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Investment Securities - Proceeds from Calls and Sales, Realized Gains and Losses and Interest Income Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Proceeds from calls and sales of investment securities and other assets        
Proceeds from calls of investment securities $ 7.5 $ 0.2 $ 7.7 $ 1.2
Proceeds from sales of investment securities 25.2 0.0 25.2 0.0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]        
Gross realized gains on sales of investment securities 0.0 0.0 0.0 0.0
Gross realized losses on sales of investment securities 0.0 0.0 0.0 0.0
Income tax benefit related to net realized loss on sale of investment securities 0.0 0.0 0.0 0.0
Interest income from taxable and nontaxable investment securities        
Interest income from taxable investment securities 33.3 31.6 67.3 60.7
Interest income from non-taxable investment securities $ 3.1 $ 3.3 $ 6.7 $ 6.3