Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Total Goodwill	$ 2.7	$ 1,800.0
Goodwill Impairment Adjustment	$ (1,800.0)
Core deposit intangible amortization period	10 years