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Investment Securities (Tables) | 6 Months Ended
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Jun. 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 June 30, 2018 and December 31, 2017 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 40,597 |  |  | $ | — |  |  | $ | 2,257 |  |  | $ | 38,340 |
Mortgage-backed U.S. government agencies |  |  | 43,713 |  |  |  | 1 |  |  |  | 1,288 |  |  |  | 42,426 |
State and political subdivision obligations |  |  | 31,551 |  |  |  | 3 |  |  |  | 1,980 |  |  |  | 29,574 |
Corporate debt securities |  |  | 1,350 |  |  |  | 1 |  |  |  | — |  |  |  | 1,351 |
Total available-for-sale debt securities |  |  | 117,211 |  |  |  | 5 |  |  |  | 5,525 |  |  |  | 111,691 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 10,985 |  |  |  | — |  |  |  | 201 |  |  |  | 10,784 |
Mortgage-backed U.S. government agencies |  |  | 66,512 |  |  |  | 4 |  |  |  | 1,649 |  |  |  | 64,867 |
State and political subdivision obligations |  |  | 75,824 |  |  |  | 57 |  |  |  | 1,516 |  |  |  | 74,365 |
Total held-to-maturity debt securities |  |  | 153,321 |  |  |  | 61 |  |  |  | 3,366 |  |  |  | 150,016 |
Total |  | $ | 270,532 |  |  | $ | 66 |  |  | $ | 8,891 |  |  | $ | 261,707 |
(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 six months ended June 30, 2018 and 2017 are shown in the table below.
(Dollars in thousands) | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
| 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Realized gains |  | $ | 11 |  |  |  | $ | 77 |  |  |  | $ | 111 |  |  | $ | 200 |
Realized losses |  |  | (7 | ) |  |  |  | (65 | ) |  |  |  | (9 | ) |  |  | (180 | )
Net gains |  | $ | 4 |  |  |  | $ | 12 |  |  |  | $ | 102 |  |  | $ | 20 |
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 June 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 |
June 30, 2018 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 3 |  | $ | 4,453 |  |  | $ | 231 |  |  | 19 |  | $ | 33,887 |  |  | $ | 2,026 |  |  | 22 |  | $ | 38,340 |  |  | $ | 2,257 |
Mortgage-backed U.S. government agencies |  | 15 |  |  | 23,474 |  |  |  | 407 |  |  | 15 |  |  | 18,916 |  |  |  | 881 |  |  | 30 |  |  | 42,390 |  |  |  | 1,288 |
State and political subdivision obligations |  | 15 |  |  | 8,094 |  |  |  | 356 |  |  | 41 |  |  | 18,486 |  |  |  | 1,624 |  |  | 56 |  |  | 26,580 |  |  |  | 1,980 |
Total temporarily impaired available-for-sale debt securities |  | 33 |  |  | 36,021 |  |  |  | 994 |  |  | 75 |  |  | 71,289 |  |  |  | 4,531 |  |  | 108 |  |  | 107,310 |  |  |  | 5,525 |
Held-to-maturity debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 3 |  |  | 8,793 |  |  |  | 191 |  |  | 1 |  |  | 1,991 |  |  |  | 10 |  |  | 4 |  |  | 10,784 |  |  |  | 201 |
Mortgage-backed U.S. government agencies |  | 37 |  |  | 54,276 |  |  |  | 1,324 |  |  | 7 |  |  | 8,825 |  |  |  | 325 |  |  | 44 |  |  | 63,101 |  |  |  | 1,649 |
State and political subdivision obligations |  | 134 |  |  | 53,362 |  |  |  | 1,461 |  |  | 3 |  |  | 1,486 |  |  |  | 55 |  |  | 137 |  |  | 54,848 |  |  |  | 1,516 |
Total temporarily impaired held-to-maturity debt securities |  | 174 |  |  | 116,431 |  |  |  | 2,976 |  |  | 11 |  |  | 12,302 |  |  |  | 390 |  |  | 185 |  |  | 128,733 |  |  |  | 3,366 |
Total |  | 207 |  | $ | 152,452 |  |  | $ | 3,970 |  |  | 86 |  | $ | 83,591 |  |  | $ | 4,921 |  |  | 293 |  | $ | 236,043 |  |  | $ | 8,891 |
(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 |  | 0 |  |  | — |  |  |  | — |  |  | 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 |  | 0 |  |  | — |  |  |  | — |  |  | 4 |  |  | 10,894 |  |  |  | 90 |  |  | 4 |  |  | 10,894 |  |  |  | 90 |
Mortgage-backed U.S. government agencies |  | 0 |  |  | — |  |  |  | — |  |  | 35 |  |  | 52,949 |  |  |  | 523 |  |  | 35 |  |  | 52,949 |  |  |  | 523 |
State and political subdivision obligations |  | 0 |  |  | — |  |  |  | — |  |  | 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 June 30, 2018.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
June 30, 2018 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 1,460 |  |  | $ | 1,460 |  |  | $ | 2,001 |  |  | $ | 1,991 |
Due after 1 year but within 5 years |  |  | 18,711 |  |  |  | 18,050 |  |  |  | 11,705 |  |  |  | 11,494 |
Due after 5 years but within 10 years |  |  | 43,730 |  |  |  | 41,041 |  |  |  | 71,195 |  |  |  | 69,796 |
Due after 10 years |  |  | 9,597 |  |  |  | 8,714 |  |  |  | 1,909 |  |  |  | 1,868 |
|  |  | 73,498 |  |  |  | 69,265 |  |  |  | 86,810 |  |  |  | 85,149 |
Mortgage-backed securities |  |  | 43,713 |  |  |  | 42,426 |  |  |  | 66,511 |  |  |  | 64,867 |
|  | $ | 117,211 |  |  | $ | 111,691 |  |  | $ | 153,321 |  |  | $ | 150,016 |

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