Derivatives - Gross Notional Amount and Estimated Fair Value of Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Estimated fair value, assets		$ 1.7
Reverse Treasury Lock | Not Designated as Hedging Instrument
Derivative [Line Items]
Gross Notional Amount	$ 0.0	100.0
Estimated fair value, assets	0.0	1.7
Estimated fair value, liabilities	0.0	0.0
Interest Swap Lock | Designated as Hedging Instrument
Derivative [Line Items]
Gross Notional Amount	0.0	5.0
Estimated fair value, assets	0.0	0.0
Estimated fair value, liabilities	0.0	0.4
Treasury Futures | Not Designated as Hedging Instrument
Derivative [Line Items]
Gross Notional Amount	149.7	0.0
Estimated fair value, assets	14.7	0.0
Estimated fair value, liabilities	$ 0.0	$ 0.0