Summary of Significant Accounting Policies - Allowance for Credit Losses - Securities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Taxable interest income
Accrued interest on held to maturity debt securities	$ 4.2	$ 4.3
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Taxable interest income
Accrued interest on available for sale debt securities	$ 5.2	$ 5.7