Deposits - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Banking and Thrift, Other Disclosures [Abstract]
Deposits	$ 21,194,026,000		$ 20,828,124,000
Brokered deposits	10,000,000,000		10,100,000,000
Retail and other deposits	11,200,000,000		10,700,000,000
Stable interest-bearing deposits, total	7,800,000,000		7,300,000,000
Brokered deposit placement fee	3,000,000	$ 4,000,000
Third party broker fees paid	2,000,000	$ 0
Deposits exceeding FDIC insurance limits	532,000,000		743,000,000
Accrued interest on deposits	$ 42,000,000		$ 35,000,000