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Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities |  |
Amortized Cost | $ 82,969 | $ 90,052
Gross Unrealized Gains | 598 | 803
Gross Unrealized Losses | (777) | (727)
Fair Value | 82,790 | 90,128
U.S. Treasury and Government agencies [Member] |  |
Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities |  |
Amortized Cost | 12,715 | 13,341
Gross Unrealized Gains | 62 | 69
Gross Unrealized Losses | (69) | (52)
Fair Value | 12,708 | 13,358
Mortgage-backed securities [Member] |  |
Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities |  |
Amortized Cost | 57,355 | 62,035
Gross Unrealized Gains | 97 | 204
Gross Unrealized Losses | (690) | (636)
Fair Value | 56,762 | 61,603
State and political subdivisions [Member] |  |
Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale securities |  |
Amortized Cost | 12,829 | 14,606
Gross Unrealized Gains | 439 | 530
Gross Unrealized Losses | (18) | (39)
Fair Value | 13,250 | 15,097
Equity securities [Member] |  |
Summary of amortized cost and fair values with gross unrealized gains and losses of available-for-sale 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 held-to-maturity nor trading. + 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=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity 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 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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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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