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Benefit Plans (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Allocated share-based compensation expense			$ 358
Compensation cost not yet recognized	$ 1,100		$ 1,100
Period for recognition			2 years 1 month
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	$ 19.81		$ 19.81		$ 18.17
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	$ 200	$ 200	$ 400	$ 500

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- Definition

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Share-based Compensation Arrangement by Share-base Payment Award, Percentage of Annual Retainer Received in Common Stock or Deferred Stock Rights

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Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

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