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Investment Securities | 3 Months Ended
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Mar. 31, 2021
Investment Securities [Abstract] |
Investment Securities | Note 3 – Investment Securities The following tables provide information on the amortized cost and estimated fair values of debt securities. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 18,583 | ​ | $ | 4 | ​ | $ | 438 | ​ | $ | 18,149
Mortgage-backed | ​ |  | 104,492 | ​ |  | 2,031 | ​ |  | 569 | ​ |  | 105,954
Total | ​ | $ | 123,075 | ​ | $ | 2,035 | ​ | $ | 1,007 | ​ | $ | 124,103
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 23,600 | ​ | $ | 20 | ​ | $ | 83 | ​ | $ | 23,537
Mortgage-backed | ​ |  | 113,865 | ​ |  | 2,234 | ​ |  | 68 | ​ |  | 116,031
Total | ​ | $ | 137,465 | ​ | $ | 2,254 | ​ | $ | 151 | ​ | $ | 139,568
​ No available for sale securities were sold during the three months ended March 31, 2021 and 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | Estimated
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(Dollars in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
Held-to-maturity securities: |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 38,409 | ​ | $ | 12 | ​ | $ | 423 | ​ | $ | 37,998
Mortgage-backed | ​ | ​ | 68,067 | ​ | ​ | 74 | ​ | ​ | 700 | ​ | ​ | 67,441
States and political subdivisions | ​ |  | 400 | ​ |  | 1 | ​ |  | — | ​ |  | 401
Other debt securities | ​ |  | 19,053 | ​ |  | 226 | ​ |  | 43 | ​ |  | 19,236
Total | ​ | $ | 125,929 | ​ | $ | 313 | ​ | $ | 1,166 | ​ | $ | 125,076
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 18,893 | ​ | $ | 38 | ​ | $ | 43 | ​ | $ | 18,888
Mortgage-backed | ​ | ​ | 27,347 | ​ | ​ | 7 | ​ | ​ | 18 | ​ | ​ | 27,336
States and political subdivisions | ​ |  | 400 | ​ |  | 1 | ​ |  | — | ​ |  | 401
Other debt securities | ​ |  | 19,066 | ​ |  | 139 | ​ |  | 2 | ​ |  | 19,203
Total | ​ | $ | 65,706 | ​ | $ | 185 | ​ | $ | 63 | ​ | $ | 65,828
​ Equity securities with an aggregate fair value of $1.4 million at March 31, 2021 and $1.4 million at December 31, 2020 are presented separately on the balance sheet. The fair value adjustment recorded through earnings totaled $(18) thousand for the three months ended March 31, 2021 and $1 thousand for the three months ended March 31, 2020, respectively. ​ The following tables provide information about gross unrealized losses and fair value by length of time that the individual securities have been in a continuous unrealized loss position at March 31, 2021 and December 31, 2020. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than | ​ | More than | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 12 Months | ​ | 12 Months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(Dollars in thousands) | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
March 31, 2021 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 17,564 | ​ | $ | 436 | ​ | $ | 223 | ​ | $ | 2 | ​ | $ | 17,787 | ​ | $ | 438
Mortgage-backed | ​ |  | 49,427 | ​ |  | 569 | ​ |  | — | ​ |  | — | ​ |  | 49,427 | ​ |  | 569
Total | ​ | $ | 66,991 | ​ | $ | 1,005 | ​ | $ | 223 | ​ | $ | 2 | ​ | $ | 67,214 | ​ | $ | 1,007
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 22,082 | ​ | $ | 423 | ​ | $ | — | ​ | $ | — | ​ | $ | 22,082 | ​ | $ | 423
Mortgage-backed | ​ | ​ | 49,863 | ​ | ​ | 700 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 49,863 | ​ | ​ | 700
Other debt securities | ​ | ​ | 4,457 | ​ | ​ | 43 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,457 | ​ | ​ | 43
Total | ​ | $ | 76,402 | ​ | $ | 1,166 | ​ | $ | — | ​ | $ | — | ​ | $ | 76,402 | ​ | $ | 1,166
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than | ​ | More than | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 12 Months | ​ | 12 Months | ​ | Total
​ |  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(Dollars in thousands) | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses
December 31, 2020 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 14,919 | ​ | $ | 82 | ​ | $ | 236 | ​ | $ | 1 | ​ | $ | 15,155 | ​ | $ | 83
Mortgage-backed | ​ |  | 11,869 | ​ |  | 68 | ​ |  | — | ​ |  | — | ​ |  | 11,869 | ​ |  | 68
Total | ​ | $ | 26,788 | ​ | $ | 150 | ​ | $ | 236 | ​ | $ | 1 | ​ | $ | 27,024 | ​ | $ | 151
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Government agencies | ​ | $ | 6,646 | ​ | $ | 43 | ​ | $ | — | ​ | $ | — | ​ | $ | 6,646 | ​ | $ | 43
Mortgage-backed | ​ | ​ | 5,093 | ​ | ​ | 18 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,093 | ​ | ​ | 18
Other debt securities | ​ |  | 498 | ​ |  | 2 | ​ |  | — | ​ |  | — | ​ |  | 498 | ​ |  | 2
Total | ​ | $ | 12,237 | ​ | $ | 63 | ​ | $ | — | ​ | $ | — | ​ | $ | 12,237 | ​ | $ | 63
​ All of the securities with unrealized losses in the portfolio have modest duration risk, low credit risk, and minimal losses when compared to total amortized cost. The unrealized losses on debt securities that exist are the result of market changes in interest rates since original purchase. Because the Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell these securities before recovery of their amortized cost basis, which may be at maturity for debt securities, the Company considers the unrealized losses to be temporary. There were eighteen available-for-sale securities and nineteen held-to-maturity securities in an unrealized loss position at March 31, 2021. The following table provides information on the amortized cost and estimated fair values of investment securities by maturity date at March 31, 2021. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for sale | ​ | Held to maturity
​ |  | Amortized |  | ​ | ​ |  | Amortized |  | ​ | ​
(Dollars in thousands) | ​ | Cost | ​ | Fair Value | ​ | Cost | ​ | Fair Value
Due in one year or less | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ |  | 1,174 | ​ |  | 1,214 | ​ |  | 7,919 | ​ |  | 7,968
Due after five years through ten years | ​ |  | 57,863 | ​ |  | 59,015 | ​ |  | 37,492 | ​ |  | 37,403
Due after ten years | ​ |  | 64,038 | ​ |  | 63,874 | ​ |  | 80,518 | ​ |  | 79,705
Total | ​ | $ | 123,075 | ​ | $ | 124,103 | ​ | $ | 125,929 | ​ | $ | 125,076
​ The maturity dates for debt securities are determined using contractual maturity dates.

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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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