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v3.25.1

Retirement Benefits | 3 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit cost for the three months ended March 31 were as follows:
|  |  |  |  | 2025 |  | 2024
|  |  |  |  | (Dollars in thousands)
Service cost |  |  |  |  | $ | 1,944 |  |  | $ | 2,165 |
Interest cost |  |  |  |  | 8,119 |  |  | 8,413 |
Expected return on plan assets |  |  |  |  | (10,257) |  |  | (10,771) |
Amortization of prior service cost |  |  |  |  | 8 |  |  | 23 |
Amortization of actuarial losses |  |  |  |  | 1,893 |  |  | 1,852 |
Net periodic benefit cost |  |  |  |  | $ | 1,707 |  |  | $ | 1,682 |
The components of the net periodic other postretirement benefit cost for the three months ended March 31 were as follows:
|  |  |  |  | 2025 |  | 2024
|  |  |  |  | (Dollars in thousands)
Service cost |  |  |  |  | $ | 4 |  |  | $ | 7 |
Interest cost |  |  |  |  | 151 |  |  | 165 |
Amortization of prior service credit |  |  |  |  | (15) |  |  | (5) |
Amortization of actuarial gains |  |  |  |  | (86) |  |  | (84) |
Net periodic benefit cost |  |  |  |  | $ | 54 |  |  | $ | 83 |

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