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Employee benefit plans (Tables)

12 Months Ended

Dec. 31, 2017

Employee benefit plans

Summary of pension and postretirement life insurance plans

		Pension Benefits
December 31		2017			2016
Change in benefit obligation:
Benefit obligation, beginning		$	16,703		$	17,380
Interest cost			650			665
Change in experience gain			(13)			(322)
Change in actuarial assumptions loss (gain)			395			(256)
Benefits paid			(800)			(764)
Benefit obligation, ending			16,935			16,703
Change in plan assets:
Fair value of plan assets, beginning			12,644			12,331
Actual return on plan assets			1,420			1,023
Employer contributions						54
Benefits paid			(800)			(764)
Fair value of plan assets, ending			13,264			12,644
Funded status at end of year		$	(3,671)		$	(4,059)

Schedule of amounts recognized in balance sheet

		Pension Benefits
December 31		2017			2016
Liabilities		$	3,671		$	4,059
Amounts recognized in the accumulated other comprehensive loss consist of:
Net actuarial loss (gain)			(6,628)			(6,946)
Deferred taxes			1,392			2,431
Net amount recognized		$	(5,236)		$	(4,515)

Schedule of components of net periodic benefit cost

		Pension Benefits
Years Ended December 31,		2017			2016			2015
Net periodic pension income:
Interest cost		$	650		$	665		$	696
Expected return on plan assets			(915)			(893)			(931)
Amortization of unrecognized net loss			195			209			198
Net periodic pension income:			(70)			(19)			(37)
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Net loss (gain)			318			917			296
Deferred tax			(67)			(321)			(104)
Total recognized in other comprehensive income			251			596			192
Total recognized in net period pension cost and other comprehensive income		$	181		$	577		$	155

Schedule of weighted-average assumptions used to determine benefit obligations and related expenses

		Pension Benefits
December 31,		2017		2016		2015
Discount rate:
Obligation		4.00	%	4.00	%	4.00	%
Expense		3.75		4.00		4.00
Expected long-term return on plan assets		7.50	%	7.50	%	7.50	%

Schedule of pension plan weighted-average asset allocations

December 31,		2017		2016
Asset Category:
Cash and cash equivalents		4.1	%	4.2	%
Equity securities		57.4		58.0
Corporate bonds		27.6		26.2
U.S. Government securities		10.9		11.6
		100.0	%	100.0	%

Schedule of fair value measurement of pension plan assets

					Quoted Prices in
					Active Markets			Significant			Significant
					for Identical			Observable			Observable
					Assets			Inputs			Inputs
December 31, 2017		Total			(Level 1)			(Level 2)			(Level 3)
Cash		$	539		$	539					$
Equity securities:
U.S. large cap			7,269			7,269
International			350			350
Fixed income securities:
U.S. Treasuries			198					$	198
U.S. Government agencies			1,247						1,247
Corporate bonds			3,661						3,661
Total		$	13,264		$	8,158		$	5,106		$

					Quoted Prices in
					Active Markets			Significant			Significant
					for Identical			Observable			Observable
					Assets			Inputs			Inputs
December 31, 2016		Total			(Level 1)			(Level 2)			(Level 3)
Cash		$	529		$	529					$
Equity securities:
U.S. large cap			7,046			7,046
International			282			282
Fixed income securities:
U.S. Treasuries			498					$	498
U.S. Government agencies			977						977
Corporate bonds			3,312						3,312
Total		$	12,644		$	7,857		$	4,787		$

Schedule of expected benefit payments

		Pension Benefits
2018		$	835
2019			832
2020			846
2021			847
2022			885
Thereafter			4,869

X

- Definition

Tabular disclosure of the change in the benefit obligation, fair value of plan assets, and funded status of pension plans or other employee benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(b)(c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)
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- Definition

Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Tabular disclosure of the effect of fair value measurements using significant unobservable inputs (Level 3) on changes in plan assets of pension plans and/or other employee benefit plans for the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(4)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)
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