Employee Benefit Plans (Present Value of Accrued Liability) (Details) (Executives Directors And Officer Of Acquired Entities [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Executives Directors And Officer Of Acquired Entities [Member]
Present Value Of Accrued Liabilitiy [Roll Forward]
Present value of accrued liability as of January 1	$ 23,960	$ 25,851
Executive compensation liability acquired from 1st Financial	1,455	0
Executive compensation liability acquired from Bancorporation	10,288	0
Benefit expense	2,682	1,151
Benefits paid	(2,431)	(3,042)
Benefits forfeited	0	0
Present value of accrued liability as of December 31	$ 35,954	$ 23,960