Goodwill And Other Intangible Assets (Goodwill Assets by Business Segment) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Goodwill [Roll Forward]
Beginning balance		$ 573,141
Goodwill Acquired		10,726
Impairment Loss		0
Goodwill Adjustments		448
Ending balance	$ 584,315	584,315
Community banking
Goodwill [Roll Forward]
Beginning balance		465,085
Goodwill Acquired	10,800	10,726
Impairment Loss		0
Goodwill Adjustments		123
Ending balance	475,934	475,934
Specialty finance
Goodwill [Roll Forward]
Beginning balance		38,343
Goodwill Acquired		0
Impairment Loss		0
Goodwill Adjustments		665
Ending balance	39,008	39,008
Wealth management
Goodwill [Roll Forward]
Beginning balance		69,713
Goodwill Acquired		0
Impairment Loss		0
Goodwill Adjustments		(340)
Ending balance	$ 69,373	$ 69,373