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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
	Jan. 01, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 671,962	$ 1,312,633	$ 1,043,995	$ 1,457,149	$ 671,962
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance			0		336,882
Cumulative effect of fair value election			0		(82,043)
Servicing Asset at Fair Value, Disposals and Other Transfers				585	6,125
Sales and other transfers		15	5,970	11
Recognized on the sale of residential mortgage loans		1,235	1,503	3,933	6,080
Purchase of MSRs		10,566	1,421	124,955	2,729
Servicing transfers and adjustments		(3,105)	(219)	(7,872)	(2,594)
Changes in fair value:
Changes in valuation inputs or other assumptions		188,933	(6,656)	29,840	18,793
Realization of expected future cash flows and other changes		(54,694)	(34,792)	(151,867)	(110,488)
Ending balance		1,455,553	999,282	1,455,553	999,282
Fair Value Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	11,960	745,735	427,597	865,587	11,960
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance			0		336,882
Servicing Asset at Fair Value, Disposals and Other Transfers				29	5,950
Sales and other transfers		0	5,950
Recognized on the sale of residential mortgage loans		1,235	1,503	3,933	6,080
Purchase of MSRs		9,298	1,421	123,600	2,729
Servicing transfers and adjustments		0	0	0	0
Changes in fair value:
Changes in valuation inputs or other assumptions		(63,360)	(1,243)	(235,036)	19,217
Realization of expected future cash flows and other changes		(36,898)	(13,912)	(102,045)	(43,545)
Ending balance		656,010	409,416	656,010	409,416
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	660,002	566,898	616,398	591,562	660,002
Servicing Asset at Fair Value, Disposals and Other Transfers				556	175
Sales and other transfers		15	20
Recognized on the sale of residential mortgage loans		0	0	0	0
Purchase of MSRs		1,268	0	1,355	0
Servicing transfers and adjustments		(3,105)	(219)	(7,872)	(2,594)
Changes in fair value:
Changes in valuation inputs or other assumptions		252,293	(5,413)	264,876	(424)
Realization of expected future cash flows and other changes		(17,796)	(20,880)	(49,822)	(66,943)
Ending balance		$ 799,543	589,866	$ 799,543	589,866
Retained Earnings (Accumulated Deficit) [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Cumulative effect of fair value election					$ (82,043)
Retained Earnings (Accumulated Deficit) [Member] | Fair Value Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Cumulative effect of fair value election	$ (82,043)		$ 0

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Servicing asset at amortized value net of valuation allowance fair value election transfer to MSRs carried at fair value.

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Amount of the cumulative effect on retained earnings net of related income tax effect.

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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.

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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.

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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.

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Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

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