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Investment Securities (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments [Line Items]
Gross investment gains	$ 148,000	$ 27,000
Investment Securities:
Consolidated investment securities portfolio modified, years	46 months 27 days		44 months 9 days
Proceeds from sales of investment securities — available for sale	$ 4,479,000	$ 5,653,000
Book value of securities available for sale and held to maturity	$ 115,980,000		$ 117,181,000
Available-for-sale, Securities and Held To Maturity Securities in Unrealized Loss Positions	190
Standard & Poor's, AAA Rating [Member]
Investments [Line Items]
Portfolio rated	57.40%		57.80%
Standard & Poor's, A Rating [Member]
Investments [Line Items]
Portfolio rated	9.40%		9.70%
Maximum [Member]
Investment Securities:
Consolidated investment securities portfolio modified, years	60 months
Minimum [Member]
Investment Securities:
Consolidated investment securities portfolio modified, years	24 months

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The disclosure of the number of positions with an unrealized loss includes both available-for-sale and held to maturity securities.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

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