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Derivative Instruments and Hedging Activities (Tables) | 9 Months Ended
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Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location | The following table presents the derivative instruments, primary underlying risk exposure, gross notional amount, and fair value of the Company’s derivatives:
|  |  |  | September 30, 2023 |  | December 31, 2022
(Dollars in Millions) |  |  |  | Fair Value |  |  |  | Fair Value
Derivative Instrument |  | Primary Underlying Risk Exposure |  | Gross Notional Amount |  | Assets |  | Liabilities |  | Gross Notional Amount |  | Assets |  | Liabilities
Derivatives Designated as Hedging Instruments:
Interest Swap Lock |  | Interest Rate Risk |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | — |  |  | $ | 0.4 |
Derivatives Not Designated or Not Qualifying as Hedging Instruments:
Treasury Futures |  | Interest Rate Risk |  | $ | 202.5 |  |  | $ | — |  |  | $ | 15.6 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Reverse Treasury Lock |  | Interest Rate Risk |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 100.0 |  |  | $ | 1.7 |  |  | $ | — |

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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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