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Stock Based Compensation (Details) - Stock Options [Member] - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Number of options:
Number of Options outstanding, beginning	40,750	20,250	38,625
Number of Options granted		30,000
Number of Options exercised	8,000	9,500	14,550
Options forfeited or expired	750		3,825
Number of Options outstanding, ending	32,000	40,750	20,250
Number of Options exercisable	22,000	18,250	20,250
Weighted Average Exercise Price:
Weighted Average Exercise Price of Options outstanding, beginning	$ 21.69	$ 16.65	$ 17.29
Weighted Average Exercise Price of Options granted		23.30
Weighted Average Exercise Price of Options exercised	17.95	16.03	18.87
Weighted Average Exercise Price of Options forfeited or expired	18.85		18.51
Weighted Average Exercise Price of Options outstanding, ending	22.69	21.69	16.65
Weighted Average Exercise Price of Options exercisable	$ 22.69	$ 19.70	$ 16.65

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ 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)(1)(iii)
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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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-Publisher FASB
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-Section 50
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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (c)(1)(iv)(3)
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Net number of share options (or share units) granted during the period.

+ References

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Number of options outstanding, including both vested and non-vested options.

+ References

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-Publisher FASB
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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-Name Accounting Standards Codification
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