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Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | $ 214,185 | $ 217,635
Gross Unrealized Gains | 395 | 261
Gross Unrealized Losses | (1,930) | (3,384)
Fair value | 212,650 | 214,512
U.S. government and federal agency obligations |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 12,653 | 13,667
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (180) | (303)
Fair value | 12,473 | 13,364
Government sponsored enterprises |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 32,854 | 32,786
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (235) | (329)
Fair value | 32,619 | 32,459
Obligations of states and political subdivisions |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 47,730 | 42,666
Gross Unrealized Gains | 246 | 123
Gross Unrealized Losses | (250) | (757)
Fair value | 47,726 | 42,032
Mortgage-backed securities |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 120,948 | 128,516
Gross Unrealized Gains | 149 | 136
Gross Unrealized Losses | (1,265) | (1,995)
Fair value | 119,832 | 126,657
Mortgage-backed securities | Residential - government agencies |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 119,961 | 127,527
Gross Unrealized Gains | 140 | 124
Gross Unrealized Losses | (1,265) | (1,995)
Fair value | 118,836 | 125,656
Mortgage-backed securities | Commercial - government agencies |  |
Amortized cost and fair value of debt securities available-for-sale |  |
Total Amortized Cost | 987 | 989
Gross Unrealized Gains | 9 | 12
Gross Unrealized Losses | 0 | 0
Fair value | $ 996 | $ 1,001

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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