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BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2018
BENEFIT PLANS [Abstract] |
BENEFIT PLANS |
NOTE H: | BENEFIT PLANS
The Company provides a qualified defined benefit pension to eligible employees and retirees, other post-retirement health and life insurance benefits to certain retirees, an unfunded supplemental pension plan for certain key executives, and an unfunded stock balance plan for certain of its nonemployee directors. The Company accrues for the estimated cost of these benefits through charges to expense during the years that employees earn these benefits. Effective May 12, 2017, the Merchants Bank Pension Plan was merged into the Community Bank System, Inc. Pension Plan and the combined plan was revalued resulting in an additional unamortized actuarial gain of approximately $1.9 million, due primarily to a gain on plan assets that was partially offset by a decrease in the discount rate from 4.50% to 4.40% as of the valuation date. The net periodic benefit cost for the three and six months ended June 30, 2018 and 2017 is as follows:
|  | Pension Benefits |  |  | Post-retirement Benefits |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |  |  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
(000’s omitted) |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost |  | $ | 1,121 |  |  | $ | 1,067 |  |  | $ | 2,242 |  |  | $ | 2,106 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |
Interest cost |  |  | 1,415 |  |  |  | 1,449 |  |  |  | 2,829 |  |  |  | 2,812 |  |  |  | 17 |  |  |  | 19 |  |  |  | 34 |  |  |  | 38 |
Expected return on plan assets |  |  | (3,705 | ) |  |  | (3,407 | ) |  |  | (7,410 | ) |  |  | (6,529 | ) |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Amortization of unrecognized net loss |  |  | 298 |  |  |  | 209 |  |  |  | 596 |  |  |  | 472 |  |  |  | 5 |  |  |  | 2 |  |  |  | 10 |  |  |  | 4 |
Amortization of prior service cost |  |  | (83 | ) |  |  | 17 |  |  |  | (165 | ) |  |  | 30 |  |  |  | (44 | ) |  |  | (45 | ) |  |  | (89 | ) |  |  | (89 | )
Net periodic benefit cost (income) |  | $ | (954 | ) |  | $ | (665 | ) |  | $ | (1,908 | ) |  | $ | (1,109 | ) |  | $ | (22 | ) |  | $ | (24 | ) |  | $ | (45 | ) |  | $ | (47 | )

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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