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Available-for-Sale Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	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

X

- 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

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X

- 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

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No definition available.

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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

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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

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