Goodwill and Other Intangible Assets (Accumulated Amortization of Intangible Asset Schedule) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accumulated amortization of intangible assets
Gross Carrying Amount	$ 96,561	$ 96,561
Accumulated Amortization	(35,933)	(25,541)
Net Carrying Amount	60,628	71,020
Core Deposits
Accumulated amortization of intangible assets
Gross Carrying Amount	82,323	82,323
Accumulated Amortization	(28,304)	(19,996)
Net Carrying Amount	54,019	62,327
Lease Agreements
Accumulated amortization of intangible assets
Gross Carrying Amount	238	238
Accumulated Amortization	(212)	(176)
Net Carrying Amount	26	62
Customer Relationships
Accumulated amortization of intangible assets
Gross Carrying Amount	14,000	14,000
Accumulated Amortization	(7,417)	(5,369)
Net Carrying Amount	$ 6,583	$ 8,631
Estimated useful life	12 years
Minimum | Core Deposits
Accumulated amortization of intangible assets
Estimated useful life	10 years
Maximum | Core Deposits
Accumulated amortization of intangible assets
Estimated useful life	15 years