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Investment Securities - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Investments in an unrealized loss position |  |
Amount of pretax loss if securities in an unrealized loss position are sold | $ 26.1 |
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 306.1 | $ 223.4

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