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Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Securities |
Summary of available for sale debt securities | ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. government agencies and corporations | ​ | $ | 48,171 | ​ | $ | 121 | ​ | $ | (10) | ​ | $ | 48,282 | ​
Mortgage-backed securities | ​ |  | 120,664 | ​ |  | 3,165 | ​ |  | (115) | ​ |  | 123,714 | ​
Obligations of states and political subdivisions | ​ |  | 100,405 | ​ |  | 2,436 | ​ |  | (36) | ​ |  | 102,805 | ​
Corporate and other debt securities | ​ | ​ | 11,584 | ​ | ​ | 47 | ​ | ​ | (43) | ​ | ​ | 11,588 | ​
​ | ​ | $ | 280,824 | ​ | $ | 5,769 | ​ | $ | (204) | ​ | $ | 286,389 | ​
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019 |
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value |
U.S. government agencies and corporations | ​ | $ | 21,454 | ​ | $ | 3 | ​ | $ | (17) | ​ | $ | 21,440 | ​
Mortgage-backed securities | ​ |  | 85,649 | ​ |  | 979 | ​ |  | (43) | ​ |  | 86,585 | ​
Obligations of states and political subdivisions | ​ |  | 80,656 | ​ |  | 1,111 | ​ |  | (59) | ​ |  | 81,708 | ​
​ | ​ | $ | 187,759 | ​ | $ | 2,093 | ​ | $ | (119) | ​ | $ | 189,733 | ​
Schedule of amortized cost and estimated fair value of securities, by the earlier of contractual maturity or expected maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 |
​ |  | Amortized |  | ​ |
(Dollars in thousands) | ​ | Cost | ​ | Fair Value |
Due in one year or less | ​ | $ | 74,739 | ​ | $ | 75,015 | ​
Due after one year through five years | ​ |  | 153,514 | ​ |  | 157,622 | ​
Due after five years through ten years | ​ |  | 50,490 | ​ |  | 51,572 | ​
Due after ten years | ​ |  | 2,081 | ​ |  | 2,180 | ​
​ | ​ | $ | 280,824 | ​ | $ | 286,389 | ​
Schedule of gross realized gains and losses and the proceeds | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(Dollars in thousands) |  | 2020 |  | 2019 |  | 2018
Realized gains from sales, maturities and calls of securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Gross realized gains | ​ | $ | 38 | ​ | $ | 10 | ​ | $ | 10
Gross realized losses | ​ |  | — | ​ |  | — | ​ |  | —
Net realized gains | ​ | $ | 38 | ​ | $ | 10 | ​ | $ | 10
Proceeds from sales, maturities, calls and paydowns of securities | ​ | $ | 123,741 | ​ | $ | 75,583 | ​ | $ | 51,067
Schedule of securities in an unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
(Dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss |
U.S. government agencies and corporations | ​ | $ | 12,719 | ​ | $ | 10 | ​ | $ | — | ​ | $ | — | ​ | $ | 12,719 | ​ | $ | 10 | ​
Mortgage-backed securities | ​ |  | 15,691 | ​ | ​ | 115 | ​ |  | — | ​ |  | — | ​ |  | 15,691 | ​ |  | 115 | ​
Obligations of states and political subdivisions | ​ |  | 5,110 | ​ |  | 36 | ​ |  | — | ​ |  | — | ​ |  | 5,110 | ​ |  | 36 | ​
Corporate and other debt securities | ​ | ​ | 4,271 | ​ | ​ | 43 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,271 | ​ | ​ | 43 | ​
Total temporarily impaired securities | ​ | $ | 37,791 | ​ | $ | 204 | ​ | $ | — | ​ | $ | — | ​ | $ | 37,791 | ​ | $ | 204 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total |
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
(Dollars in thousands) | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss | ​ | Value | ​ | Loss |
U.S. government agencies and corporations | ​ | $ | 6,256 | ​ | $ | 11 | ​ | $ | 4,094 | ​ | $ | 6 | ​ | $ | 10,350 | ​ | $ | 17 | ​
Mortgage-backed securities | ​ | ​ | 4,099 | ​ |  | 7 | ​ |  | 10,166 | ​ |  | 36 | ​ |  | 14,265 | ​ |  | 43 | ​
Obligations of states and political subdivisions | ​ |  | 9,187 | ​ |  | 53 | ​ |  | 1,368 | ​ |  | 6 | ​ |  | 10,555 | ​ |  | 59 | ​
Total temporarily impaired securities | ​ | $ | 19,542 | ​ | $ | 71 | ​ | $ | 15,628 | ​ | $ | 48 | ​ | $ | 35,170 | ​ | $ | 119 | ​

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27290-111563 + Details
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