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Pension and postretirement benefits | 6 Months Ended
--- | ---
Jun. 30, 2021
Employee benefits |
Pension and postretirement benefits | Note 28 – Pension and postretirement benefits The Corporation has a non-contributory defined benefit pension plan and supplementary pension benefit restoration plans for regular employees of certain of its subsidiaries (the “Pension Plans”). The accrual of benefits under the Pension Plans is frozen to all participants. The Corporation also provides certain postretirement health care benefits for retired employees of certain subsidiaries (the “OPEB Plan”). The components of net periodic cost for the Pension Plans and the OPEB Plan for the periods presented were as follows:
|  | Pension Plans |  | OPEB Plan
|  | Quarters ended June 30, |  | Quarters ended June 30,
(In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Personnel Cost: |  |  |  |  |  |  |  |
Service cost | $ | - | $ | - | $ | 160 | $ | 178
Other operating expenses: |  |  |  |  |  |  |  |
Interest cost |  | 3,998 |  | 5,847 |  | 893 |  | 1,228
Expected return on plan assets |  | (9,670) |  | (9,526) |  | - |  | -
Amortization of prior service cost/(credit) |  | - |  | - |  | - |  | -
Amortization of net loss |  | 4,720 |  | 5,220 |  | 469 |  | 142
Total net periodic pension cost | $ | (952) | $ | 1,541 | $ | 1,522 | $ | 1,548
|  | Pension Plans |  | OPEB Plan
|  | Six months ended June 30, |  | Six months ended June 30,
(In thousands) |  | 2021 |  | 2020 |  | 2021 |  | 2020
Personnel Cost: |  |  |  |  |  |  |  |
Service cost | $ | - | $ | - | $ | 320 | $ | 356
Other operating expenses: |  |  |  |  |  |  |  |
Interest cost |  | 7,996 |  | 11,694 |  | 1,785 |  | 2,456
Expected return on plan assets |  | (19,341) |  | (19,052) |  | - |  | -
Amortization prior service cost/(credit) |  | - |  | - |  | - |  | -
Amortization of net loss |  | 9,440 |  | 10,440 |  | 939 |  | 284
Total net periodic pension cost | $ | (1,905) | $ | 3,082 | $ | 3,044 | $ | 3,096
The Corporation paid the following contributions to the plans for the six months ended June 30, 2021 and expects to pay the following contributions for the year ending December 31, 2021.
| For the six months ended | For the year ending
(In thousands) | June 30, 2021 | December 31, 2021
Pension Plans | $ | 114 | $ | 229
OPEB Plan | $ | 3,030 | $ | 6,333

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