Employee Benefits Plans (Details) - Funded status - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Change in benefit obligation:
Actuarial (gain) loss	$ (174)	$ 497
Deferred Compensation Plan [Member]
Change in benefit obligation:
Beginning benefit obligation	4,749	5,412
Interest cost	160	182
Actuarial (gain) loss	210	(395)
Employer contributions	450	450
Benefits paid	(450)	(450)
Ending benefit obligation	4,669	4,749
Funded status	(4,669)	(4,749)
Supplemental Employee Retirement Plan [Member]
Change in benefit obligation:
Beginning benefit obligation	1,952	2,129
Interest cost	68	72
Actuarial (gain) loss	14	(93)
Employer contributions	155	156
Benefits paid	(155)	(156)
Ending benefit obligation	1,879	1,952
Funded status	(1,879)	(1,952)
Other Postretirement Benefit Plan [Member]
Change in benefit obligation:
Beginning benefit obligation	827	932
Interest cost	23	26
Plan participants’ contributions	46	50
Actuarial (gain) loss	(51)	(9)
Employer contributions	89	122
Benefits paid	(135)	(172)
Ending benefit obligation	710	827
Funded status	$ (710)	$ (827)

No definition available.

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- Definition

Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Gain or Loss
-URI http://asc.fasb.org/extlink&oid=49168827

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

+ References

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- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 60
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=49170737

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920

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- Definition

Amount of contributions made by the employer to defined benefit plans.

+ References

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- Definition

The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets.

+ References

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

+ References

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

+ References

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