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Defined Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [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 March 31, |
(Dollars in thousands) | Pension Benefits |  |  | Other Benefits |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Service cost | $ | 9 |  |  | $ | 9 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  | 9 |  |  |  | 11 |  |  |  | 4 |  |  |  | 5 |
Amortization (accretion) of prior service cost |  | 4 |  |  |  | 3 |  |  |  | (5 | ) |  |  | (6 | )
Net periodic benefit cost | $ | 22 |  |  | $ | 23 |  |  | $ | - |  |  | $ | - |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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