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Employee Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2020
Employee Retirement Plans |
Schedule of Company's net periodic pension cost | The components of the Company’s net periodic pension cost were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2020 |  | 2019 |  | 2020 |  | 2019
​ | ​ | (Dollars in thousands)
Service cost | ​ | $ | 115 | ​ | $ | 116 | ​ | $ | 345 | ​ | $ | 347
Interest cost | ​ |  | 502 | ​ |  | 615 | ​ |  | 1,508 | ​ |  | 1,845
Expected return on plan assets | ​ |  | (693) | ​ |  | (625) | ​ |  | (2,081) | ​ |  | (1,876)
Net amortization and deferral | ​ |  | 191 | ​ |  | 156 | ​ |  | 573 | ​ |  | 469
Net periodic pension cost | ​ | $ | 115 | ​ | $ | 262 | ​ | $ | 345 | ​ | $ | 785
​

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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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