EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Defined Benefit Pension Plan [Member]
Components of Net Periodic Benefit Costs:
Service Cost	$ 1,688	$ 1,613	$ 5,064	$ 4,839
Interest Cost	1,437	1,397	4,312	4,191
Expected Return on Plan Assets	(2,006)	(1,934)	(6,019)	(5,802)
Prior Service Cost Amortization	56	69	167	207
Net Gain (Loss) Amortization	953	801	2,859	2,403
Net Periodic Benefit Cost (Income)	$ 2,128	$ 1,946	$ 6,383	$ 5,838
Discount Rate (in percent)	4.21%	4.52%	4.21%	4.52%
Long-Term Rate of Return on Assets (in percent)	7.25%	7.50%	7.25%	7.50%
Supplemental Executive Retirement Plan [Member]
Components of Net Periodic Benefit Costs:
Interest Cost	$ 48	$ 40	$ 143	$ 120
Prior Service Cost Amortization	0	0	0	0
Net Gain (Loss) Amortization	149	190	448	570
Net Periodic Benefit Cost (Income)	$ 197	$ 230	$ 591	$ 690
Discount Rate (in percent)	3.92%	4.13%	3.92%	4.13%

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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- Definition

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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- Definition

Amount of cost recognized for passage of time related to defined benefit plan.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit plan.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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