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Mortgage Servicing - Summary of Activity in Carrying Value of Amortization Method Servicing Assets (Footnote) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Servicing Asset at Amortized Cost [Line Items]
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings	$ 0	$ 0	$ 52,015
Non Agency Mortgage Servicing Rights [Member]
Servicing Asset at Amortized Cost [Line Items]
Fair value measurement of non-agency MSRs, cumulative-effect on retained earnings			52,000
Deferred income taxes			$ 9,200

X

- Definition

Amount of deferred income tax expense (benefit) and income tax credits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 30
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612

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+ References

No definition available.

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