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Investment Securities (Details Textual)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($) Position	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) Position	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Investments [Line Items]
Gross investment losses				$ 163,000
Investment Securities:
Consolidated investment securities portfolio modified, years			37 months 6 days		44 months 3 days
Proceeds from sales of investment securities — available for sale	$ 530,000	$ 0	$ 530,000	4,479,000
Available for sale Securities And Held To Maturity Securities In Unrealized Loss Positions | Position	65		65
Gross investment gains	$ 30,000		$ 30,000	$ 15,000
Available-for-sale Securities and Held-to-maturity Securities	121,682,000		121,682,000		$ 115,536,000
Deferred Compensation, Share-based Payments [Member] | Assets Held With Rabbi Trust [Member]
Investment Securities:
Equity Securities, FV-NI	$ 328,000		$ 328,000
Standard & Poor's, AAA Rating [Member]
Investments [Line Items]
Portfolio rated	57.50%		57.50%		57.50%
Securities Rated Below A [Member]
Investments [Line Items]
Portfolio rated	8.70%		8.70%		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

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Investment securities.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
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-Name Accounting Standards Codification
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