Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Fair value election - transfer of MSRs carried at fair value	$ 0	$ (336,882)	$ 0
Pledged MSR liability expense	(372,089)	(171,670)	(236,311)
Estimated fair value at end of year	1,486,395	1,457,149	671,962	$ 679,256
Mortgage Servicing Rights - Amortized Costs
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Beginning balance, MSRs	$ 0	336,882	363,722
Fair value election - transfer of MSRs carried at fair value		(361,670)	0
Additions recognized in connection with asset acquisitions		0	1,658
Additions recognized on the sale of mortgage loans		0	20,738
Sales		0	(1,066)
Servicing transfers and adjustments		0	252
Mortgage servicing rights, gross		(24,788)	385,304
Valuation allowance of MSRs		24,788	3,366
Pledged MSR liability expense		0	(51,788)
Ending balance, MSRs		0	336,882
Estimated fair value at end of year		$ 0	$ 418,745

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

No definition available.

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- Definition

Represents the gross value of mortgage servicing rights before amortization and impairment valuation allowance.

+ References

No definition available.

+ Details

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- Definition

Servicing Asset at Amortized Cost, Transfers and Adjustments

+ References

No definition available.

+ Details

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- Definition

Servicing Assets at Amortized Cost, Additions Recognized from Mortgage Sales

+ References

No definition available.

+ Details

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- Definition

Amortized amount of 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 4
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=116651436&loc=d3e122739-111746

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=7524895&loc=d3e120260-111741

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-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

+ Details

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- Definition

Amount of additions from purchases, assumption or transfer to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

+ Details

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- Definition

Amount of amortization of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

+ 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 conveyed to unrelated parties of contract to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

+ Details

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- Definition

Amount of increase (decrease) in the amortized amount from a decrease (increase) in the valuation allowance applied to the servicing asset for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

+ 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
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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