Retirement Plans (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Plan [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, 2018 and 2017.

				Select
	Employees'			Executive		Postretirement
	Pension			Retirement		Benefit
	Plan			Plan		Plans
Net Periodic Benefit Cost
For the Three Months Ended March 31, 2018:
Service Cost 1	$	348		$	11	$	33
Interest Cost 2	525			50		99
Expected Return on Plan Assets 2	(785		)	—		—
Amortization of Prior Service (Credit) Cost 2	(12		)	14		(3		)
Amortization of Net Loss 2	33			33		(6		)
Net Periodic Benefit Cost	$	109		$	108	$	123
Plan Contributions During the Period	$	—		$	116	$	17
For the Three Months Ended March 31, 2017:
Service Cost 1	$	350		$	10	$	37
Interest Cost 2	350			50		86
Expected Return on Plan Assets 2	(800		)	—		—
Amortization of Prior Service (Credit) Cost 2	(14		)	14		(3		)
Amortization of Net Loss 2	148			30		—
Net Periodic Benefit Cost	$	34		$	104	$	120
Plan Contributions During the Period	$	—		$	113	$	53

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