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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
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, 2018 and December 31, 2017 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
September 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 40,590 |  |  | $ | — |  |  | $ | 2,640 |  |  | $ | 37,950 |
Mortgage-backed U.S. government agencies |  |  | 41,677 |  |  |  | - |  |  |  | 1,490 |  |  |  | 40,187 |
State and political subdivision obligations |  |  | 33,306 |  |  |  | 54 |  |  |  | 2,213 |  |  |  | 31,147 |
Corporate debt securities |  |  | 1,250 |  |  |  | - |  |  |  | 7 |  |  |  | 1,243 |
Total available-for-sale debt securities |  |  | 116,823 |  |  |  | 54 |  |  |  | 6,350 |  |  |  | 110,527 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 16,480 |  |  |  | 5 |  |  |  | 261 |  |  |  | 16,224 |
Mortgage-backed U.S. government agencies |  |  | 69,344 |  |  |  | 2 |  |  |  | 1,998 |  |  |  | 67,348 |
State and political subdivision obligations |  |  | 84,154 |  |  |  | 19 |  |  |  | 2,157 |  |  |  | 82,016 |
Corporate debt securities |  |  | 1,543 |  |  |  | — |  |  |  | 11 |  |  |  | 1,532 |
Total held-to-maturity debt securities |  |  | 171,521 |  |  |  | 26 |  |  |  | 4,427 |  |  |  | 167,120 |
Total |  | $ | 288,344 |  |  | $ | 80 |  |  | $ | 10,777 |  |  | $ | 277,647 |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 40,125 |  |  | $ | — |  |  | $ | 1,395 |  |  | $ | 38,730 |
Mortgage-backed U.S. government agencies |  |  | 26,398 |  |  |  | 2 |  |  |  | 569 |  |  |  | 25,831 |
State and political subdivision obligations |  |  | 27,775 |  |  |  | 7 |  |  |  | 739 |  |  |  | 27,043 |
Corporate debt securities |  |  | 1,350 |  |  |  | 5 |  |  |  | — |  |  |  | 1,355 |
Total available-for-sale debt securities |  |  | 95,648 |  |  |  | 14 |  |  |  | 2,703 |  |  |  | 92,959 |
Available-for-sale equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | 550 |  |  |  | — |  |  |  | 44 |  |  |  | 506 |
Total available-for-sale equity securities |  |  | 550 |  |  |  | — |  |  |  | 44 |  |  |  | 506 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 10,984 |  |  |  | — |  |  |  | 90 |  |  |  | 10,894 |
Mortgage-backed U.S. government agencies |  |  | 53,472 |  |  |  | — |  |  |  | 523 |  |  |  | 52,949 |
State and political subdivision obligations |  |  | 36,900 |  |  |  | 41 |  |  |  | 301 |  |  |  | 36,640 |
Total held-to-maturity debt securities |  |  | 101,356 |  |  |  | 41 |  |  |  | 914 |  |  |  | 100,483 |
Total |  | $ | 197,554 |  |  | $ | 55 |  |  | $ | 3,661 |  |  | $ | 193,948 |
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, 2018 and 2017 are shown in the table below.
(Dollars in thousands) | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Realized gains |  | $ | 30 |  |  |  | $ | 46 |  |  |  | $ | 141 |  |  | $ | 246 |
Realized losses |  |  | - |  |  |  |  | (24 | ) |  |  |  | (9 | ) |  |  | (204 | )
Net gains |  | $ | 30 |  |  |  | $ | 22 |  |  |  | $ | 132 |  |  | $ | 42 |
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, 2018 and December 31, 2017.
(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, 2018 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 1 |  | $ | 484 |  |  | $ | 4 |  |  | 21 |  |  | $ | 37,466 |  |  | $ | 2,636 |  |  | 22 |  | $ | 37,950 |  |  | $ | 2,640 |
Mortgage-backed U.S. government agencies |  | 12 |  |  | 18,385 |  |  |  | 360 |  |  | 18 |  |  |  | 21,777 |  |  |  | 1,130 |  |  | 30 |  |  | 40,162 |  |  |  | 1,490 |
State and political subdivision obligations |  | 14 |  |  | 7,144 |  |  |  | 285 |  |  | 45 |  |  |  | 20,283 |  |  |  | 1,928 |  |  | 59 |  |  | 27,427 |  |  |  | 2,213 |
Corporate debt securities |  | 1 |  |  | 993 |  |  |  | 7 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 1 |  |  | 993 |  |  |  | 7 |
Total temporarily impaired available-for-sale debt securities |  | 28 |  |  | 27,006 |  |  |  | 656 |  |  | 84 |  |  |  | 79,526 |  |  |  | 5,694 |  |  | 112 |  |  | 106,532 |  |  |  | 6,350 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 4 |  |  | 9,313 |  |  |  | 206 |  |  | 2 |  |  |  | 4,942 |  |  |  | 55 |  |  | 6 |  |  | 14,255 |  |  |  | 261 |
Mortgage-backed U.S. government agencies |  | 35 |  |  | 49,974 |  |  |  | 1,279 |  |  | 12 |  |  |  | 16,406 |  |  |  | 719 |  |  | 47 |  |  | 66,380 |  |  |  | 1,998 |
State and political subdivision obligations |  | 171 |  |  | 69,513 |  |  |  | 1,730 |  |  | 20 |  |  |  | 7,147 |  |  |  | 427 |  |  | 191 |  |  | 76,660 |  |  |  | 2,157 |
Corporate debt securities |  | 1 |  |  | 1,532 |  |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | — |  |  | 1 |  |  | 1,532 |  |  |  | 11 |
Total temporarily impaired held-to-maturity debt securities |  | 211 |  |  | 130,332 |  |  |  | 3,226 |  |  | 34 |  |  |  | 28,495 |  |  |  | 1,201 |  |  | 245 |  |  | 158,827 |  |  |  | 4,427 |
Total |  | 239 |  | $ | 157,338 |  |  | $ | 3,882 |  |  | 118 |  |  | $ | 108,021 |  |  | $ | 6,895 |  |  | 357 |  | $ | 265,359 |  |  | $ | 10,777 |
(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, 2017 |  | Securities |  |  | Value |  |  | Losses |  |  | Securities |  | Value |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 3 |  |  | $ | 5,008 |  |  | $ | 184 |  |  | 18 |  | $ | 33,722 |  |  | $ | 1,211 |  |  | 21 |  | $ | 38,730 |  |  | $ | 1,395 |
Mortgage-backed U.S. government agencies |  | 4 |  |  |  | 5,267 |  |  |  | 75 |  |  | 15 |  |  | 20,497 |  |  |  | 494 |  |  | 19 |  |  | 25,764 |  |  |  | 569 |
State and political subdivision obligations |  | 11 |  |  |  | 6,144 |  |  |  | 102 |  |  | 40 |  |  | 19,091 |  |  |  | 637 |  |  | 51 |  |  | 25,235 |  |  |  | 739 |
Equity securities |  |  | — |  |  |  | — |  |  |  | — |  |  | 1 |  |  | 506 |  |  |  | 44 |  |  | 1 |  |  | 506 |  |  |  | 44 |
Total temporarily impaired available-for-sale securities |  | 18 |  |  | $ | 16,419 |  |  | $ | 361 |  |  | 74 |  | $ | 73,816 |  |  | $ | 2,386 |  |  | 92 |  | $ | 90,235 |  |  | $ | 2,747 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | — |  |  |  | — |  |  |  | — |  |  | 4 |  |  | 10,894 |  |  |  | 90 |  |  | 4 |  |  | 10,894 |  |  |  | 90 |
Mortgage-backed U.S. government agencies |  |  | — |  |  |  | — |  |  |  | — |  |  | 35 |  |  | 52,949 |  |  |  | 523 |  |  | 35 |  |  | 52,949 |  |  |  | 523 |
State and political subdivision obligations |  |  | — |  |  |  | — |  |  |  | — |  |  | 77 |  |  | 29,976 |  |  |  | 301 |  |  | 77 |  |  | 29,976 |  |  |  | 301 |
Total temporarily impaired held to maturity securities |  | 0 |  |  |  | — |  |  |  | — |  |  | 116 |  |  | 93,819 |  |  |  | 914 |  |  | 116 |  |  | 93,819 |  |  |  | 914 |
Total |  | 18 |  |  | $ | 16,419 |  |  | $ | 361 |  |  | 190 |  | $ | 167,635 |  |  | $ | 3,300 |  |  | 208 |  | $ | 184,054 |  |  | $ | 3,661 |
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, 2018.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
September 30, 2018 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | - |  |  | $ | - |  |  | $ | 3,084 |  |  | $ | 3,080 |
Due after 1 year but within 5 years |  |  | 19,586 |  |  |  | 18,828 |  |  |  | 15,466 |  |  |  | 15,163 |
Due after 5 years but within 10 years |  |  | 43,451 |  |  |  | 40,271 |  |  |  | 82,415 |  |  |  | 80,337 |
Due after 10 years |  |  | 12,109 |  |  |  | 11,241 |  |  |  | 1,212 |  |  |  | 1,192 |
|  |  | 75,146 |  |  |  | 70,340 |  |  |  | 102,177 |  |  |  | 99,772 |
Mortgage-backed securities |  |  | 41,677 |  |  |  | 40,187 |  |  |  | 69,344 |  |  |  | 67,348 |
|  | $ | 116,823 |  |  | $ | 110,527 |  |  | $ | 171,521 |  |  | $ | 167,120 |

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