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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2021 and December 31, 2020 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | $ | 2 |  |  | $ | — |  |  | $ | — |  |  | $ | 2 |
Corporate debt securities |  |  | 3,250 |  |  |  | — |  |  |  | 2 |  |  |  | 3,248 |
Total available-for-sale debt securities |  |  | 3,252 |  |  |  | — |  |  |  | 2 |  |  |  | 3,250 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 16,980 |  |  | $ | 46 |  |  | $ | 420 |  |  | $ | 16,606 |
Mortgage-backed U.S. government agencies |  |  | 35,727 |  |  |  | 866 |  |  |  | 3 |  |  |  | 36,590 |
State and political subdivision obligations |  |  | 65,335 |  |  |  | 2,455 |  |  |  | 53 |  |  |  | 67,737 |
Corporate debt securities |  |  | 12,518 |  |  |  | 151 |  |  |  | 83 |  |  |  | 12,586 |
Total held-to-maturity debt securities |  |  | 130,560 |  |  |  | 3,518 |  |  |  | 559 |  |  |  | 133,519 |
Total |  | $ | 133,812 |  |  | $ | 3,518 |  |  | $ | 561 |  |  | $ | 136,769 |
(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 March 31, 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 |
March 31, 2021 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate debt securities |  | 1 |  | $ | 998 |  |  | $ | 2 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 1 |  | $ | 998 |  |  | $ | 2 |
Total temporarily impaired available-for-sale debt securities |  | 1 |  | $ | 998 |  |  | $ | 2 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 1 |  | $ | 998 |  |  | $ | 2 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 7 |  | $ | 11,570 |  |  | $ | 420 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 7 |  | $ | 11,570 |  |  | $ | 420 |
Mortgage-backed U.S. government agencies |  | 3 |  |  | 1,835 |  |  |  | 3 |  |  | 0 |  |  | — |  |  |  | — |  |  | 3 |  |  | 1,835 |  |  |  | 3 |
State and political subdivision obligations |  | 13 |  |  | 6,152 |  |  |  | 53 |  |  | 0 |  |  | — |  |  |  | — |  |  | 13 |  |  | 6,152 |  |  |  | 53 |
Corporate debt securities |  | 4 |  |  | 4,916 |  |  |  | 83 |  |  | 0 |  |  | — |  |  |  | — |  |  | 4 |  |  | 4,916 |  |  |  | 83 |
Total temporarily impaired held-to-maturity debt securities |  | 27 |  | $ | 24,473 |  |  | $ | 559 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 27 |  | $ | 24,473 |  |  | $ | 559 |
Total |  | 28 |  | $ | 25,471 |  |  | $ | 561 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 28 |  | $ | 25,471 |  |  | $ | 561 |
(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 months ended March 31, 2021 and 2020 are shown in the table below. No sales of available-for-sale securities were executed during the three months ended March 31, 2021.
(Dollars in thousands) | Three Months Ended March 31, |
| 2021 |  |  | 2020 |
Realized gains |  | $ | — |  |  |  | $ | 137 |
Realized losses |  |  | — |  |  |  |  | (5 | )
Net gains |  | $ | — |  |  |  | $ | 132 |
Investments Classified by Contractual Maturity Date | The table below illustrates the maturity distribution of investment securities at amortized cost and fair value as of March 31, 2021.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
March 31, 2021 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | — |  |  | $ | — |  |  | $ | 3,465 |  |  | $ | 3,511 |
Due after 1 year but within 5 years |  |  | 2,250 |  |  |  | 2,250 |  |  |  | 38,808 |  |  |  | 40,397 |
Due after 5 years but within 10 years |  |  | 1,000 |  |  |  | 998 |  |  |  | 52,560 |  |  |  | 53,021 |
Due after 10 years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 3,250 |  |  |  | 3,248 |  |  |  | 94,833 |  |  |  | 96,929 |
Mortgage-backed securities |  |  | 2 |  |  |  | 2 |  |  |  | 35,727 |  |  |  | 36,590 |
|  | $ | 3,252 |  |  | $ | 3,250 |  |  | $ | 130,560 |  |  | $ | 133,519 |

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