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PENSION AND OTHER POSTRETIREMENT PLANS (Detail Textuals) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost |  |
Investments for long-term growth (as a percent) | 97.00% |
Investments for near-term benefit payments (as a percent) | 3.00% |
Cumulative historical returns for the S&P 500 index (as a percent) | 10.00% |
Cumulative historical returns for the long term corporate bonds (as a percent) | 5.00% |
Pension Benefits |  |
Employee benefits |  |
Accumulated benefit obligation | $ 23,100 | $ 19,400
Amortization from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year |  |
Estimated net loss | 330 |
Estimated prior service credit | 77 |
SERP Benefits |  |
Employee benefits |  |
Accumulated benefit obligation | 2,500 | $ 2,200
Amortization from accumulated other comprehensive income into net periodic benefit cost over the next fiscal year |  |
Estimated net loss | 121 |
Estimated transition obligation | $ 5 |

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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