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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Proceeds from calls and sales of investment securities |  |  |  |
Proceeds from calls of investment securities | $ 23.4 | $ 7.5 | $ 33.8 | $ 7.7
Proceeds from sales of investment securities | 0.0 | 25.2 | 0.0 | 25.2
Gross realized gains and losses on investment securities |  |  |  |
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 | 28.5 | 33.3 | 57.7 | 67.3
Interest income from non-taxable investment securities | $ 3.2 | $ 3.1 | $ 6.4 | $ 6.7

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