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Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | $ 93,179 | $ 82,969
Gross Unrealized Gains | 408 | 598
Gross Unrealized Losses | (1,600) | (777)
Fair Value | 91,987 | 82,790
U.S. Treasury and Government agencies [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 14,299 | 12,715
Gross Unrealized Gains | 42 | 62
Gross Unrealized Losses | (175) | (69)
Fair Value | 14,166 | 12,708
Mortgage-backed securities [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 66,068 | 57,355
Gross Unrealized Gains | 57 | 97
Gross Unrealized Losses | (1,394) | (690)
Fair Value | 64,731 | 56,762
State and political subdivisions [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 12,812 | 12,829
Gross Unrealized Gains | 309 | 439
Gross Unrealized Losses | (31) | (18)
Fair Value | $ 13,090 | 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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- Definition Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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