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Securities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Summary of amortized cost and approximate fair values of securities
Amortized Cost	$ 84,797	$ 90,052
Gross Unrealized Gains	874	803
Gross Unrealized Losses	(367)	(727)
Fair Value	85,304	90,128
U.S. Treasury and Government agencies [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	12,960	13,341
Gross Unrealized Gains	113	69
Gross Unrealized Losses	(42)	(52)
Fair Value	13,031	13,358
Mortgage-backed securities [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	57,876	62,035
Gross Unrealized Gains	210	204
Gross Unrealized Losses	(310)	(636)
Fair Value	57,776	61,603
State and political subdivisions [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	13,891	14,606
Gross Unrealized Gains	551	530
Gross Unrealized Losses	(15)	(39)
Fair Value	14,427	15,097
Equity securities [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	70	70
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value	$ 70	$ 70

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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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ 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 45
-Paragraph 2
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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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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
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-Section 50
-Paragraph 2
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