Goodwill And Other Intangible Assets (Goodwill Assets by Business Segment) (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 471,761
Goodwill Acquired	11,470
Impairment Loss	0
Goodwill Adjustments	2,707
Ending balance	485,938
Community banking
Goodwill [Roll Forward]
Beginning balance	401,612
Goodwill Acquired	11,470
Impairment Loss	0
Goodwill Adjustments	1,517
Ending balance	414,599
Specialty finance
Goodwill [Roll Forward]
Beginning balance	38,035
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	1,190
Ending balance	39,225
Wealth management
Goodwill [Roll Forward]
Beginning balance	32,114
Goodwill Acquired	0
Impairment Loss	0
Goodwill Adjustments	0
Ending balance	$ 32,114