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Investments (Tables) | 6 Months Ended
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Jun. 30, 2024
Investments |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024 | ​ | December 31, 2023 | ​
​ |  | Amortized |  | Market |  | Amortized |  | Market |
​ |  | Cost |  | Value |  | Cost |  | Value |
​ | ​ | (Dollars in thousands) | ​
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Current | ​ | $ | — | ​ | $ | — | ​ | $ | 215 | ​ | $ | 215 | ​
Due from one through five years | ​ |  | 3,531 | ​ |  | 3,560 | ​ |  | 3,518 | ​ |  | 3,592 | ​
Due from six through ten years | ​ |  | 2,836 | ​ |  | 2,748 | ​ |  | 2,836 | ​ |  | 2,830 | ​
Total | ​ | $ | 6,367 | ​ | $ | 6,308 | ​ | $ | 6,569 | ​ | $ | 6,637 | ​
Schedule of unrealized gains and losses on marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2024 | ​ | December 31, 2023 | ​
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized |
​ |  | Gains |  | Losses |  | Gains |  | Losses |
​ | ​ | (Dollars in thousands) | ​
Marketable securities | ​ | $ | 82 | ​ | $ | (141) | ​ | $ | 118 | ​ | $ | (50) | ​

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