Retirement Plans (Tables)

9 Months Ended

Sep. 30, 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- and nine-month periods ended September 30, 2018 and 2017.

				Select
	Employees'			Executive		Postretirement
	Pension			Retirement		Benefit
	Plan			Plan		Plans
Net Periodic Benefit Cost
For the Three Months Ended September 30, 2018:
Service Cost 1	$	389		$	104	$	34
Interest Cost 2	400			48		81
Expected Return on Plan Assets 2	(841		)	—		—
Amortization of Prior Service (Credit) Cost 2	(12		)	14		25
Amortization of Net Loss 2	48			33		—
Net Periodic (Benefit) Cost	$	(16	)	$	199	$	140
Plan Contributions During the Period	$	—		$	116	$	56
For the Three Months Ended September 30, 2017:
Service Cost 1	$	350		$	10	$	37
Interest Cost 2	362			55		75
Expected Return on Plan Assets 2	(800		)	—		—
Amortization of Prior Service (Credit) Cost 2	(14		)	14		(3		)
Amortization of Net Loss 2	148			31		—
Net Periodic (Benefit) Cost	$	46		$	110	$	109
Plan Contributions During the Period	$	—		$	116	$	65
Net Periodic Benefit Cost
For the Nine Months Ended September 30, 2018:
Service Cost 1	$	1,168		$	311	$	102
Interest Cost 2	1,199			152		248
Expected Return on Plan Assets 2	(2,522		)	—		—
Amortization of Prior Service (Credit) Cost 2	(37		)	43		75
Amortization of Net Loss 2	145			99		—
Net Periodic (Benefit) Cost	$	(47	)	$	605	$	425
Plan Contributions During the Period	$	—		$	349	$	175
Estimated Future Contributions in the Current Fiscal Year	$	—		$	—	$	—

For the Nine Months Ended September 30, 2017:
Service Cost 1	$	1,050		$	30	$	110
Interest Cost 2	1,085			164		224
Expected Return on Plan Assets 2	(2,399		)	—		—
Amortization of Prior Service (Credit) Cost 2	(43		)	43		(8		)
Amortization of Net Loss 2	443			94		—
Net Periodic (Benefit) Cost	$	136		$	331	$	326
Plan Contributions During the Period	$	—		$	345	$	295

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