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Investment Securities - Narrative (Details) - USD ($) | Mar. 31, 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 | $ 36,800,000 |
Allowance for credit losses, continuous unrealized loss position | 0 |
Asset Pledged as Collateral | Public Funds, Repurchase Agreements, and Potential Borrowings |  |
Investments in an unrealized loss position |  |
Amortized cost | $ 236,300,000 | $ 223,400,000

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