Deposits - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2021
Statistical Disclosure for Banks [Abstract]
Deposits exceeding FDIC amount	$ 6,400.0	$ 7,600.0
Increase in demand accounts	883.0
Increase savings accounts	673.1
Decrease in certificates of deposit	142.2
Decrease brokered deposits	$ 42.9