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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2020 and December 31, 2019 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | $ | 3,671 |  |  | $ | 6 |  |  | $ | 15 |  |  | $ | 3,662 |
State and political subdivision obligations |  |  | 16,092 |  |  |  | 27 |  |  |  | 1 |  |  |  | 16,118 |
Corporate debt securities |  |  | 7,633 |  |  |  | 13 |  |  |  | 6 |  |  |  | 7,640 |
Total available-for-sale debt securities |  |  | 27,396 |  |  |  | 46 |  |  |  | 22 |  |  |  | 27,420 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 68,321 |  |  | $ | 288 |  |  | $ | 18 |  |  | $ | 68,591 |
Mortgage-backed U.S. government agencies |  |  | 44,940 |  |  |  | 916 |  |  |  | 24 |  |  |  | 45,832 |
State and political subdivision obligations |  |  | 50,603 |  |  |  | 1,295 |  |  |  | 78 |  |  |  | 51,820 |
Corporate debt securities |  |  | 4,099 |  |  |  | 57 |  |  |  | — |  |  |  | 4,156 |
Total held-to-maturity debt securities |  |  | 167,963 |  |  |  | 2,556 |  |  |  | 120 |  |  |  | 170,399 |
Total |  | $ | 195,359 |  |  | $ | 2,602 |  |  | $ | 142 |  |  | $ | 197,819 |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt 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 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, 2020 and December 31, 2019.
(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, 2020 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed U.S. government agencies |  | 1 |  | $ | 2,573 |  |  | $ | 13 |  |  | 1 |  | $ | 200 |  |  | $ | 2 |  |  | 2 |  | $ | 2,773 |  |  | $ | 15 |
State and political subdivision obligations |  | 1 |  |  | 2,962 |  |  |  | 1 |  |  | 0 |  |  | — |  |  |  | — |  |  | 1 |  |  | 2,962 |  |  |  | 1 |
Corporate debt securities |  | 2 |  |  | 3,893 |  |  |  | 6 |  |  | 0 |  |  | — |  |  |  | — |  |  | 2 |  |  | 3,893 |  |  |  | 6 |
Total temporarily impaired available-for-sale debt securities |  | 4 |  | $ | 9,428 |  |  | $ | 20 |  |  | 1 |  | $ | 200 |  |  | $ | 2 |  |  | 5 |  | $ | 9,628 |  |  | $ | 22 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 4 |  | $ | 5,507 |  |  | $ | 18 |  |  | 0 |  | $ | — |  |  | $ | — |  |  | 4 |  | $ | 5,507 |  |  | $ | 18 |
Mortgage-backed U.S. government agencies |  | 2 |  |  | 1,960 |  |  |  | 18 |  |  | 2 |  |  | 1,358 |  |  |  | 6 |  |  | 4 |  |  | 3,318 |  |  |  | 24 |
State and political subdivision obligations |  | 8 |  |  | 5,332 |  |  |  | 78 |  |  | 0 |  |  | — |  |  |  | — |  |  | 8 |  |  | 5,332 |  |  |  | 78 |
Total temporarily impaired held-to-maturity debt securities |  | 14 |  | $ | 12,799 |  |  | $ | 114 |  |  | 2 |  | $ | 1,358 |  |  | $ | 6 |  |  | 16 |  | $ | 14,157 |  |  | $ | 120 |
Total |  | 18 |  | $ | 22,227 |  |  | $ | 134 |  |  | 3 |  | $ | 1,558 |  |  | $ | 8 |  |  | 21 |  | $ | 23,785 |  |  | $ | 142 |
(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, 2019 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  | Losses |  |  | Securities |  | Value |  |  | 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 Debt Securities | Gross realized gains and losses on sales of available-for-sale debt securities for the three months ended March 31, 2020 and 2019 are shown in the table below.
(Dollars in thousands) | Three Months Ended March 31, |
| 2020 |  |  | 2019 |
Realized gains |  | $ | 137 |  |  |  | $ | 26 |
Realized losses |  |  | (5 | ) |  |  |  | (19 | )
Net gains |  | $ | 132 |  |  |  | $ | 7 |
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, 2020.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
March 31, 2020 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | — |  |  | $ | — |  |  | $ | 5,907 |  |  | $ | 5,953 |
Due after 1 year but within 5 years |  |  | 7,982 |  |  |  | 8,012 |  |  |  | 15,378 |  |  |  | 15,751 |
Due after 5 years but within 10 years |  |  | 7,599 |  |  |  | 7,598 |  |  |  | 96,184 |  |  |  | 97,347 |
Due after 10 years |  |  | 8,144 |  |  |  | 8,148 |  |  |  | 5,554 |  |  |  | 5,516 |
|  |  | 23,725 |  |  |  | 23,758 |  |  |  | 123,023 |  |  |  | 124,567 |
Mortgage-backed securities |  |  | 3,671 |  |  |  | 3,662 |  |  |  | 44,940 |  |  |  | 45,832 |
|  | $ | 27,396 |  |  | $ | 27,420 |  |  | $ | 167,963 |  |  | $ | 170,399 |

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