Goodwill and Other Intangible Assets (Schedule of Goodwill) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 452,390
Reallocation	0
Acquisition	29,923
Divestiture	(2,462)
Goodwill, ending balance	479,851
Wholesale Banking Reporting Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	171,636
Reallocation	4,197
Acquisition	0
Divestiture	0
Goodwill, ending balance	175,833
Community Banking Reporting Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	141,622
Reallocation	0
Acquisition	29,923
Divestiture	0
Goodwill, ending balance	171,545
Consumer Banking Reporting Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	114,701
Reallocation	0
Acquisition	0
Divestiture	0
Goodwill, ending balance	114,701
Wealth Management Reporting Unit
Goodwill [Roll Forward]
Goodwill, beginning balance	24,431
Reallocation	(4,197)
Acquisition	0
Divestiture	(2,462)
Goodwill, ending balance	$ 17,772