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Employee Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2021
Employee Retirement Plans |
Schedule of Company's net periodic pension cost | The components of the Company’s pension expense were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended June 30, | ​ | Six Months Ended June 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
​ | ​ | (Dollars in thousands) | ​ | ​ | ​ | ​ | ​ | ​
Service cost | ​ | $ | 102 | ​ | $ | 115 | ​ | $ | 204 | ​ | $ | 230
Interest cost | ​ |  | 371 | ​ |  | 506 | ​ |  | 742 | ​ |  | 1,006
Expected return on plan assets | ​ |  | (720) | ​ |  | (698) | ​ |  | (1,440) | ​ |  | (1,388)
Net amortization and deferral | ​ |  | 247 | ​ | ​ | 196 | ​ |  | 494 | ​ |  | 382
Pension expense | ​ | $ | — | ​ | $ | 119 | ​ | $ | — | ​ | $ | 230

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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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