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Investment Securities - Narrative (Details)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
security
shares
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
security
shares
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]          
Debt securities, available-for-sale, accrued Interest $ 25.0   $ 25.0   $ 22.0
Debt Securities, held-to-maturity, accrued interest 17.0   17.0   7.0
Write off of accrued interest receivable $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Debt securities, held-to-maturity, threshold period past due 30 days   30 days    
Securities past due $ 9,832.0   $ 9,832.0   3,809.0
Held-to-maturity securities, nonaccrual 0.0   0.0   0.0
Federal Home Loan Bank stock 83.0   83.0   40.0
Non-marketable equity securities 69.0   69.0   10.0
Amortization method qualified affordable housing project investments 538.0   538.0   156.0
Asset Pledged as Collateral          
Schedule of Investments [Line Items]          
Investment securities, aggregate carrying value, pledged as collateral $ 5,200.0   $ 5,200.0   $ 5,700.0
Visa, Inc | Class B Common Stock          
Schedule of Investments [Line Items]          
Investment owned (in shares) | shares 354   354    
Residential Mortgage Backed Securities or Government Agency Securities          
Schedule of Investments [Line Items]          
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 53   53