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, 2015	Dec. 31, 2014
Present Value Of Accrued Liability [Roll Forward]
Present value of accrued liability as of January 1	$ 43,211	$ 23,960
Executive compensation liability acquired from 1st Financial	0	1,455
Executive compensation liability acquired from Bancorporation	0	17,333
Benefit expense	1,386	2,682
Benefits paid	(4,485)	(2,219)
Benefits forfeited	(234)	0
Present value of accrued liability as of December 31	$ 39,878	$ 43,211