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INVESTMENTS | 12 Months Ended
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Dec. 31, 2020
INVESTMENTS |
INVESTMENTS | 4. INVESTMENTS Below is a summary of the amortized cost and estimated market values of the Company’s marketable securities as of December 31, 2020 and 2019. The estimated market values provided are Level 2 valuations as defined by ASC 820.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019
​ | ​ | Amortized | ​ | Market | ​ | Amortized | ​ | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 2,215 | ​ | $ | 2,249 | ​ | $ | 5,904 | ​ | $ | 5,915
Due from one through five years | ​ |  | 7,420 | ​ |  | 7,830 | ​ |  | 8,336 | ​ |  | 8,621
Due from six through ten years | ​ |  | 3,057 | ​ |  | 3,608 | ​ |  | 4,255 | ​ |  | 4,618
Due from eleven through twenty years | ​ |  | 2,323 | ​ |  | 2,547 | ​ |  | 3,223 | ​ |  | 3,430
Total | ​ | $ | 15,015 | ​ | $ | 16,234 | ​ | $ | 21,718 | ​ | $ | 22,584
​ The unrealized gains and losses on marketable securities at December 31, 2020 and 2019 were as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2020 | ​ | 2019
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 1,219 | ​ | $ | — | ​ | $ | 866 | ​ | $ | —
​ At each reporting date, the Company reviews its investments to determine whether a decline in fair value below the amortized cost basis is other-than-temporary. To determine whether a decline in value is other-than-temporary, the Company considers all available evidence, including the issuer’s financial condition, the severity and duration of the decline in fair value, and the Company’s intent and ability to hold the investment for a reasonable period of time sufficient for any forecasted recovery. If a decline in value is deemed other-than-temporary, the Company records a reduction in the carrying value to the estimated fair value. The Company determined that no other-than-temporary impairment exists for the years ended December 31, 2020 and 2019.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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