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Mortgage Servicing - Schedule of Activity Related to MSRs - Fair Value Measurement Method (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		$ 1,457,149	$ 671,962
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance			336,882
Cumulative effect of fair value election			82,043
Sales and other transfers		(570)	(155)
Recognized on the sale of residential mortgage loans		2,698	5,885
Purchase of MSRs		114,389	0
Servicing transfers and adjustments		(4,767)	(2,375)
Changes in fair value:
Changes in valuation inputs or other assumptions	[1]	(159,093)	25,449
Realization of expected future cash flows and other changes	[1]	(97,173)	(75,696)
Ending balance		1,312,633	1,043,995
Fair Value Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		865,587	11,960
Fair value election - transfer of MSRs carried at amortized cost, net of valuation allowance			336,882
Sales and other transfers		(29)	0
Recognized on the sale of residential mortgage loans		2,698	5,885
Purchase of MSRs		114,302	0
Servicing transfers and adjustments		0	0
Changes in fair value:
Changes in valuation inputs or other assumptions	[1]	(171,676)	20,460
Realization of expected future cash flows and other changes	[1]	(65,147)	(29,633)
Ending balance		745,735	427,597
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		591,562	660,002
Sales and other transfers		(541)	(155)
Recognized on the sale of residential mortgage loans		0	0
Purchase of MSRs		87	0
Servicing transfers and adjustments		(4,767)	(2,375)
Changes in fair value:
Changes in valuation inputs or other assumptions	[1]	12,583	4,989
Realization of expected future cash flows and other changes	[1]	(32,026)	(46,063)
Ending balance		$ 566,898	$ 616,398
[1] Changes in fair value are recognized in MSR valuation adjustments, net in the unaudited consolidated statements of operations.

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- Definition

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

+ References

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

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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.

+ References

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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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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.

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