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Employee benefit plans (Tables)

12 Months Ended

Dec. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Summary of Pension and Postretirement Life Insurance Plans

		Pension Benefits
December 31		2015			2014
Change in benefit obligation:
Benefit obligation, beginning		$	17,869		$	14,211
Interest cost			696			678
Change in experience loss (gain)			(41)			(250)
Change in assumptions loss (gain)			(367)			3,944
Benefits paid			(777)			(714)
Benefit obligation, ending			17,380			17,869
Change in plan assets:
Fair value of plan assets, beginning			12,839			12,417
Actual return on plan assets			29			895
Employer contributions			240			241
Benefits paid			(777)			(714)
Fair value of plan assets, ending			12,331			12,839
Funded status at end of year		$	(5,049)		$	(5,030)

Schedule of Amounts Recognized in Balance Sheet

		Pension Benefits
December 31		2015			2014
Liabilities		$	5,049		$	5,030
Amounts recognized in the accumulated other comprehensive loss consist of:
Net actuarial gain			(7,863)			(7,567)
Deferred taxes			2,752			2,648
Net amount recognized		$	(5,111)		$	(4,919)

Components of Net Periodic Pension Expense (Income) and Other Amounts Recognized in Other Comprehensive Income

		Pension Benefits
Years Ended December 31,		2015			2014			2013
Net periodic pension expense (income):
Interest cost		$	696		$	678		$	646
Expected return on plan assets			(931)			(910)			(825)
Amortization of unrecognized net loss			198			92			180
Net periodic pension expense (income):			(37)			(140)			1
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss):
Net loss (gain)			296			3,684			(2,369)
Deferred tax			(104)			(1,289)			805
Total recognized in other comprehensive income			192			2,395			(1,564)
Total recognized in net period pension cost and other comprehensive income		$	155		$	2,255		$	(1,563)

		Postretirement Life
		Insurance Benefits
Year Ended December 31,		2015				2014					2013
Components of net periodic pension cost:
Service cost		$				$					$		35
Interest cost													111
Amortization of unrecognized net gain													96
Net periodic other benefit cost		$				$							242
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Net loss (gain)													(1,273)
Deferred tax													620
Total recognized in other comprehensive income													(653)
Total recognized in net period pension cost and other comprehensive income		$				$					$		(411)

Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations and Related Expenses

		Pension Benefits
December 31,		2015		2014		2013
Discount rate:
Obligation		4.00	%	4.00	%	5.00	%
Expense		4.00		5.00		4.25
Expected long-term return on plan assets		7.50	%	7.50	%	7.50	%

Schedule of Pension Plan Weighted-Average Asset Allocations

December 31,		2015		2014
Asset Category:
Cash and cash equivalents		5.9	%	2.4	%
Equity securities		57.0		59.3
Corporate bonds		23.0		14.9
U.S. Government securities		14.1		23.4
		100.0	%	100.0	%

Fair Value Measurement of Pension Plan Assets

					Quoted Prices in
					Active Markets			Significant			Significant
					for Identical			Observable			Observable
					Assets			Inputs			Inputs
December 31, 2015		Total			(Level 1)			(Level 2)			(Level 3)
Cash		$	781		$	781					$
Equity securities:
U.S. large cap			6,772			6,772
International			225			225
Fixed income securities:
U.S. Treasuries			760					$	760
U.S. Government agencies			971						971
Corporate bonds			2,822						2,822
Total		$	12,331		$	7,778		$	4,533		$

					Quoted Prices in
					Active Markets			Significant			Significant
					for Identical			Observable			Observable
					Assets			Inputs			Inputs
December 31, 2014		Total			(Level 1)			(Level 2)			(Level 3)
Cash		$	308		$	308					$
Equity securities:
U.S. large cap			7,369			7,369
International			241			241
Fixed income securities:
U.S. Treasuries			1,073					$	1,073
U.S. Government agencies			1,931						1,931
Corporate bonds			1,917						1,917
Total		$	12,839		$	7,918		$	4,921		$

Schedule of Benefit Payments Expected to be Paid

		Pension Benefits
2016		$	791
2017			801
2018			840
2019			836
2020			878
Thereafter		$	4,776

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=58740216&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=58740216&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=58740216&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(4)
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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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