XML 35 R23.htm IDEA: XBRL DOCUMENT
v3.21.2

Investments (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
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, 2021, and December 31, 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
​ | ​ | Amortized | ​ | Market | ​ | Amortized | ​ | Market
​ |  | Cost |  | Value |  | Cost |  | Value
​ | ​ | (Dollars in thousands)
Municipal bonds: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Current | ​ | $ | 751 | ​ | $ | 755 | ​ | $ | 2,215 | ​ | $ | 2,249
Due from one through five years | ​ |  | 6,705 | ​ |  | 7,050 | ​ |  | 7,420 | ​ |  | 7,830
Due from six through ten years | ​ |  | 2,734 | ​ |  | 3,188 | ​ |  | 3,057 | ​ |  | 3,608
Due from eleven through twenty years | ​ |  | 1,199 | ​ |  | 1,300 | ​ |  | 2,323 | ​ |  | 2,547
Total | ​ | $ | 11,389 | ​ | $ | 12,293 | ​ | $ | 15,015 | ​ | $ | 16,234
Schedule of Unrealized gains and losses on marketable securities | The unrealized gains and losses on marketable securities at September 30, 2021, and at December 31, 2020, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
​ |  | Unrealized |  | Unrealized |  | Unrealized |  | Unrealized
​ |  | Gains |  | Losses |  | Gains |  | Losses
​ | ​ | (Dollars in thousands)
Municipal bonds | ​ | $ | 904 | ​ | $ | — | ​ | $ | 1,219 | ​ | $ | —
​

X
- 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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=123581744&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 http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of unrealized gains and losses on investments. + References No definition available. + Details
Name: | us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration