Acquisitions and Divestiture (Schedule of Fair Value of Net Assets Acquired Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 791,157	$ 745,523
Capital One [Member]
Business Acquisition [Line Items]
Accounts receivable	2,803
Identifiable intangible assets	27,377
Total identifiable assets	30,180
Deposit liabilities	217,432
Other liabilities	151
Total liabilities	217,583
Net liabilities assumed	(187,403)
Consideration received	141,769
Goodwill	$ 45,634