Retirement Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2023

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, 2023 and 2022:

	Employees'		Select Executive		Postretirement
	Pension		Retirement		Benefit
	Plan		Plan		Plans
Net Periodic Cost
For the Three Months Ended June 30, 2023:
Service Cost 1	$	384	$	122	$	10
Interest Cost 2	519		97		80
Expected Return on Plan Assets 2	(851)		—		—
Amortization of Prior Service Cost 2	15		10		26
Amortization of Net Loss (Gain) 2	23		19		(98)
Net Periodic Cost	$	90	$	248	$	18
Plan Contributions During the Period	$	—	$	110	$	20
For the Three Months Ended June 30, 2022:
Service Cost 1	$	451	$	271	$	18
Interest Cost 2	352		61		60
Expected Return on Plan Assets 2	(1,058)		—		—
Amortization of Prior Service Cost 2	20		11		26
Amortization of Net Loss (Gain) 2	—		67		(46)
Net Periodic (Benefit) Cost	$	(235)	$	410	$	58
Plan Contributions During the Period	$	—	$	115	$	33
Net Periodic Benefit Cost
For the Six Months Ended June 30, 2023:
Service Cost 1	$	797	$	285	$	28
Interest Cost 2	1,049		159		167
Expected Return on Plan Assets 2	(1,708)		—		—
Amortization of Prior Service Cost 2	31		20		52
Amortization of Net Loss (Gain) 2	59		37		(177)
Net Periodic Cost	$	228	$	501	$	70
Plan Contributions During the Period	$	—	$	226	$	47
Estimated Future Contributions in the Current Fiscal Year	$	—	$	226	$	47
For the Six Months Ended June 30, 2022:
Service Cost 1	$	939	$	418	$	45
Interest Cost 2	719		112		124
Expected Return on Plan Assets 2	(2,157)		—		—
Amortization of Prior Service Cost 2	39		22		53
Amortization of Net Loss (Gain) 2	—		106		(78)
Net Periodic (Benefit) Cost	$	(460)	$	658	$	144
Plan Contributions During the Period	$	—	$	231	$	88

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