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Benefit Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Allocated share-based compensation expense			$ 1,257
Compensation cost not yet recognized	$ 2,100		$ 2,100
Period for recognition			2 years
Percentage of annual retainer received in either common stock or deferred stock rights			100.00%
Restricted Stock Awards
Nonvested, weighted average grant date fair value	$ 31.37		$ 31.37		$ 24.44
Plan 2013
Number of shares authorized (in shares)					750,000
Deferred Stock Units
Nonvested, weighted average grant date fair value	$ 0.00		$ 0.00		$ 0.00
Director
Common stock shares reserved for future grants (in shares)			180,000
Director | Restricted Stock Awards
Nonvested, weighted average grant date fair value					20
Director | Deferred Stock Units
Nonvested, weighted average grant date fair value					$ 20
Voting and Nonvoting Common Stock | Voting and Nonvoting Common Stock
Allocated share-based compensation expense	$ 300	$ 300	$ 1,257	$ 800

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Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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