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Investments (Tables) | 9 Months Ended
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Sep. 30, 2020
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 September 30, 2020, and December 31, 2019: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019
​ | ​ | Amortized | ​ | Market |  | Amortized | ​ | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,955 | ​ | $ | 1,977 | ​ | $ | 5,904 | ​ | $ | 5,915
Due from one through five years | ​ |  | 7,031 | ​ |  | 7,388 | ​ |  | 8,336 | ​ |  | 8,621
Due from six through ten years | ​ |  | 4,149 | ​ |  | 4,756 | ​ |  | 4,255 | ​ |  | 4,618
Due from eleven through twenty years | ​ |  | 2,523 | ​ |  | 2,741 | ​ |  | 3,223 | ​ |  | 3,430
Total | ​ | $ | 15,658 | ​ | $ | 16,862 | ​ | $ | 21,718 | ​ | $ | 22,584
Schedule of Unrealized gains and losses | The unrealized gains and losses on marketable securities at September 30, 2020, and at December 31, 2019, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020 | ​ | December 31, 2019
​ | ​ | Unrealized | ​ | Unrealized | ​ | Unrealized | ​ | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 1,204 | ​ | $ | — | ​ | $ | 866 | ​ | $ | –
​

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