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Investment Securities - Narrative (Details)
shares in Thousands, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
security
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
security
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Schedule of Investments [Line Items]          
Debt securities, available-for-sale, accrued Interest $ 29.0   $ 29.0   $ 22.0
Debt Securities, held-to-maturity, accrued interest 16.0   16.0   7.0
Write off of accrued interest receivable $ 0.0 $ 0.0 $ 0.0 $ 0.0  
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 124   124    
Debt securities, held-to-maturity, threshold period past due 30 days   30 days    
Securities past due $ 9,661.0   $ 9,661.0   3,809.0
Held-to-maturity securities, nonaccrual 0.0   0.0   0.0
Federal Home Loan Bank stock 234.0   234.0   40.0
Nonmarketable equity securities 55.0   55.0   1.0
Amortization method qualified affordable housing project investments 558.0   558.0   156.0
Total Past Due          
Schedule of Investments [Line Items]          
Securities past due 0.0   0.0   0.0
Asset Pledged as Collateral          
Schedule of Investments [Line Items]          
Investment securities, aggregate carrying value, pledged as collateral $ 3,900.0   $ 3,900.0   $ 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 118   118    
Corporate bonds          
Schedule of Investments [Line Items]          
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, number of positions | security 6   6