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Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | $ 84,797 | $ 90,052
Gross Unrealized Gains | 874 | 803
Gross Unrealized Losses | (367) | (727)
Fair Value | 85,304 | 90,128
U.S. Treasury and Government agencies [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 12,960 | 13,341
Gross Unrealized Gains | 113 | 69
Gross Unrealized Losses | (42) | (52)
Fair Value | 13,031 | 13,358
Mortgage-backed securities [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 57,876 | 62,035
Gross Unrealized Gains | 210 | 204
Gross Unrealized Losses | (310) | (636)
Fair Value | 57,776 | 61,603
State and political subdivisions [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 13,891 | 14,606
Gross Unrealized Gains | 551 | 530
Gross Unrealized Losses | (15) | (39)
Fair Value | 14,427 | 15,097
Equity securities [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 70 | 70
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Fair Value | $ 70 | $ 70

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