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Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | $ 86,207 | $ 82,969
Gross Unrealized Gains | 166 | 598
Gross Unrealized Losses | (2,259) | (777)
Fair Value | 84,114 | 82,790
U.S. Treasury and Government agencies [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 11,897 | 12,715
Gross Unrealized Gains | 5 | 62
Gross Unrealized Losses | (326) | (69)
Fair Value | 11,576 | 12,708
Mortgage-backed securities [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 63,312 | 57,355
Gross Unrealized Gains | 34 | 97
Gross Unrealized Losses | (1,876) | (690)
Fair Value | 61,470 | 56,762
State and political subdivisions [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 10,998 | 12,829
Gross Unrealized Gains | 127 | 439
Gross Unrealized Losses | (57) | (18)
Fair Value | $ 11,068 | 13,250
Equity securities [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost |  | 70
Gross Unrealized Gains |  |
Gross Unrealized Losses |  |
Fair Value |  | $ 70

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