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EMPLOYEE BENEFITS (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Pension Benefits |  |  |  |
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |  |
Service cost | $ 293 | $ 288 | $ 878 | $ 865
Interest cost | 185 | 199 | 555 | 596
Expected return on plan assets | (521) | (482) | (1,561) | (1,447)
Amortization of net loss | 113 | 102 | 338 | 305
Amortization of prior service credit | (20) | (20) | (58) | (58)
Amortization of transition obligation | 0 | 0 | 0 | 0
Net periodic benefit cost | 50 | 87 | 152 | 261
SERP Benefits |  |  |  |
Components of net periodic benefit cost and other amounts recognized in Other Comprehensive Income |  |  |  |
Service cost | 54 | 44 | 159 | 132
Interest cost | 26 | 27 | 78 | 79
Expected return on plan assets | 0 | 0 | 0 | 0
Amortization of net loss | 12 | 6 | 38 | 20
Amortization of prior service credit | 0 | 0 | 0 | 0
Amortization of transition obligation | 7 | 7 | 21 | 21
Net periodic benefit cost | $ 99 | $ 84 | $ 296 | $ 252

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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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