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Investment Securities - Pledged (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Investment Securities |  |  |  |  |
Investment securities with carrying value pledged to secure deports or other | $ 381.4 |  | $ 381.4 |  | $ 260.7
Proceeds from sales or calls of investment securities available-for-sale | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |

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