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INVESTMENTS (Tables) | 12 Months Ended
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Dec. 31, 2022
INVESTMENTS |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Marketable securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,385 | ​ | $ | 1,381 | ​ | $ | 219 | ​ | $ | 223
Due from one through five years | ​ |  | 3,977 | ​ |  | 3,950 | ​ |  | 6,503 | ​ |  | 6,805
Due from six through ten years | ​ |  | 2,347 | ​ |  | 2,455 | ​ |  | 2,479 | ​ |  | 2,790
Due from eleven through twenty years | ​ |  | 799 | ​ |  | 773 | ​ |  | 1,014 | ​ |  | 1,102
Total | ​ | $ | 8,508 | ​ | $ | 8,559 | ​ | $ | 10,215 | ​ | $ | 10,920
​
Schedule of unrealized gains on marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 2021
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Marketable securities | ​ | $ | 145 | ​ | $ | (94) | ​ | $ | 705 | ​ | $ | —
​

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