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Retirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The following tables provide the components of net periodic benefit costs for the three- and nine-month periods ended September 30, 2021 and 2020.
|  | Employees' |  | Select Executive |  | Postretirement
|  | Pension |  | Retirement |  | Benefit
|  | Plan |  | Plan |  | Plans
Net Periodic (Benefit) Cost |  |  |  |  |  |
For the Three Months Ended September 30, 2021: |  |  |  |  |  |
Service Cost 1 |  | $ | 484 |  |  | $ | 146 |  |  | $ | 27 |
Interest Cost 2 |  | 340 |  |  | 48 |  |  | 62 |
Expected Return on Plan Assets 2 |  | (945) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 20 |  |  | 12 |  |  | 27 |
Amortization of Net Loss (Gain) 2 |  | — |  |  | 44 |  |  | (22) |
Net Periodic (Benefit) Cost |  | $ | (101) |  |  | $ | 250 |  |  | $ | 94 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 118 |  |  | $ | 32 |
For the Three Months Ended September 30, 2020: |  |  |  |  |  |
Service Cost 1 |  | $ | 416 |  |  | $ | 102 |  |  | $ | 30 |
Interest Cost 2 |  | 387 |  |  | 48 |  |  | 78 |
Expected Return on Plan Assets 2 |  | (902) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 15 |  |  | 11 |  |  | 27 |
Amortization of Net Loss 2 |  | 20 |  |  | 37 |  |  | — |
Net Periodic (Benefit) Cost |  | $ | (64) |  |  | $ | 198 |  |  | $ | 135 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 116 |  |  | $ | 54 |
Net Periodic Benefit Cost |  |  |  |  |  |
For the Nine Months Ended September 30, 2021: |  |  |  |  |  |
Service Cost 1 |  | $ | 1,451 |  |  | $ | 437 |  |  | $ | 82 |
Interest Cost 2 |  | 1,023 |  |  | 143 |  |  | 186 |
Expected Return on Plan Assets 2 |  | (2,835) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 59 |  |  | 36 |  |  | 80 |
Amortization of Net Loss (Gain) 2 |  | — |  |  | 134 |  |  | (66) |
Net Periodic (Benefit) Cost |  | $ | (302) |  |  | $ | 750 |  |  | $ | 282 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 354 |  |  | $ | 87 |
Estimated Future Contributions in the Current Fiscal Year |  | $ | — |  |  | $ | 118 |  |  | $ | 32 |
For the Nine Months Ended September 30, 2020: |  |  |  |  |  |
Service Cost 1 |  | $ | 1,247 |  |  | $ | 306 |  |  | $ | 92 |
Interest Cost 2 |  | 1,159 |  |  | 144 |  |  | 233 |
Expected Return on Plan Assets 2 |  | (2,706) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 |  | 47 |  |  | 32 |  |  | 80 |
Amortization of Net Loss 2 |  | 61 |  |  | 110 |  |  | — |
Net Periodic (Benefit) Cost |  | $ | (192) |  |  | $ | 592 |  |  | $ | 405 |
Plan Contributions During the Period |  | $ | — |  |  | $ | 349 |  |  | $ | 191 |
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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