Postretirement Benefits (Tables)

12 Months Ended

Dec. 31, 2017

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block]

Included in accumulated other comprehensive income at December 31, 2017, 2016 and 2015 are the following amounts that have not yet been recognized in net periodic benefit cost:

	December 31
	2017		2016		2015
	(In Thousands)
Unrecognized prior service cost	$	39	$	52	$	53
Unrecognized actuarial losses		551		392		593
Total loss recognized in Accumulated Other Comprehensive Income		590		444		646
Income tax effect		(206)		(155)		(226)
Net loss recognized in Accumulated Other Comprehensive Income	$	384	$	289	$	420

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]

The plan is not currently funded. The following table summarizes benefit obligation and plan asset activity for the plan measured as of December 31 each year:

	December 31
	2017		2016
	(In Thousands)
Change in benefit obligation:
Benefit obligation at beginning of year	$	2,985	$	3,115
Service cost		58		53
Interest cost		117		128
Participant contribution		29		29
Plan amendments for acquisitions		-		12
Actuarial (gains) / losses		166		(184)
Benefits paid		(161)		(168)
Benefit obligation at end of year		3,194		2,985
Change in fair value of plan assets:
Balance at beginning of year		-		-
Employer contribution		132		139
Participant contribution		29		29
Benefits paid		(161)		(168)
Balance at end of year		-		-
Funded status at end of year	$	(3,194)	$	(2,985)

Schedule of Net Benefit Costs [Table Text Block]

Net periodic postretirement benefit cost includes the following components:

	Years Ended December 31
	2017		2016		2015
	(In Thousands)
Service cost-benefits attributable to service during the period	$	58	$	53	$	65
Interest cost on accumulated postretirement benefit obligation		117		128		130
Net amortization and deferral		19		30		47
Net periodic postretirement benefit cost		194		211		242
Net (gain) / loss during the year		166		(184)		(204)
Plan amendment for acquisition		-		12		-
Amortization of prior service cost and actuarial losses		(19)		(30)		(47)
Total recognized in comprehensive income		147		(202)		(251)
Total recognized in net periodic postretirement benefit cost and other comprehensive income	$	341	$	9	$	(9)

Assumptions Are Used In Determining Components Of Postretirement Benefit Obligation [Table Text Block]

The following assumptions were used in determining the components of the postretirement benefit obligation:

	2017			2016			2015
Weighted average discount rates:
Used to determine benefit obligations at December 31		3.50	%		4.00	%		4.25	%
Used to determine net periodic postretirement benefit cost for years ended December 31		4.00	%		4.25	%		4.25	%
Assumed health care cost trend rates at December 31:
Health care cost trend rate assumed for next year		7.00	%		7.50	%		6.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)		5.00	%		5.00	%		5.00	%
Year that rate reaches ultimate trend rate		2022			2022			2019

Schedule of Expected Benefit Payments [Table Text Block]

The following benefits are expected to be paid over the next five years and in aggregate for the next five years thereafter. Because the plan is unfunded, the expected net benefits to be paid and the estimated Company contributions are the same amount.

	Expected to be Paid
	(In Thousands)
2018	$	174
2019		181
2020		194
2021		210
2022		191
2023 through 2027		1,073

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]

Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effect:

	One-Percentage-Point Increase				One-Percentage-Point Decrease
	Year Ended December 31				Year Ended December 31
	2017		2016		2017		2016
	(In Thousands)
Effect on total of service and interest cost	$	25	$	27	$	(21)	$	(22)
Effect on postretirement benefit obligation		392		369		(333)		(314)