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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2017
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The net periodic benefit of the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
| Three months ended September 30 |  | Nine months ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Interest cost | $ | 17 |  |  | $ | 21 |  |  | $ | 51 |  |  | $ | 64 |
Expected return on plan assets | — |  |  | — |  |  | — |  |  | (1 | )
Net accretion and deferral | (141 | ) |  | (138 | ) |  | (423 | ) |  | (413 | )
Net periodic benefit | $ | (124 | ) |  | $ | (117 | ) |  | $ | (372 | ) |  | $ | (350 | )
The net periodic benefit cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
| Three months ended September 30 |  | Nine months ended September 30
| 2017 |  | 2016 |  | 2017 |  | 2016
| (in thousands)
Service cost (1) | $ | — |  |  | $ | 172 |  |  | $ | — |  |  | $ | 516 |
Interest cost | 830 |  |  | 880 |  |  | 2,490 |  |  | 2,640 |
Expected return on plan assets | (451 | ) |  | (580 | ) |  | (1,353 | ) |  | (1,739 | )
Net amortization and deferral | 663 |  |  | 605 |  |  | 1,989 |  |  | 1,815 |
Net periodic benefit cost | $ | 1,042 |  |  | $ | 1,077 |  |  | $ | 3,126 |  |  | $ | 3,232 |
(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.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: 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=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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