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Defined Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Defined Benefit Plans And Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Net Periodic Benefit Costs | The components of net periodic benefit costs from these defined benefit plans are as follows:
| Three Months Ended June 30, |
(Dollars in thousands) | Pension Benefits |  |  | Other Benefits |
| 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost | $ | 33 |  |  | $ | 45 |  |  | $ | — |  |  | $ | 1 |
Interest cost |  | 40 |  |  |  | 60 |  |  |  | 2 |  |  |  | 6 |
Expected return on plan assets |  | (57 | ) |  |  | (68 | ) |  |  | — |  |  |  | — |
Accretion of prior service cost |  | — |  |  |  | — |  |  |  | (5 | ) |  |  | (5 | )
Amortization of net loss |  | — |  |  |  | — |  |  |  | 4 |  |  |  | — |
Settlement loss |  | — |  |  |  | 22 |  |  |  | — |  |  |  | — |
Net periodic benefit expense | $ | 16 |  |  | $ | 59 |  |  | $ | 1 |  |  | $ | 2 |
| Six Months Ended June 30, |
(Dollars in thousands) | Pension Benefits |  |  | Other Benefits |
| 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Service cost | $ | 65 |  |  | $ | 64 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  | 80 |  |  |  | 105 |  |  |  | 4 |  |  |  | 6 |
Expected return on plan assets |  | (113 | ) |  |  | (136 | ) |  |  | — |  |  |  | — |
Accretion of prior service cost |  | — |  |  |  | — |  |  |  | (10 | ) |  |  | (10 | )
Amortization of net loss |  | — |  |  |  | — |  |  |  | 4 |  |  |  | — |
Settlement (gain) loss |  | (49 | ) |  |  | 22 |  |  |  | — |  |  |  | — |
Net periodic benefit (income) expense | $ | (17 | ) |  | $ | 55 |  |  | $ | (1 | ) |  | $ | (3 | )

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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=118255775&loc=d3e1928-114920 + Details
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