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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Proceeds from calls and sales of investment securities |  |  |  |
Proceeds from calls of investment securities | $ 9.2 | $ 0.2 | $ 43.0 | $ 8.0
Proceeds from sales of investment securities | 0.0 | 0.0 | 0.0 | 25.2
Gross realized gains and losses on investment securities |  |  |  |
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 | 26.6 | 33.4 | 84.2 | 100.7
Interest income from non-taxable investment securities | $ 3.2 | $ 3.3 | $ 9.6 | $ 10.0

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