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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
Mar. 31, 2022
Mar. 31, 2021
Proceeds from calls and sales of investment securities and other assets    
Proceeds from calls of investment securities $ 1.0 $ 0.1
Proceeds from sales of investment securities 0.0 0.0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]    
Gross realized gains on sales of investment securities 0.0 0.0
Gross realized losses on sales of investment securities 0.0 0.0
Income tax benefit related to net realized loss on sale of investment securities 0.0 0.0
Interest income from taxable and nontaxable investment securities    
Interest income from taxable investment securities 29.2 22.1
Interest income from non-taxable investment securities $ 2.9 $ 1.0