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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The net periodic benefit cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
| Three months ended March 31
| 2017 |  | 2016
| (in thousands)
Service cost (1) | $ | — |  |  | $ | 150 |
Interest cost | 830 |  |  | 881 |
Expected return on plan assets | (451 | ) |  | (726 | )
Net amortization and deferral | 663 |  |  | 782 |
Net periodic benefit cost | $ | 1,042 |  |  | $ | 1,087 |
(1) | The Pension Plan was curtailed effective January 1, 2008. Service cost was related to administrative costs associated with the plan and was not due to the accrual of additional participant benefits.
The net periodic benefit of the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
| Three months ended March 31
| 2017 |  | 2016
| (in thousands)
Interest cost | $ | 17 |  |  | $ | 38 |
Net accretion and deferral | (141 | ) |  | (65 | )
Net periodic benefit | $ | (124 | ) |  | $ | (27 | )
The Corporation recognizes the funded status of its Pension Plan and Postretirement Plan on the consolidated balance sheets and recognizes the change in that funded status through other comprehensive income.

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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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