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Employee Benefit Plans: (Tables)

3 Months Ended

Mar. 31, 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 months ended March 31, 2025 and 2024 were as follows:

						For The Three Months Ended March 31,
						Pension Benefits												Other Postretirement Benefits												SERP
(dollars in thousands)						2025						2024						2025						2024						2025						2024
Components of Net Periodic Benefits Cost:
Service cost						$	774					$	850					$	27					$	32					$	181					$	358
Interest cost						2,706						2,550						24						23						485						426
Expected return on plan assets						(3,183)						(3,009)						(161)						(142)						—						—
Amortization of prior service cost						108						108						—						—						—						—
Amortization of actuarial (gain) loss						—						—						(291)						(263)						—						(4)
Net periodic benefits costs under accounting standards						405						499						(401)						(350)						666						780
Total expense (benefit) recognized, before surcharges and allocation to overhead pool						$	405					$	499					$	(401)					$	(350)					$	666					$	780

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- References

No definition available.

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- 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://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

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