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Employee benefit plans (Tables) | 9 Months Ended
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Sep. 30, 2024
Employee benefit plans |
Schedule of components of net periodic benefit cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | Pension Benefits
Three Months Ended September 30, | ​ | 2024 | ​ | 2023
Net periodic pension benefit: |  | ​ | ​ |  | ​ | ​
Interest cost | ​ | $ | 158 | ​ | $ | 164
Expected return on plan assets | ​ |  | (320) | ​ |  | (293)
Amortization of unrecognized net loss | ​ |  | 49 | ​ |  | 50
Net periodic pension benefit | ​ | $ | (113) | ​ | $ | (79)
​
​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) | ​ | Pension Benefits
Nine Months Ended September 30, | ​ | 2024 | ​ | 2023
Net periodic pension benefit: |  | ​ | ​ |  | ​ | ​
Interest cost | ​ | $ | 475 | ​ | $ | 492
Expected return on plan assets | ​ |  | (961) | ​ |  | (878)
Amortization of unrecognized net loss | ​ |  | 146 | ​ |  | 149
Net periodic pension benefit: | ​ | ​ | (340) | ​ | ​ | (237)
​

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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