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Securities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Summary of amortized cost and approximate fair values of securities
Amortized Cost	$ 93,179	$ 82,969
Gross Unrealized Gains	408	598
Gross Unrealized Losses	(1,600)	(777)
Fair Value	91,987	82,790
U.S. Treasury and Government agencies [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	14,299	12,715
Gross Unrealized Gains	42	62
Gross Unrealized Losses	(175)	(69)
Fair Value	14,166	12,708
Mortgage-backed securities [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	66,068	57,355
Gross Unrealized Gains	57	97
Gross Unrealized Losses	(1,394)	(690)
Fair Value	64,731	56,762
State and political subdivisions [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost	12,812	12,829
Gross Unrealized Gains	309	439
Gross Unrealized Losses	(31)	(18)
Fair Value	$ 13,090	13,250
Equity securities [Member]
Summary of amortized cost and approximate fair values of securities
Amortized Cost		70
Gross Unrealized Gains
Gross Unrealized Losses
Fair Value		$ 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
-SubTopic 10
-Section 50
-Paragraph 2
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