Business Combinations (Schedule of Merger-Related Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Professional fees	$ 25,483	$ 25,823	$ 24,170
Communications	11,974	11,573	11,214
Total	8,836	2,338	360
Merged Companies [Member]
Business Acquisition [Line Items]
Professional fees	7,755	1,145	173
Compensation and relocation	158	856	0
Communications	49	66	0
Premises and equipment	44	29	82
Travel	140	98	11
Other	690	144	94
Total	$ 8,836	$ 2,338	$ 360