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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2020
Securities Financing Transactions Disclosures [Abstract] |
Unrealized Gain (Loss) on Investments | The majority of the investment portfolio is comprised of securities issued by U.S. government agencies and state and political subdivision obligations. The amortized cost, fair value, and unrealized gains and losses on investment securities at December 31, 2020 and December 31, 2019 are as follows:
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
December 31, 2020 |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
Corporate debt securities |  |  | 5,750 |  |  |  | — |  |  |  | 4 |  |  |  | 5,746 |
Total available for sale securities |  |  | 5,752 |  |  |  | — |  |  |  | 4 |  |  |  | 5,748 |
Held to maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 11,511 |  |  |  | 66 |  |  |  | — |  |  |  | 11,577 |
Mortgage-backed U.S. government agencies |  |  | 40,810 |  |  |  | 948 |  |  |  | 15 |  |  |  | 41,743 |
State and political subdivision obligations |  |  | 65,449 |  |  |  | 3,295 |  |  |  | 6 |  |  |  | 68,738 |
Corporate debt securities |  |  | 10,522 |  |  |  | 215 |  |  |  | 1 |  |  |  | 10,736 |
Total held to maturity securities |  |  | 128,292 |  |  |  | 4,524 |  |  |  | 22 |  |  |  | 132,794 |
Total |  | $ | 134,044 |  |  | $ | 4,524 |  |  | $ | 26 |  |  | $ | 138,542 |
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
December 31, 2019 |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies |  | $ | 22,894 |  |  | $ | 6 |  |  | $ | 70 |  |  | $ | 22,830 |
Mortgage-backed U.S. government agencies |  |  | 12,996 |  |  |  | 7 |  |  |  | 113 |  |  |  | 12,890 |
State and political subdivision obligations |  |  | 30 |  |  |  | — |  |  |  | — |  |  |  | 30 |
Corporate debt securities |  |  | 1,250 |  |  |  | 9 |  |  |  | — |  |  |  | 1,259 |
Total available-for-sale debt securities |  |  | 37,170 |  |  |  | 22 |  |  |  | 183 |  |  |  | 37,009 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 50,210 |  |  |  | 46 |  |  |  | 220 |  |  |  | 50,036 |
Mortgage-backed U.S. government agencies |  |  | 42,098 |  |  |  | 95 |  |  |  | 102 |  |  |  | 42,091 |
State and political subdivision obligations |  |  | 44,169 |  |  |  | 1,193 |  |  |  | 13 |  |  |  | 45,349 |
Total held-to-maturity debt securities |  |  | 136,477 |  |  |  | 1,334 |  |  |  | 335 |  |  |  | 137,476 |
Total |  | $ | 173,647 |  |  | $ | 1,356 |  |  | $ | 518 |  |  | $ | 174,485 |
Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position | The following table presents gross unrealized losses and fair value of investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at December 31, 2020 and 2019.
(Dollars in thousands) |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
December 31, 2020 |  | Number of Securities |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  | Fair Value |  |  | Unrealized Losses |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | 2 |  | $ | 3,497 |  |  | $ | 4 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 2 |  | $ | 3,497 |  |  | $ | 4 |
Total temporarily impaired available for sale securities |  | 2 |  |  | 3,497 |  |  |  | 4 |  |  | 0 |  |  | — |  |  |  | — |  |  | 2 |  |  | 3,497 |  |  |  | 4 |
Held to maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | 8 |  | $ | 5,336 |  |  | $ | 15 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 8 |  | $ | 5,336 |  |  | $ | 15 |
State and political subdivision obligations |  | 2 |  |  | 801 |  |  |  | 6 |  |  | 0 |  |  | — |  |  |  | — |  |  | 2 |  |  | 801 |  |  |  | 6 |
Corporate debt securities |  | 1 |  |  | 449 |  |  |  | 1 |  |  | 0 |  |  | — |  |  |  | — |  |  | 1 |  |  | 449 |  |  |  | 1 |
Total temporarily impaired held to maturity securities |  | 11 |  |  | 6,586 |  |  |  | 22 |  |  | 0 |  |  | — |  |  |  | — |  |  | 11 |  |  | 6,586 |  |  |  | 22 |
Total |  | 13 |  | $ | 10,083 |  |  | $ | 26 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 13 |  | $ | 10,083 |  |  | $ | 26 |
(Dollars in thousands) |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
December 31, 2019 |  | Number of Securities |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  | Fair Value |  |  | Unrealized Losses |  |  | Number of Securities |  | Fair Value |  |  | Unrealized Losses |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agencies |  | 4 |  | $ | 4,652 |  |  | $ | 24 |  |  | 7 |  | $ | 11,982 |  |  | $ | 46 |  |  | 11 |  | $ | 16,634 |  |  | $ | 70 |
Mortgage-backed U.S. government agencies |  | 1 |  |  | 1,643 |  |  |  | 4 |  |  | 14 |  |  | 10,603 |  |  |  | 109 |  |  | 15 |  |  | 12,246 |  |  |  | 113 |
Total temporarily impaired available for sale securities |  | 5 |  |  | 6,295 |  |  |  | 28 |  |  | 21 |  |  | 22,585 |  |  |  | 155 |  |  | 26 |  |  | 28,880 |  |  |  | 183 |
Held to maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 18 |  | $ | 29,024 |  |  | $ | 219 |  |  | 1 |  | $ | 2,999 |  |  | $ | 1 |  |  | 19 |  | $ | 32,023 |  |  | $ | 220 |
Mortgage-backed U.S. government agencies |  | 6 |  |  | 8,445 |  |  |  | 35 |  |  | 13 |  |  | 11,050 |  |  |  | 67 |  |  | 19 |  |  | 19,495 |  |  |  | 102 |
State and political subdivision obligations |  | 3 |  |  | 1,383 |  |  |  | 13 |  |  | 0 |  |  | — |  |  |  | — |  |  | 3 |  |  | 1,383 |  |  |  | 13 |
Total temporarily impaired held to maturity securities |  | 27 |  |  | 38,852 |  |  |  | 267 |  |  | 14 |  |  | 14,049 |  |  |  | 68 |  |  | 41 |  |  | 52,901 |  |  |  | 335 |
Total |  | 32 |  | $ | 45,147 |  |  | $ | 295 |  |  | 35 |  | $ | 36,634 |  |  | $ | 223 |  |  | 67 |  | $ | 81,781 |  |  | $ | 518 |
Schedule of Gross Realized Gains (Losses) on Sales of Available-For-Sale Securities | Gross realized gains and losses on sales of available-for-sale securities for the years ended December 31, 2020, 2019, and 2018 are shown in the table below.
(Dollars in thousands) | For the year ended December 31, |
| 2020 |  |  | 2019 |  |  |  | 2018 |
Realized gains | $ | 479 |  |  | $ | 1,951 |  |  | $ | 150 |
Realized losses |  | (12 | ) |  |  | (73 | ) |  |  | (13 | )
Net gains | $ | 467 |  |  | $ | 1,878 |  |  | $ | 137 |
Investments Classified by Contractual Maturity Date | The table below illustrates the maturity distribution of investment securities at amortized cost and fair value at December 31, 2020.
(Dollars in thousands) |  | Available for Sale |  |  | Held to Maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
December 31, 2020 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Due after 1 year but within 5 years |  |  | 4,750 |  |  |  | 4,747 |  |  |  | 33,983 |  |  |  | 35,196 |
Due after 5 years but within 10 years |  |  | 1,000 |  |  |  | 999 |  |  |  | 51,364 |  |  |  | 53,659 |
Due after 10 years |  |  | — |  |  |  | — |  |  | $ | 2,135 |  |  | $ | 2,196 |
|  |  | 5,750 |  |  |  | 5,746 |  |  |  | 87,482 |  |  |  | 91,051 |
Mortgage-backed securities |  |  | 2 |  |  |  | 2 |  |  |  | 40,810 |  |  |  | 41,743 |
|  | $ | 5,752 |  |  | $ | 5,748 |  |  | $ | 128,292 |  |  | $ | 132,794 |

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