Goodwill And Other Intangible Assets (Goodwill Assets by Business Segment) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 405,634
Goodwill Acquired	69,398
Impairment Loss	0
Goodwill Adjustments	(2,866)
Ending balance	472,166
Community banking
Goodwill [Roll Forward]
Beginning balance	331,752
Goodwill Acquired	69,398
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	401,150
Specialty finance
Goodwill [Roll Forward]
Beginning balance	41,768
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	(2,866)
Ending balance	38,902
Wealth management
Goodwill [Roll Forward]
Beginning balance	32,114
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	$ 32,114