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Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | $ 233,496 | $ 229,706
Gross Unrealized Gains | 77 | 158
Gross Unrealized Losses | (5,972) | (3,322)
Fair value | 227,601 | 226,542
U.S. Treasury |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 1,983 | 1,980
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (53) | (13)
Fair value | 1,930 | 1,967
U.S. government and federal agency obligations |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 11,443 | 12,341
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (351) | (268)
Fair value | 11,092 | 12,073
Government sponsored enterprises |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 46,773 | 37,321
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (718) | (424)
Fair value | 46,059 | 36,897
Obligations of states and political subdivisions |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 42,054 | 47,019
Gross Unrealized Gains | 38 | 114
Gross Unrealized Losses | (633) | (477)
Fair value | 41,459 | 46,656
Residential - government agencies |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 131,243 | 131,045
Gross Unrealized Gains | 35 | 44
Gross Unrealized Losses | (4,217) | (2,140)
Fair value | $ 127,061 | $ 128,949

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