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NOTE 5: INVESTMENT SECURITIES: Investment Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Available For Sale Securities Amortized Cost Amount | $ 172,095 |
Available for Sale Securities Fair Value | 171,621 |
Held-to-maturity Securities, Fair Value | 130 | $ 131
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |
Available For Sale Securities Amortized Cost Amount | 120,163 | 123,300
Available-for-sale Securities, Gross Unrealized Gain | 769 | 871
Available-for-sale Securities, Gross Unrealized Loss | 3,134 | 1,638
Available for Sale Securities Fair Value | $ 117,798 | $ 122,533
Available for Sale Securities Tax Equivalent Yield | 2.30% | 2.19%
US States and Political Subdivisions Debt Securities |  |
Available For Sale Securities Amortized Cost Amount | $ 51,932 | $ 53,930
Available-for-sale Securities, Gross Unrealized Gain | 1,898 | 2,716
Available-for-sale Securities, Gross Unrealized Loss | 7 | 0
Available for Sale Securities Fair Value | $ 53,823 | $ 56,646
Available for Sale Securities Tax Equivalent Yield | 4.81% | 4.72%
Held to Maturity Securities Amortized Cost | $ 130 | $ 130
Held to Maturity Securities Gross Unrealized Gains | 0 | 1
Held to Maturity Securities Gross Unrealized Losses | 0 | 0
Held-to-maturity Securities, Fair Value | $ 130 | $ 131
Held to Maturity Securities Tax Equivalent Yield | 6.14% | 6.14%
Available-for-sale Securities |  |
Available For Sale Securities Amortized Cost Amount | $ 172,095 | $ 177,230
Available-for-sale Securities, Gross Unrealized Gain | 2,667 | 3,587
Available-for-sale Securities, Gross Unrealized Loss | 3,141 | 1,638
Available for Sale Securities Fair Value | $ 171,621 | $ 179,179
Available for Sale Securities Tax Equivalent Yield | 3.06% | 2.96%

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