Short-Term Borrowings and Long-Term Debt - Long-term Debt (Details) - Subordinated Debt - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term debt total	$ 148.2	$ 148.0
Minimum
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.02%	6.12%
Long-term debt remaining maturities (in years)	11 years 1 month 6 days
Maximum
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	7.57%	6.67%
Long-term debt remaining maturities (in years)	14 years