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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The net periodic benefit cost for the Corporation’s Pension Plan consisted of the following components:
| Three months ended September 30 |  | Nine months ended September 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in thousands)
Service cost (1) | $ | 145 |  |  | $ | 92 |  |  | $ | 435 |  |  | $ | 276 |
Interest cost | 851 |  |  | 853 |  |  | 2,553 |  |  | 2,559 |
Expected return on plan assets | (752 | ) |  | (811 | ) |  | (2,256 | ) |  | (2,432 | )
Net amortization and deferral | 782 |  |  | 244 |  |  | 2,346 |  |  | 732 |
Net periodic benefit cost | $ | 1,026 |  |  | $ | 378 |  |  | $ | 3,078 |  |  | $ | 1,135 |
(1) | The Pension Plan service cost recorded for the nine months ended September 30, 2015 and 2014 was related to administrative costs associated with the plan and was not due to the accrual of additional participant benefits.
The net periodic cost (benefit) of the Corporation’s Postretirement Plan consisted of the following components, excluding the $1.5 million plan amendment gain in 2014:
| Three months ended September 30 |  | Nine months ended September 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in thousands)
Service cost (1) | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Interest cost | 52 |  |  | 48 |  |  | 156 |  |  | 157 |
Net accretion and deferral | (65 | ) |  | (84 | ) |  | (195 | ) |  | (263 | )
Net periodic benefit | $ | (13 | ) |  | $ | (36 | ) |  | $ | (39 | ) |  | $ | (91 | )
(1) | As a result of the plan amendment, additional participant benefits are not accrued under the Postretirement Plan after February 1, 2014.

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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=58740216&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=58740216&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=58740216&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=58242635&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=58740216&loc=d3e1928-114920 + Details
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