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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Securities Financing Transactions Disclosures [Abstract] |
Unrealized Gain (Loss) on Investments | The amortized cost, fair value, and unrealized gains and losses on investment securities at September 30, 2021 and December 31, 2020 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
Corporate debt securities |  |  | 5,031 |  |  |  | — |  |  |  | 18 |  |  |  | 5,013 |
Total available-for-sale debt securities |  |  | 5,033 |  |  |  | — |  |  |  | 18 |  |  |  | 5,015 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 43,732 |  |  | $ | 24 |  |  | $ | 334 |  |  | $ | 43,422 |
Mortgage-backed U.S. government agencies |  |  | 27,799 |  |  |  | 690 |  |  |  | 3 |  |  |  | 28,486 |
State and political subdivision obligations |  |  | 67,251 |  |  |  | 2,475 |  |  |  | 39 |  |  |  | 69,687 |
Corporate debt securities |  |  | 14,009 |  |  |  | 151 |  |  |  | 75 |  |  |  | 14,085 |
Total held-to-maturity debt securities |  |  | 152,791 |  |  |  | 3,340 |  |  |  | 451 |  |  |  | 155,680 |
Total |  | $ | 157,824 |  |  | $ | 3,340 |  |  | $ | 469 |  |  | $ | 160,695 |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
Corporate debt securities |  |  | 5,750 |  |  |  | — |  |  |  | 4 |  |  |  | 5,746 |
Total available-for-sale debt securities |  |  | 5,752 |  |  |  | — |  |  |  | 4 |  |  |  | 5,748 |
Held-to-maturity debt 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 debt securities |  |  | 128,292 |  |  |  | 4,524 |  |  |  | 22 |  |  |  | 132,794 |
Total |  | $ | 134,044 |  |  | $ | 4,524 |  |  | $ | 26 |  |  | $ | 138,542 |
Schedule of Fair Value and Unrealized Loss on Debt Security Investments in a Continuous Unrealized Loss Position | The following tables present gross unrealized losses and fair value of debt security investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at September 30, 2021 and December 31, 2020.
(Dollars in thousands) |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |
|  | of |  | Fair |  |  | Unrealized |  |  | of |  | Fair |  |  | Unrealized |  |  | of |  | Fair |  |  | Unrealized |
September 30, 2021 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | 3 |  | $ | 2,982 |  |  | $ | 18 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 3 |  | $ | 2,982 |  |  | $ | 18 |
Total temporarily impaired available-for-sale debt securities |  | 3 |  | $ | 2,982 |  |  | $ | 18 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 3 |  | $ | 2,982 |  |  | $ | 18 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 25 |  | $ | 37,598 |  |  | $ | 334 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 25 |  | $ | 37,598 |  |  | $ | 334 |
Mortgage-backed U.S. government agencies |  | 2 |  |  | 566 |  |  |  | 3 |  |  | 0 |  |  | — |  |  |  | — |  |  | 2 |  |  | 566 |  |  |  | 3 |
State and political subdivision obligations |  | 14 |  |  | 3,849 |  |  |  | 32 |  |  | 1 |  |  | 250 |  |  |  | 7 |  |  | 15 |  |  | 4,099 |  |  |  | 39 |
Corporate debt securities |  | 5 |  |  | 5,924 |  |  |  | 75 |  |  | 0 |  |  | — |  |  |  | — |  |  | 5 |  |  | 5,924 |  |  |  | 75 |
Total temporarily impaired held-to-maturity debt securities |  | 46 |  |  | 47,937 |  |  |  | 444 |  |  | 1 |  |  | 250 |  |  |  | 7 |  |  | 47 |  |  | 48,187 |  |  |  | 451 |
Total |  | 49 |  | $ | 50,919 |  |  | $ | 462 |  |  | 1 |  | $ | 250 |  |  | $ | 7 |  |  | 50 |  | $ | 51,169 |  |  | $ | 469 |
(Dollars in thousands) |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |
|  | of |  | Fair |  |  | Unrealized |  |  | of |  | Fair |  | Unrealized |  |  | of |  | Fair |  |  | Unrealized |
December 31, 2020 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  | Losses |  |  | Securities |  | Value |  |  | 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 |
Schedule of Gross Realized Gains (Losses) on Sales of Available-For-Sale Debt Securities | Gross realized gains and losses on sales of available-for-sale debt securities for the three and nine months ended September 30, 2021 and 2020 are shown in the table below.
(Dollars in thousands) | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Realized gains |  | $ | 79 |  |  |  | $ | 150 |  |  |  | $ | 79 |  |  |  | $ | 405 |
Realized losses |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | (12 | )
Net gains |  | $ | 79 |  |  |  | $ | 150 |  |  |  | $ | 79 |  |  |  | $ | 393 |
Investments Classified by Contractual Maturity Date | The table below illustrates the maturity distribution of investment securities at amortized cost and fair value as of September 30, 2021.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
September 30, 2021 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | — |  |  | $ | — |  |  | $ | 3,891 |  |  | $ | 3,920 |
Due after 1 year but within 5 years |  |  | 1,250 |  |  |  | 1,247 |  |  |  | 35,364 |  |  |  | 36,900 |
Due after 5 years but within 10 years |  |  | 3,781 |  |  |  | 3,766 |  |  |  | 85,737 |  |  |  | 86,374 |
Due after 10 years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 5,031 |  |  |  | 5,013 |  |  |  | 124,992 |  |  |  | 127,194 |
Mortgage-backed securities |  |  | 2 |  |  |  | 2 |  |  |  | 27,799 |  |  |  | 28,486 |
|  | $ | 5,033 |  |  | $ | 5,015 |  |  | $ | 152,791 |  |  | $ | 155,680 |

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