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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Proceeds from calls and sales of investment securities and other assets |  |  |  |
Proceeds from calls of investment securities | $ 0.2 | $ 0.3 | $ 8.0 | $ 1.5
Proceeds from sales of investment securities | 0.0 | 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 | 33.4 | 33.8 | 100.7 | 94.5
Interest income from non-taxable investment securities | $ 3.3 | $ 3.8 | $ 10.0 | $ 10.1

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- Definition Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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- Definition Amount of realized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
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