Business Combinations (Merger Related Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Total Merger related expense	$ 45,582	$ 82,317	$ 8,836
Sterling Financial Corporation [Member]
Business Acquisition [Line Items]
Legal and professional	21,849	22,276
Personnel	11,564	18,837
Premises and equipment	6,640	3,677
Communication	2,309	2,522
Contract termination	154	10,378
Charitable contributions	0	10,000
Investment banking fees	0	9,573
Other	3,066	5,054
Total Merger related expense	$ 45,582	$ 82,317