role/ref/legacyRef
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