Subsequent Events (Details) - USD ($)	Apr. 30, 2020	Apr. 20, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Subsequent Event [Line Items]
Loans and leases			$ 20,891,524,000	$ 20,036,986,000	$ 18,814,290,000
HSA			$ 6,736,178,000	$ 6,416,135,000
Number of loan applications	$ 9,000
Subsequent Event
Subsequent Event [Line Items]
Loans and leases	1,400,000,000
Number of Deposit Accounts		$ 24,000
HSA		$ 140,000,000
Subsequent Event | Payment Protection Program [Member]
Subsequent Event [Line Items]
Loans and leases	1,200,000,000
Number of Loans	7,000
Subsequent Event | CARES Act [Member]
Subsequent Event [Line Items]
Loans and leases	$ 2,200,000,000