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Employee Benefit Plans: (Tables)

3 Months Ended

Mar. 31, 2017

Compensation and Retirement Disclosure [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, before allocation to the overhead pool, for Registrant’s pension plan, postretirement plan and Supplemental Executive Retirement Plan ("SERP") for the three months ended March 31, 2017 and 2016 are as follows:

		For The Three Months Ended March 31,
		Pension Benefits								Other Postretirement Benefits								SERP
(dollars in thousands)		2017				2016				2017				2016				2017				2016
Components of Net Periodic Benefits Cost:
Service cost		$	1,251			$	1,232			$	59			$	68			$	232			$	200
Interest cost		1,967				1,930				85				97				223				186
Expected return on plan assets		(2,610		)		(2,460		)		(122		)		(122		)		—				—
Amortization of prior service cost (benefit)		—				12				—				(9		)		3				6
Amortization of actuarial (gain) loss		209				127				(170		)		(150		)		194				73
Net periodic pension cost under accounting standards		817				841				(148		)		(116		)		652				465
Regulatory adjustment — deferred		433				359				—				—				—				—
Total expense recognized, before allocation to overhead pool		$	1,250			$	1,200			$	(148	)		$	(116	)		$	652			$	465

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

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