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Investment Securities - Amortized Costs, Gains and Losses, Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | $ 222,578 | $ 234,192
Gross Unrealized Gains | 123 | 158
Gross Unrealized Losses | (4,496) | (3,322)
Fair value | 218,205 | 231,028
U.S. Treasury |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 1,984 | 1,980
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (32) | (13)
Fair value | 1,952 | 1,967
U.S. government and federal agency obligations |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 10,235 | 12,341
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (269) | (268)
Fair value | 9,966 | 12,073
Government sponsored enterprises |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 43,784 | 37,321
Gross Unrealized Gains | 23 | 0
Gross Unrealized Losses | (472) | (424)
Fair value | 43,335 | 36,897
Obligations of states and political subdivisions |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 40,859 | 47,019
Gross Unrealized Gains | 28 | 114
Gross Unrealized Losses | (501) | (477)
Fair value | 40,386 | 46,656
Mortgage-backed securities |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 121,230 | 131,045
Gross Unrealized Gains | 72 | 44
Gross Unrealized Losses | (3,110) | (2,140)
Fair value | 118,192 | 128,949
Other debt securities |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 3,000 | 3,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair value | 3,000 | 3,000
Bank issued trust preferred securities |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 1,486 | 1,486
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (112) | 0
Fair value | $ 1,374 | $ 1,486

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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