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Components of Net Periodic Benefit Cost | 3 Months Ended
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Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost
|  | Three Months Ended March 31,
|  | (000's)
|  | Pension Benefits |  | Post-Retirement Health Benefits
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 470 |  |  | $ | 538 |  |  | $ | 14 |  |  | $ | 16 |
Interest cost |  | 932 |  |  | 879 |  |  | 46 |  |  | 43 |
Expected return on plan assets |  | (857 | ) |  | (863 | ) |  | — |  |  | — |
Amortization of transition obligation |  | — |  |  | — |  |  | — |  |  | — |
Net amortization of prior service cost |  | — |  |  | — |  |  | — |  |  | — |
Net amortization of net (gain) loss |  | 484 |  |  | 1,185 |  |  | — |  |  | — |
Net Periodic Benefit Cost |  | $ | 1,029 |  |  | $ | 1,739 |  |  | $ | 60 |  |  | $ | 59 |
Employer Contributions First Financial Corporation previously disclosed in its financial statements for the year ended December 31, 2015 that it expected to contribute $2.7 million and $1.1 million respectively to its Pension Plan and ESOP and $262 thousand to the Post Retirement Health Benefits Plan in 2016. Contributions of $545 thousand have been made to the Pension Plan thus far in 2016. Contributions of $50 thousand have been made through the first three months of 2016 for the Post Retirement Health Benefits plan. No contributions have been made in 2016 for the ESOP. The Pension plan was frozen for most employees at the end of 2012 and for those employees there will be discretionary contributions to the ESOP plan and a 401K plan in place of the former Pension benefit. In the first three months of 2016 and 2015 there has been $428 thousand and $359 thousand of expense accrued for potential contributions to these alternative retirement benefit options.

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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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