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Retirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2024
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The following tables provide the components of net periodic benefit costs for the three-month and nine-month periods ended September 30, 2024 and 2023:
|  | Employees' |  | Select Executive |  | Postretirement
|  | Pension |  | Retirement |  | Benefit
|  | Plan |  | Plan |  | Plans
Net Periodic Benefit Cost |  |  |  |  |  |
For the Three Months Ended September 30, 2024: |  |  |  |  |  |
Service Cost 1 |  | $ | 423 |  |  | $ | 20 |  |  | $ | 11 |
Interest Cost (Benefit) 2 |  | 562 |  |  | (157) |  |  | 79 |
Expected Return on Plan Assets 2 |  | (928) |  |  | 237 |  |  | — |
Amortization of Prior Service Cost 2 |  | 32 |  |  | 9 |  |  | 26 |
Amortization of Net Gain 2 |  | — |  |  | 6 |  |  | (84) |
Net Periodic Cost |  | $ | 89 |  |  | $ | 115 |  |  | $ | 32 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 127 |  |  | $ | 31 |
For the Three Months Ended September 30, 2023: |  |  |  |  |  |
Service Cost 1 |  | $ | 398 |  |  | $ | 143 |  |  | $ | 14 |
Interest Cost 2 |  | 524 |  |  | 85 |  |  | 82 |
Expected Return on Plan Assets 2 |  | (854) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 16 |  |  | 9 |  |  | 26 |
Amortization of Net Loss (Gain) 2 |  | 30 |  |  | 18 |  |  | (88) |
Net Periodic Cost |  | $ | 114 |  |  | $ | 255 |  |  | $ | 34 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 99 |  |  | $ | 28 |
Net Periodic Benefit Cost |  |  |  |  |  |
For the Nine Months Ended September 30, 2024: |  |  |  |  |  |
Service Cost 1 |  | $ | 1,269 |  |  | $ | 59 |  |  | $ | 34 |
Interest Cost 2 |  | 1,682 |  |  | 3 |  |  | 239 |
Expected Return on Plan Assets 2 |  | (2,783) |  |  | 237 |  |  | — |
Amortization of Prior Service Cost 2 |  | 98 |  |  | 29 |  |  | 77 |
Amortization of Net Loss (Gain) 2 |  | — |  |  | 18 |  |  | (253) |
Net Periodic Cost |  | $ | 266 |  |  | $ | 346 |  |  | $ | 97 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 382 |  |  | $ | 112 |
Estimated Future Contributions in the Current Fiscal Year |  | $ | — |  |  | $ | 127 |  |  | $ | 37 |
For the Nine Months Ended September 30, 2023: |  |  |  |  |  |
Service Cost 1 |  | $ | 1,195 |  |  | $ | 428 |  |  | $ | 42 |
Interest Cost 2 |  | 1,573 |  |  | 244 |  |  | 249 |
Expected Return on Plan Assets 2 |  | (2,562) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 47 |  |  | 29 |  |  | 78 |
Amortization of Net Loss (Gain) 2 |  | 89 |  |  | 55 |  |  | (265) |
Net Periodic Cost |  | $ | 342 |  |  | $ | 756 |  |  | $ | 104 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 325 |  |  | $ | 75 |
Footnotes: 1. Included in Salaries and Employee Benefits on the Consolidated Statements of Income 2. Included in Other Operating Expense on the Consolidated Statements of Income

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