Retirement Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2021

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures

The following tables provide the components of net periodic benefit costs for the three month periods ended March 31, 2021 and 2020.

	Employees'		Select Executive		Postretirement
	Pension		Retirement		Benefit
	Plan		Plan		Plans
Net Periodic (Benefit) Cost
For the Three Months Ended March 31, 2021:
Service Cost 1	$	460	$	118	$	31
Interest Cost 2	340		45		67
Expected Return on Plan Assets 2	(950)		—		—
Amortization of Prior Service Cost 2	20		12		27
Amortization of Net Loss 2	—		38		8
Net Periodic (Benefit) Cost	$	(130)	$	213	$	133
Plan Contributions During the Period	$	—	$	118	$	28

For the Three Months Ended March 31, 2020:
Service Cost 1	$	430	$	103	$	33
Interest Cost 2	417		54		78
Expected Return on Plan Assets 2	(904)		—		—
Amortization of Prior Service Cost 2	16		11		27
Amortization of Net Loss 2	1		33		2
Net Periodic (Benefit) Cost	$	(40)	$	201	$	140
Plan Contributions During the Period	$	—	$	117	$	78

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