XML 37 R24.htm IDEA: XBRL DOCUMENT
v3.25.3

Employee Benefit Plans: (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2025
Retirement Benefits [Abstract] |
Schedule of components of net periodic benefit costs, before allocation to the overhead pool, for Registrant's pension plan, postretirement plan, and SERP | The components of net periodic benefit costs for Registrant’s pension plan, postretirement medical benefit plan and SERP for the three and nine months ended September 30, 2025 and 2024 were as follows:
|  | For The Three Months Ended September 30,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 721 |  |  | $ | 792 |  |  | $ | 27 |  |  | $ | 32 |  |  | $ | 181 |  |  | $ | 358 |
Interest cost |  | 2,691 |  |  | 2,580 |  |  | 23 |  |  | 25 |  |  | 485 |  |  | 426 |
Expected return on plan assets |  | (3,181) |  |  | (3,004) |  |  | (161) |  |  | (142) |  |  | — |  |  | — |
Amortization of prior service cost |  | 109 |  |  | 109 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | — |  |  | — |  |  | (291) |  |  | (278) |  |  | — |  |  | (4) |
Net periodic benefits costs under accounting standards |  | $ | 340 |  |  | $ | 477 |  |  | $ | (402) |  |  | $ | (363) |  |  | $ | 666 |  |  | $ | 780 |
|  | For The Nine Months Ended September 30,
|  | Pension Benefits |  | Other Postretirement Benefits |  | SERP
(dollars in thousands) |  | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Components of Net Periodic Benefits Cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2,163 |  |  | $ | 2,492 |  |  | $ | 81 |  |  | $ | 96 |  |  | $ | 542 |  |  | $ | 1,074 |
Interest cost |  | 8,073 |  |  | 7,680 |  |  | 68 |  |  | 74 |  |  | 1,455 |  |  | 1,278 |
Expected return on plan assets |  | (9,543) |  |  | (9,022) |  |  | (483) |  |  | (426) |  |  | — |  |  | — |
Amortization of prior service cost |  | 327 |  |  | 326 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of actuarial (gain) loss |  | — |  |  | — |  |  | (874) |  |  | (834) |  |  | — |  |  | (11) |
Net periodic benefits costs under accounting standards |  | $ | 1,020 |  |  | $ | 1,476 |  |  | $ | (1,208) |  |  | $ | (1,090) |  |  | $ | 1,997 |  |  | $ | 2,341 |

X
- References No definition available. + Details
Name: | us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration