Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2020

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following tables provide the components of net periodic benefit costs for the three and six month periods ended June 30, 2020 and 2019.

	Employees'		Select Executive		Postretirement
	Pension		Retirement		Benefit
	Plan		Plan		Plans
Net Periodic Benefit Cost
For the Three Months Ended June 30, 2020
Service Cost 1	$	401	$	101	$	29
Interest Cost 2	355		42		77
Expected Return on Plan Assets 2	(900)		—		—
Amortization of Prior Service Cost 2	16		10		26
Amortization of Net Loss (Gain) 2	40		40		(2)
Net Periodic Cost	$	(88)	$	193	$	130
Plan Contributions During the Period	$	—	$	116	$	59
For the Three Months Ended June 30, 2019:
Service Cost 1	$	365	$	65	$	31
Interest Cost 2	343		56		93
Expected Return on Plan Assets 2	(761)		—		—
Amortization of Prior Service Cost 2	18		13		26
Amortization of Net Loss (Gain) 2	154		30		(5)
Net Periodic Cost	$	119	$	164	$	145
Plan Contributions During the Period	$	—	$	117	$	54

Net Periodic Benefit Cost
For the Six Months Ended June 30, 2020:
Service Cost 1	$	831	$	204	$	62
Interest Cost 2	772		96		155
Expected Return on Plan Assets 2	(1,804)		—		—
Amortization of Prior Service Cost 2	32		21		53
Amortization of Net Loss 2	41		73		—
Net Periodic (Benefit) Cost	$	(128)	$	394	$	270
Plan Contributions During the Period	$	—	$	233	$	137
Estimated Future Contributions in the Current Fiscal Year	$	—	$	—	$	—
For the Six Months Ended June 30, 2019:
Service Cost 1	$	764	$	162	$	61
Interest Cost 2	740		108		182
Expected Return on Plan Assets 2	(1,531)		—		—
Amortization of Prior Service Cost 2	35		27		51
Amortization of Net Loss (Benefit) 2	307		57		(22)
Net Periodic Cost	$	315	$	354	$	272
Plan Contributions During the Period	$	—	$	233	$	91

Footnotes:

1. Included in Salaries and Employee Benefits on the Consolidated Statements of Income

2. Included in Other Operating Expense on the Consolidated Statements of Income