Employee Benefit Plans (Present Value of Accrued Liability) (Details) - Executives Directors And Officer Of Acquired Entities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Present Value Of Accrued Liability [Roll Forward]
Present value of accrued liability as of January 1	$ 39,878	$ 43,211
Benefit expense	3,232	1,386
Benefits paid	(4,194)	(4,485)
Benefits forfeited	(319)	(234)
Present value of accrued liability as of December 31	$ 38,597	$ 39,878