Goodwill and Other Intangible Assets (Goodwill Assets by Business Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 471,761
Goodwill Acquired	24,652
Impairment Loss	0
Goodwill Adjustments	2,174
Ending balance	498,587
Community banking
Goodwill [Roll Forward]
Beginning balance	401,612
Goodwill Acquired	24,652
Impairment Loss	0
Goodwill Adjustments	1,517
Ending balance	427,781
Specialty finance
Goodwill [Roll Forward]
Beginning balance	38,035
Goodwill Acquired	0
Impairment Loss	0
Ending balance	38,692
Wealth management
Goodwill [Roll Forward]
Beginning balance	32,114
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	$ 32,114