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Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | $ 107,731 | $ 90,052
Gross Unrealized Gains | 845 | 803
Gross Unrealized Losses | (639) | (727)
Fair Value | 107,937 | 90,128
U.S. Treasury and Government agencies [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 21,105 | 13,341
Gross Unrealized Gains | 82 | 69
Gross Unrealized Losses | (74) | (52)
Fair Value | 21,113 | 13,358
Mortgage-backed securities [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 72,469 | 62,035
Gross Unrealized Gains | 217 | 204
Gross Unrealized Losses | (539) | (636)
Fair Value | 72,147 | 61,603
State and political subdivisions [Member] |  |
Summary of amortized cost and approximate fair values of securities |  |
Amortized Cost | 14,087 | 14,606
Gross Unrealized Gains | 546 | 530
Gross Unrealized Losses | (26) | (39)
Fair Value | 14,607 | 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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- 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=65884222&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=66010992&loc=d3e26626-111562 + Details
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