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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2019
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, 2019 and December 31, 2018 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
September 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 32,611 |  |  | $ | 33 |  |  | $ | 111 |  |  | $ | 32,533 |
Mortgage-backed U.S. government agencies |  |  | 16,638 |  |  |  | 8 |  |  |  | 135 |  |  |  | 16,511 |
State and political subdivision obligations |  |  | 1,059 |  |  |  | — |  |  |  | 4 |  |  |  | 1,055 |
Corporate debt securities |  |  | 2,250 |  |  |  | 70 |  |  |  | — |  |  |  | 2,320 |
Total available-for-sale debt securities |  |  | 52,558 |  |  |  | 111 |  |  |  | 250 |  |  |  | 52,419 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 19,421 |  |  |  | 39 |  |  |  | 20 |  |  |  | 19,440 |
Mortgage-backed U.S. government agencies |  |  | 67,472 |  |  |  | 521 |  |  |  | 119 |  |  |  | 67,874 |
State and political subdivision obligations |  |  | 82,051 |  |  |  | 2,820 |  |  |  | — |  |  |  | 84,871 |
Corporate debt securities |  |  | 1,528 |  |  |  | 9 |  |  |  | — |  |  |  | 1,537 |
Total held-to-maturity debt securities |  |  | 170,472 |  |  |  | 3,389 |  |  |  | 139 |  |  |  | 173,722 |
Total |  | $ | 223,030 |  |  | $ | 3,500 |  |  | $ | 389 |  |  | $ | 226,141 |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 43,270 |  |  | $ | 10 |  |  | $ | 1,708 |  |  | $ | 41,572 |
Mortgage-backed U.S. government agencies |  |  | 39,865 |  |  |  | — |  |  |  | 1,016 |  |  |  | 38,849 |
State and political subdivision obligations |  |  | 30,642 |  |  |  | 11 |  |  |  | 1,397 |  |  |  | 29,256 |
Corporate debt securities |  |  | 2,250 |  |  |  | — |  |  |  | 4 |  |  |  | 2,246 |
Total available-for-sale debt securities |  |  | 116,027 |  |  |  | 21 |  |  |  | 4,125 |  |  |  | 111,923 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 16,985 |  |  |  | 14 |  |  |  | 143 |  |  |  | 16,856 |
Mortgage-backed U.S. government agencies |  |  | 65,812 |  |  |  | 46 |  |  |  | 1,310 |  |  |  | 64,548 |
State and political subdivision obligations |  |  | 84,034 |  |  |  | 457 |  |  |  | 842 |  |  |  | 83,649 |
Corporate debt securities |  |  | 1,539 |  |  |  | — |  |  |  | 10 |  |  |  | 1,529 |
Total held-to-maturity debt securities |  |  | 168,370 |  |  |  | 517 |  |  |  | 2,305 |  |  |  | 166,582 |
Total |  | $ | 284,397 |  |  | $ | 538 |  |  | $ | 6,430 |  |  | $ | 278,505 |
Schedule of Fair Value and Unrealized Loss on 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, 2019 and December 31, 2018.
(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, 2019 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 3 |  | $ | 6,988 |  |  | $ | 12 |  |  | 7 |  | $ | 11,940 |  |  | $ | 99 |  |  | 10 |  | $ | 18,928 |  |  | $ | 111 |
Mortgage-backed U.S. government agencies |  | 1 |  |  | 627 |  |  |  | 2 |  |  | 14 |  |  | 11,277 |  |  |  | 133 |  |  | 15 |  |  | 11,904 |  |  |  | 135 |
State and political subdivision obligations |  | 2 |  |  | 1,025 |  |  |  | 4 |  |  | 0 |  |  | — |  |  |  | — |  |  | 2 |  |  | 1,025 |  |  |  | 4 |
Total temporarily impaired available-for-sale debt securities |  | 6 |  | $ | 8,640 |  |  | $ | 18 |  |  | 21 |  | $ | 23,217 |  |  | $ | 232 |  |  | 27 |  | $ | 31,857 |  |  | $ | 250 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 3 |  | $ | 7,447 |  |  | $ | 15 |  |  | 1 |  | $ | 2,994 |  |  | $ | 5 |  |  | 4 |  | $ | 10,441 |  |  | $ | 20 |
Mortgage-backed U.S. government agencies |  | 7 |  |  | 11,239 |  |  |  | 15 |  |  | 15 |  |  | 13,403 |  |  |  | 104 |  |  | 22 |  |  | 24,642 |  |  |  | 119 |
Total temporarily impaired held-to-maturity debt securities |  | 10 |  | $ | 18,686 |  |  | $ | 30 |  |  | 16 |  | $ | 16,397 |  |  | $ | 109 |  |  | 26 |  | $ | 35,083 |  |  | $ | 139 |
Total |  | 16 |  | $ | 27,326 |  |  | $ | 48 |  |  | 37 |  | $ | 39,614 |  |  | $ | 341 |  |  | 53 |  | $ | 66,940 |  |  | $ | 389 |
(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, 2018 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 0 |  | $ | — |  |  | $ | — |  |  | 21 |  | $ | 38,386 |  |  | $ | 1,708 |  |  | 21 |  | $ | 38,386 |  |  | $ | 1,708 |
Mortgage-backed U.S. government agencies |  | 11 |  |  | 16,740 |  |  |  | 163 |  |  | 19 |  |  | 22,093 |  |  |  | 853 |  |  | 30 |  |  | 38,833 |  |  |  | 1,016 |
State and political subdivision obligations |  | 3 |  |  | 1,751 |  |  |  | 23 |  |  | 51 |  |  | 24,520 |  |  |  | 1,374 |  |  | 54 |  |  | 26,271 |  |  |  | 1,397 |
Corporate debt securities |  | 2 |  |  | 1,996 |  |  |  | 4 |  |  | 0 |  |  | — |  |  |  | — |  |  | 2 |  |  | 1,996 |  |  |  | 4 |
Total temporarily impaired available-for-sale securities |  | 16 |  | $ | 20,487 |  |  | $ | 190 |  |  | 91 |  | $ | 84,999 |  |  | $ | 3,935 |  |  | 107 |  | $ | 105,486 |  |  | $ | 4,125 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 1 |  | $ | 1,985 |  |  | $ | 10 |  |  | 3 |  | $ | 8,852 |  |  | $ | 133 |  |  | 4 |  | $ | 10,837 |  |  | $ | 143 |
Mortgage-backed U.S. government agencies |  | 10 |  |  | 16,165 |  |  |  | 79 |  |  | 35 |  |  | 42,431 |  |  |  | 1,231 |  |  | 45 |  |  | 58,596 |  |  |  | 1,310 |
State and political subdivision obligations |  | 26 |  |  | 11,321 |  |  |  | 111 |  |  | 77 |  |  | 29,460 |  |  |  | 731 |  |  | 103 |  |  | 40,781 |  |  |  | 842 |
Corporate debt securities |  | 1 |  |  | 1,529 |  |  |  | 10 |  |  | 0 |  |  | — |  |  |  | — |  |  | 1 |  |  | 1,529 |  |  |  | 10 |
Total temporarily impaired held to maturity securities |  | 38 |  | $ | 31,000 |  |  | $ | 210 |  |  | 115 |  | $ | 80,743 |  |  | $ | 2,095 |  |  | 153 |  | $ | 111,743 |  |  | $ | 2,305 |
Total |  | 54 |  | $ | 51,487 |  |  | $ | 400 |  |  | 206 |  | $ | 165,742 |  |  | $ | 6,030 |  |  | 260 |  | $ | 217,229 |  |  | $ | 6,430 |
Schedule of Gross Realized Gains (Losses) on Sales of Available-For-Sale Securities | Gross realized gains and losses on sales of available-for-sale debt securities for the three and nine months ended September 30, 2019 and 2018 are shown in the table below.
(Dollars in thousands) | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Realized gains |  | $ | 64 |  |  |  | $ | 30 |  |  |  | $ | 133 |  |  |  | $ | 141 |
Realized losses |  |  | (18 | ) |  |  |  | — |  |  |  |  | (63 | ) |  |  |  | (9 | )
Net gains |  | $ | 46 |  |  |  | $ | 30 |  |  |  | $ | 70 |  |  |  | $ | 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 September 30, 2019.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
September 30, 2019 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | — |  |  | $ | — |  |  | $ | 3,990 |  |  | $ | 3,992 |
Due after 1 year but within 5 years |  |  | 19,457 |  |  |  | 19,403 |  |  |  | 19,663 |  |  |  | 19,926 |
Due after 5 years but within 10 years |  |  | 16,463 |  |  |  | 16,505 |  |  |  | 79,347 |  |  |  | 81,930 |
Due after 10 years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 35,920 |  |  |  | 35,908 |  |  |  | 103,000 |  |  |  | 105,848 |
Mortgage-backed securities |  |  | 16,638 |  |  |  | 16,511 |  |  |  | 67,472 |  |  |  | 67,874 |
|  | $ | 52,558 |  |  | $ | 52,419 |  |  | $ | 170,472 |  |  | $ | 173,722 |

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