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Retirement Benefits | 9 Months Ended
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Sep. 30, 2025
Retirement Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of the net periodic pension benefit cost were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2025 |  | Sept. 30, 2024 |  | Sept. 30, 2025 |  | Sept. 30, 2024
| (Dollars in thousands)
Service cost | $ | 1,686 |  |  | $ | 1,990 |  |  | $ | 5,598 |  |  | $ | 6,319 |
Interest cost | 8,104 |  |  | 8,592 |  |  | 24,400 |  |  | 25,413 |
Expected return on plan assets | (10,273) |  |  | (10,772) |  |  | (30,786) |  |  | (32,314) |
Amortization of prior service cost | 46 |  |  | 22 |  |  | 59 |  |  | 68 |
Amortization of actuarial losses | 1,726 |  |  | 2,232 |  |  | 5,502 |  |  | 5,937 |
Net periodic benefit cost | $ | 1,289 |  |  | $ | 2,064 |  |  | $ | 4,773 |  |  | $ | 5,423 |
The components of the net periodic other postretirement benefit (credit) cost were as follows:
| Three Months Ended |  | Nine Months Ended
| Sept. 30, 2025 |  | Sept. 30, 2024 |  | Sept. 30, 2025 |  | Sept. 30, 2024
| (Dollars in thousands)
Service cost | $ | — |  |  | $ | 8 |  |  | $ | 10 |  |  | $ | 22 |
Interest cost | 20 |  |  | 151 |  |  | 322 |  |  | 483 |
Amortization of prior service credit | (16) |  |  | (5) |  |  | (45) |  |  | (15) |
Amortization of actuarial gains | (414) |  |  | (102) |  |  | (586) |  |  | (270) |
Net periodic benefit (credit) cost | $ | (410) |  |  | $ | 52 |  |  | $ | (299) |  |  | $ | 220 |

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