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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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- Definition 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=96867065&loc=d3e5070-113901 + Details
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- Definition 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 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=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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