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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The net periodic pension cost for the Corporation’s Defined Benefit Pension Plan ("Pension Plan") consisted of the following components:
| Three months ended June 30 |  | Six months ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Interest cost | $ | 696 |  |  | $ | 830 |  |  | 1,527 |  |  | 1,660 |
Expected return on plan assets | (573 | ) |  | (451 | ) |  | (1,024 | ) |  | (902 | )
Net amortization and deferral | 551 |  |  | 663 |  |  | 1,215 |  |  | 1,326 |
Net periodic pension cost | $ | 674 |  |  | $ | 1,042 |  |  | $ | 1,718 |  |  | $ | 2,084 |
The components of the net benefit for the Corporation’s Postretirement Benefits Plan ("Postretirement Plan") consisted of the following components:
| Three months ended June 30 |  | Six months ended June 30
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in thousands)
Interest cost | $ | 12 |  |  | $ | 17 |  |  | $ | 29 |  |  | $ | 34 |
Net accretion and deferral | (139 | ) |  | (141 | ) |  | (280 | ) |  | (282 | )
Net periodic benefit | $ | (127 | ) |  | $ | (124 | ) |  | $ | (251 | ) |  | $ | (248 | )
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 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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