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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 2022, and December 31, 2021. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ |  | Amortized |  | Market |  | Amortized |  | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 702 | ​ | $ | 703 | ​ | $ | 219 | ​ | $ | 223
Due from one through five years | ​ |  | 5,224 | ​ |  | 5,257 | ​ |  | 6,503 | ​ |  | 6,805
Due from six through ten years | ​ |  | 2,505 | ​ |  | 2,595 | ​ |  | 2,479 | ​ |  | 2,790
Due from eleven through twenty years | ​ |  | 799 | ​ |  | 761 | ​ |  | 1,014 | ​ |  | 1,102
Total | ​ | $ | 9,230 | ​ | $ | 9,316 | ​ | $ | 10,215 | ​ | $ | 10,920
Schedule of Unrealized gains and losses on marketable securities | The unrealized gains and losses on marketable securities at June 30, 2022, and at December 31, 2021, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022 | ​ | December 31, 2021
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 170 | ​ | $ | (84) | ​ | $ | 705 | ​ | $ | —
​

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- Definition Tabular disclosure of information about investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5B -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269825-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563 + Details
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