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Employee Retirement Plans (Tables) | 9 Months Ended
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Sep. 30, 2025
Employee Retirement Plans |
Schedule of company's pension expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
​ | ​ | (Dollars in thousands)
Service cost | ​ | $ | 30 | ​ | $ | 113 | ​ | $ | 147 | ​ | $ | 306
Interest cost | ​ |  | 589 | ​ |  | 639 | ​ |  | 1,858 | ​ |  | 1,913
Expected return on plan assets | ​ |  | (642) | ​ |  | (607) | ​ |  | (1,898) | ​ |  | (1,831)
Net amortization and deferral | ​ |  | 1 | ​ |  | 107 | ​ |  | 111 | ​ |  | 305
Pension expense | ​ | $ | (22) | ​ | $ | 252 | ​ | $ | 218 | ​ | $ | 693

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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/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: 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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