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Fair Value Measurements (Company's Level 3 Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Assets Held For Sale [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	$ 360,711	$ 583,909
Total gains or losses (realized/unrealized) Included in earnings	638	(48,836)
Purchases, issuances, and settlements [Abstract]
Sales		(63,712)
Settlements	(33,400)	(110,650)
Charge-offs	12,955
Ending balance	314,994	360,711
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$ (1,776)	(48,836)
Minimum [Member]
Purchases, issuances, and settlements [Abstract]
Estimated Selling Costs	7.00%
Maximum [Member]
Purchases, issuances, and settlements [Abstract]
Estimated Selling Costs	10.00%
Available For Sale Securities [Member]
Purchases, issuances, and settlements [Abstract]
Purchases	$ 43,553
Ending balance	43,553
Held-to-maturity [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	663,140	489,938
Total gains or losses (realized/unrealized) Included in earnings	20,019	(3,078)
Purchases, issuances, and settlements [Abstract]
Issuances	398,410	528,584
Sales	(701,297)	(352,304)
Ending balance	380,272	663,140
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	703	(2,674)
Investment In Unconsolidated Entity [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	126,930	178,520
Total gains or losses (realized/unrealized) Included in earnings	(20)	(39,816)
Purchases, issuances, and settlements [Abstract]
Settlements	(19,199)	(11,774)
Ending balance	107,711	126,930
The amount of total gains or losses for the period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at the reporting date	$ (20)	$ (39,816)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Section 50
-Paragraph 2
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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Section 50
-Paragraph 2
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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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