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Fair Value Measurements (Company's Level 3 Assets) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Assets Held For Sale [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	$ 304,313	$ 360,711
Total gains or losses (realized/unrealized) Included in earnings	(198)	557
Purchases, issuances, sales and settlements
Issuances	551	11,450
Sales	(35,000)
Settlements	(32,896)	(52,450)
Charge-offs	(10,744)	(15,955)
Ending balance	226,026	304,313
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	$ (198)	(4,776)
Minimum [Member]
Purchases, issuances, sales and settlements
Estimated Selling Costs	7.00%
Maximum [Member]
Purchases, issuances, sales and settlements
Estimated Selling Costs	10.00%
Available For Sale Securities [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	$ 40,644
Transfers into level 3		19,441
Transfers out of level 3	(45,998)
Included in other comprehensive income (loss)	(476)	(497)
Purchases, issuances, sales and settlements
Purchases	62,076	24,112
Settlements	(4,200)	(2,412)
Ending balance	52,046	40,644
Held-to-maturity [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	503,316	663,140
Total gains or losses (realized/unrealized) Included in earnings	18,097	19,883
Purchases, issuances, sales and settlements
Issuances	485,198	521,914
Sales	(698,141)	(701,621)
Ending balance	308,470	503,316
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	(1,909)	911
Investment In Unconsolidated Entity [Member]
Company's Level 3 assets [Roll Forward]
Beginning balance	74,473	126,930
Total gains or losses (realized/unrealized) Included in earnings	(2,981)	(20)
Purchases, issuances, sales and settlements
Settlements	(7,280)	(52,437)
Ending balance	64,212	74,473
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	$ (2,981)	$ (20)

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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.

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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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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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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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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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