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Securities - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt and Equity Securities, FV-NI [Line Items]      
Realized loss $ 0.0 $ 0.0  
Accrued interest $ 7.0   $ 7.0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest Receivable   Interest Receivable
Private Equity Funds      
Debt and Equity Securities, FV-NI [Line Items]      
Equity securities $ 7.1    
Collateralized Debt Obligations | Asset Pledged as Collateral      
Debt and Equity Securities, FV-NI [Line Items]      
Securities pledged as collateral $ 45.0   $ 40.0