Securities - Narrative (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Schedule of Investments [Line Items]
Debt securities, available-for-sale, accrued interest, after allowance for credit loss	$ 3.7	$ 4.7
Asset Pledged as Collateral | Public Deposit and Repurchase Agreements
Schedule of Investments [Line Items]
Securities held as collateral, at fair value	$ 612.2	$ 629.7