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Investments | 6 Months Ended
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Jun. 30, 2020
Investments |
Investments | 4. Investments As noted in the Company’s Annual Report on Form 10-K for the year ended December 31, 2019, all of the Company’s marketable securities are classified as held-to-maturity securities and reported at amortized cost pursuant to Accounting Standards Codification (“ASC”) 320, Investments – Debt and Equity Securities, as the Company currently has the intent and ability to hold all investments to maturity. Below is a summary of the amortized cost and estimated market values of the Company’s marketable securities as of June 30, 2020, and December 31, 2019. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020 | ​ | December 31, 2019
​ | ​ | Amortized | ​ | Market |  | Amortized | ​ | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 1,212 | ​ | $ | 1,225 | ​ | $ | 5,904 | ​ | $ | 5,915
Due from one through five years | ​ |  | 7,291 | ​ |  | 7,655 | ​ |  | 8,336 | ​ |  | 8,621
Due from six through ten years | ​ |  | 4,672 | ​ |  | 5,183 | ​ |  | 4,255 | ​ |  | 4,618
Due from eleven through twenty years | ​ |  | 2,528 | ​ |  | 2,739 | ​ |  | 3,223 | ​ |  | 3,430
Total | ​ | $ | 15,703 | ​ | $ | 16,802 | ​ | $ | 21,718 | ​ | $ | 22,584
​ The unrealized gains and losses on marketable securities at June 30, 2020, and at December 31, 2019, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2020 | ​ | December 31, 2019
​ | ​ | Unrealized | ​ | Unrealized | ​ | Unrealized | ​ | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 1,099 | ​ | $ | — | ​ | $ | 866 | ​ | $ | –
​ The estimated market values provided are level 2 valuations as defined by ASC 820, Fair Value Measurements and Disclosures (“ASC 820”). The Company reviewed its portfolio of investments as of June 30, 2020, and determined that no other-than-temporary market value impairment exists.

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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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