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v3.21.2

Pension Benefits and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit (Credit) Cost | The components of net periodic benefit (credit) cost were as follows:
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
| June 30, |  | June 30, |  | June 30, |  | June 30,
(Dollars in thousands) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |  |  | $ | 17 |  |  | $ | 30 |  |  | $ | 34 |
Interest cost | 184 |  |  | 231 |  |  | 368 |  |  | 462 |  |  | 6 |  |  | 10 |  |  | 12 |  |  | 20 |
Expected return of plan assets | (390) |  |  | (393) |  |  | (780) |  |  | (786) |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credit | — |  |  | — |  |  | — |  |  | — |  |  | (24) |  |  | (28) |  |  | (48) |  |  | (56) |
Amortization of net loss | 98 |  |  | 114 |  |  | 196 |  |  | 228 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement benefit | — |  |  | (63) |  |  | — |  |  | (63) |  |  | — |  |  | — |  |  | — |  |  | — |
Net periodic benefit (credit) cost | $ | (108) |  |  | $ | (111) |  |  | $ | (216) |  |  | $ | (159) |  |  | $ | (3) |  |  | $ | (1) |  |  | $ | (6) |  |  | $ | (2) |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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