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EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Pension Benefits |  |  |  |
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |  |
Service cost | $ 293 | $ 286 | $ 585 | $ 577
Interest cost | 185 | 201 | 370 | 397
Expected return on plan assets | (520) | (510) | (1,040) | (965)
Amortization of net loss | 112 | 104 | 225 | 203
Amortization of prior service credit | (19) | (19) | (38) | (38)
Amortization of transition obligation |  |  |  |
Net periodic benefit cost | 51 | 62 | 102 | 174
SERP Benefits |  |  |  |
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |  |
Service cost | 52 | 44 | 105 | 88
Interest cost | 26 | 26 | 52 | 52
Expected return on plan assets |  |  |  |
Amortization of net loss | 13 | 7 | 26 | 14
Amortization of prior service credit |  |  |  |
Amortization of transition obligation | 7 | 7 | 14 | 14
Net periodic benefit cost | $ 98 | $ 84 | $ 197 | $ 168

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- Definition Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of 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)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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