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Investment Securities (Details Textual)	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) Position	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Investments [Line Items]
Gross investment losses	$ 0	$ 148,000
Investment Securities:
Consolidated investment securities portfolio modified, years	41 months 21 days		44 months 3 days
Proceeds from sales of investment securities — available for sale	$ 0	$ 4,479,000
Book value of securities available for sale and held to maturity	$ 118,370,000		$ 115,536,000
Available for sale Securities And Held To Maturity Securities In Unrealized Loss Positions | Position	129
Standard & Poor's, AAA Rating [Member]
Investments [Line Items]
Portfolio rated	58.50%		57.50%
Securities Rated Below A [Member]
Investments [Line Items]
Portfolio rated	8.40%		10.00%
Maximum [Member]
Investment Securities:
Consolidated investment securities portfolio modified, years	60 months
Minimum [Member]
Investment Securities:
Consolidated investment securities portfolio modified, years	24 months

X

- Definition

The number of investment securities positions to impaired.

+ References

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- Definition

The carrying value of AFS and HTM securities pledged as collateral.

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Consolidated investment securities portfolio modified, years.

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Investment securities.

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Percentage of investment securities portfolio rated.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26853-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3179-108585

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