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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, 2017	Jun. 30, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		$ 679,256	$ 761,190
Sales		(230)	(143)
Servicing transfers and adjustments		(1,417)	(1,275)
Changes in fair value:
Changes in valuation inputs or other assumptions	[1]	36	(5,033)
Realization of expected future cash flows and other changes	[1]	(51,995)	(54,071)
Ending balance		625,650	700,668
Fair Value Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		13,357	15,071
Sales		0	0
Servicing transfers and adjustments		0	0
Changes in fair value:
Changes in valuation inputs or other assumptions	[1]	36	(5,033)
Realization of expected future cash flows and other changes	[1]	(950)	(855)
Ending balance		12,443	9,183
Fair Value Non-Agency Mortgage Servicing Rights [Member]
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance		665,899	746,119
Sales		(230)	(143)
Servicing transfers and adjustments		(1,417)	(1,275)
Changes in fair value:
Changes in valuation inputs or other assumptions	[1]	0	0
Realization of expected future cash flows and other changes	[1]	(51,045)	(53,216)
Ending balance		$ 613,207	$ 691,485
[1] Changes in fair value are recognized in Servicing and origination expense in the unaudited consolidated statements of operations.

X

- 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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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X

- 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.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(i)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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- References

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(4)(ii)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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- Definition

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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(5)
-URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122625-111746

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