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Retirement Benefits | 3 Months Ended
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Mar. 31, 2017
Postemployment Benefits [Abstract] |
Retirement Benefits | Retirement Benefits The components of net periodic benefit expense related to the non-contributory, defined benefit pension plan for the three month periods ended March 31 were as follows:
|  | Three Months Ended March 31,
In thousands |  | 2017 |  | 2016
Service cost |  | $ | 210 |  |  | $ | 199 |
Interest cost |  | 284 |  |  | 284 |
Expected return on plan assets |  | (630 | ) |  | (608 | )
Amortization of net loss |  | 169 |  |  | 171 |
Net Periodic Benefit Expense |  | $ | 33 |  |  | $ | 46 |
The Corporation previously disclosed in its consolidated financial statements for the year ended December 31, 2016, that it had not yet determined the amount the Bank planned on contributing to the defined benefit plan in 2017. As of March 31, 2017, this contribution amount had still not been determined. Effective April 1, 2012, no inactive or former participant in the plan is eligible to again participate in the plan, and no employee hired after March 31, 2012, is eligible to participate in the plan. As of the last annual census, ACNB Bank had a combined 358 active, vested, terminated and retired persons in the plan.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66047640&loc=d3e39622-114963 + Details
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