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Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
Investments |
Schedule of Marketable securities | Below is a summary of the amortized cost and estimated market values of the Company's marketable securities as of June 30, 2021, and December 31, 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Market | ​ | Amortized | ​ | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,493 | ​ | $ | 1,505 | ​ | $ | 2,215 | ​ | $ | 2,249
Due from one through five years | ​ |  | 6,666 | ​ |  | 7,003 | ​ |  | 7,420 | ​ |  | 7,830
Due from six through ten years | ​ |  | 2,635 | ​ |  | 3,106 | ​ |  | 3,057 | ​ |  | 3,608
Due from eleven through twenty years | ​ |  | 1,611 | ​ |  | 1,764 | ​ |  | 2,323 | ​ |  | 2,547
Total | ​ | $ | 12,405 | ​ | $ | 13,378 | ​ | $ | 15,015 | ​ | $ | 16,234
Schedule of Unrealized gains and losses | The unrealized gains and losses on marketable securities at June 30, 2021, and at December 31, 2020, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | December 31, 2020
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 973 | ​ | $ | — | ​ | $ | 1,219 | ​ | $ | —
​

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