Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 1,787,651	$ 1,787,651
Core Deposits
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years