Business Combinations (Merger Related Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Total Merger related expense	$ 82,317	$ 8,836	$ 2,338
Sterling Financial Corporation [Member]
Business Acquisition [Line Items]
Personnel	18,837
Legal and professional	22,276
Charitable contributions	10,000
Investment banking fees	9,573
Contract termination	10,378
Communication	2,522
Other	8,731
Total Merger related expense	$ 82,317