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Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments [Abstract] |
Amortized Cost and Fair Value of Investment Securities | The amortized cost, gross unrealized gains and losses, and fair value of investment securities at September 30, 2018 and December 31, 2017 were as follows (in thousands):
|  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
September 30, 2018 |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  | $ | 109,612 |  |  | $ | - |  |  | $ | (1,343 | ) |  | $ | 108,269 |
U.S. treasury securities |  |  | 33,798 |  |  |  | - |  |  |  | (961 | ) |  |  | 32,837 |
Obligations of state and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions |  |  | 51,941 |  |  |  | 116 |  |  |  | (459 | ) |  |  | 51,598 |
Corporate obligations |  |  | 3,000 |  |  |  | - |  |  |  | - |  |  |  | 3,000 |
Mortgage-backed securities in |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government sponsored entities |  |  | 45,951 |  |  |  | 2 |  |  |  | (1,231 | ) |  |  | 44,722 |
Total available-for-sale securities |  | $ | 244,302 |  |  | $ | 118 |  |  | $ | (3,994 | ) |  | $ | 240,426 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  | $ | 99,454 |  |  | $ | 26 |  |  | $ | (593 | ) |  | $ | 98,887 |
U.S. treasury securities |  |  | 28,782 |  |  |  | - |  |  |  | (178 | ) |  |  | 28,604 |
Obligations of state and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions |  |  | 78,409 |  |  |  | 820 |  |  |  | (139 | ) |  |  | 79,090 |
Corporate obligations |  |  | 3,000 |  |  |  | 83 |  |  |  | - |  |  |  | 3,083 |
Mortgage-backed securities in |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government sponsored entities |  |  | 45,385 |  |  |  | 19 |  |  |  | (377 | ) |  |  | 45,027 |
Equity securities in financial institutions |  |  | 92 |  |  |  | - |  |  |  | (1 | ) |  |  | 91 |
Total available-for-sale securities |  | $ | 255,122 |  |  | $ | 948 |  |  | $ | (1,288 | ) |  | $ | 254,782 |
Unrealized Losses and Fair Value of Investments | The following table shows the Company's gross unrealized losses and fair value of the Company's investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time, which individual securities have been in a continuous unrealized loss position, at September 30, 2018 and December 31, 2017 (in thousands). As of September 30, 2018, the Company owned 143 securities whose fair value was less than their cost basis.
September 30, 2018 |  | Less than Twelve Months |  |  | Twelve Months or Greater |  |  | Total |
|  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. agency securities |  | $ | 54,399 |  |  | $ | (656 | ) |  | $ | 40,554 |  |  | $ | (687 | ) |  | $ | 94,953 |  |  | $ | (1,343 | )
U.S. treasury securities |  |  | 32,837 |  |  |  | (961 | ) |  |  | - |  |  |  | - |  |  |  | 32,837 |  |  |  | (961 | )
Obligations of state and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions |  |  | 26,648 |  |  |  | (249 | ) |  |  | 8,381 |  |  |  | (210 | ) |  |  | 35,029 |  |  |  | (459 | )
Mortgage-backed securities in |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government sponsored entities |  |  | 17,167 |  |  |  | (299 | ) |  |  | 24,056 |  |  |  | (932 | ) |  |  | 41,223 |  |  |  | (1,231 | )
Total securities |  | $ | 131,051 |  |  | $ | (2,165 | ) |  | $ | 72,991 |  |  | $ | (1,829 | ) |  | $ | 204,042 |  |  | $ | (3,994 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency securities |  | $ | 74,952 |  |  | $ | (421 | ) |  | $ | 16,928 |  |  | $ | (172 | ) |  | $ | 91,880 |  |  | $ | (593 | )
U.S. treasury securities |  |  | 28,604 |  |  |  | (178 | ) |  |  | - |  |  |  | - |  |  |  | 28,604 |  |  |  | (178 | )
Obligations of states and |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
political subdivisions |  |  | 14,885 |  |  |  | (85 | ) |  |  | 5,958 |  |  |  | (54 | ) |  |  | 20,843 |  |  |  | (139 | )
Mortgage-backed securities in |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
government sponsored entities |  |  | 27,154 |  |  |  | (190 | ) |  |  | 13,822 |  |  |  | (187 | ) |  |  | 40,976 |  |  |  | (377 | )
Equity securities in financial institutions |  |  | 91 |  |  |  | (1 | ) |  |  | - |  |  |  | - |  |  |  | 91 |  |  |  | (1 | )
Total securities |  | $ | 145,686 |  |  | $ | (875 | ) |  | $ | 36,708 |  |  | $ | (413 | ) |  | $ | 182,394 |  |  | $ | (1,288 | )
Gross Gains and Losses on Available-for-sale Securities | The gross gains and losses were as follows (in thousands):
|  | Three Months Ended |  |  | Nine Months Ended |
|  | Sept. 30, |  |  | Sept. 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Gross gains on available for sale securities |  | $ | 161 |  |  | $ | 9 |  |  | $ | 161 |  |  | $ | 211 |
Gross losses on available for sale securities |  |  | (169 | ) |  |  | - |  |  |  | (169 | ) |  |  | (7 | )
Net gains |  | $ | (8 | ) |  | $ | 9 |  |  | $ | (8 | ) |  | $ | 204 |
Unrealized Gains (Losses) Related to Equity Securities | The following table presents the net gains on the Company's equity investments recognized in earnings during the three month and nine month periods ended September 30, 2018, and the portion of unrealized gains for the period that relates to equity investments held at September 30, 2018 (in thousands):
Equity Securities |  | Three Months Ended September 30, 2018 |  |  | Nine Months Ended September 30, 2018 |
Net gains (losses) recognized in equity securities during the period |  | $ | (4 | ) |  | $ | 9 |
Less: Net gains realized on the sale of equity securities during the period |  |  | - |  |  |  | - |
Net unrealized gains (losses) |  | $ | (4 | ) |  | $ | 9 |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity | The amortized cost and fair value of debt securities (excludes equity securities) at September 30, 2018, by contractual maturity, are shown below (in thousands):
|  | Amortized |  |  |  |
|  | Cost |  |  | Fair Value |
Available-for-sale debt securities: |  |  |  |  |  |
Due in one year or less |  | $ | 29,087 |  |  | $ | 29,035 |
Due after one year through five years |  |  | 105,536 |  |  |  | 103,350 |
Due after five years through ten years |  |  | 59,609 |  |  |  | 58,574 |
Due after ten years |  |  | 50,070 |  |  |  | 49,467 |
Total |  | $ | 244,302 |  |  | $ | 240,426 |

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