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Retirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 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 six-month periods ended June 30, 2024 and 2023:
|  | Employees' |  | Select Executive |  | Postretirement
|  | Pension |  | Retirement |  | Benefit
|  | Plan |  | Plan |  | Plans
Net Periodic Benefit Cost |  |  |  |  |  |
For the Three Months Ended June 30, 2024: |  |  |  |  |  |
Service Cost 1 |  | $ | 380 |  |  | $ | 22 |  |  | $ | 8 |
Interest Cost 2 |  | 595 |  |  | 2 |  |  | 79 |
Expected Return on Plan Assets 2 |  | (923) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 33 |  |  | 10 |  |  | 25 |
Amortization of Net Gain 2 |  | — |  |  | (9) |  |  | (82) |
Net Periodic Cost |  | $ | 85 |  |  | $ | 25 |  |  | $ | 30 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 128 |  |  | $ | 54 |
For the Three Months Ended June 30, 2023: |  |  |  |  |  |
Service Cost 1 |  | $ | 384 |  |  | $ | 122 |  |  | $ | 10 |
Interest Cost 2 |  | 519 |  |  | 97 |  |  | 80 |
Expected Return on Plan Assets 2 |  | (851) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 15 |  |  | 10 |  |  | 26 |
Amortization of Net Loss (Gain) 2 |  | 23 |  |  | 19 |  |  | (98) |
Net Periodic Cost |  | $ | 90 |  |  | $ | 248 |  |  | $ | 18 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 110 |  |  | $ | 20 |
Net Periodic Benefit Cost |  |  |  |  |  |
For the Six Months Ended June 30, 2024: |  |  |  |  |  |
Service Cost 1 |  | $ | 846 |  |  | $ | 39 |  |  | $ | 23 |
Interest Cost 2 |  | 1,120 |  |  | 160 |  |  | 160 |
Expected Return on Plan Assets 2 |  | (1,855) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 66 |  |  | 20 |  |  | 51 |
Amortization of Net Loss (Gain) 2 |  | — |  |  | 12 |  |  | (169) |
Net Periodic Cost |  | $ | 177 |  |  | $ | 231 |  |  | $ | 65 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 255 |  |  | $ | 81 |
Estimated Future Contributions in the Current Fiscal Year |  | $ | — |  |  | $ | 255 |  |  | $ | 81 |
For the Six Months Ended June 30, 2023: |  |  |  |  |  |
Service Cost 1 |  | $ | 797 |  |  | $ | 285 |  |  | $ | 28 |
Interest Cost 2 |  | 1,049 |  |  | 159 |  |  | 167 |
Expected Return on Plan Assets 2 |  | (1,708) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 31 |  |  | 20 |  |  | 52 |
Amortization of Net Loss (Gain) 2 |  | 59 |  |  | 37 |  |  | (177) |
Net Periodic Cost |  | $ | 228 |  |  | $ | 501 |  |  | $ | 70 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 226 |  |  | $ | 47 |
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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