Goodwill (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020
Goodwill [Roll Forward]
Goodwill, Gross, Beginning Balance	$ 1,900,727
Goodwill, Impaired, Accumulated Impairment Loss, Impaired, Beginning Balance	113,076
Goodwill, Beginning Balance	1,787,651
Goodwill impairment	(1,784,936)	$ 0
Goodwill, Period Increase (Decrease)	1,784,936
Goodwill, Gross, Ending Balance	1,900,727
Goodwill, Impaired, Accumulated Impairment Loss, Ending Balance	113,076		$ 1,898,012
Goodwill, Ending Balance	2,715
Wholesale Bank
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,033,744
Goodwill impairment	(1,033,744)
Goodwill, Ending Balance	0
Wealth Management
Goodwill [Roll Forward]
Goodwill, Beginning Balance	2,715
Goodwill impairment	0
Goodwill, Ending Balance	2,715
Retail Bank
Goodwill [Roll Forward]
Goodwill, Beginning Balance	751,192
Goodwill impairment	(751,192)
Goodwill, Ending Balance	$ 0