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Stock Options, Stock Grants and New Stock (Stock Options by Exercise Price Range) (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Outstanding options (shares) | shares	145,511
Number of exercisable options (shares) | shares	119,861
$11.55 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (dollars per share)	$ 11.55
Number of Outstanding options (shares) | shares	56,710
Weighted average exercise price (dollars per share)	$ 11.55
Weighted average remaining contractual life in years (years)	3 years 23 days
Number of exercisable options (shares) | shares	56,710
Exercisable options, weighted average exercise price (dollars per share)	$ 11.55
$11.35 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (dollars per share)	$ 11.35
Number of Outstanding options (shares) | shares	25,076
Weighted average exercise price (dollars per share)	$ 11.35
Weighted average remaining contractual life in years (years)	4 years 1 month 5 days
Number of exercisable options (shares) | shares	25,076
Exercisable options, weighted average exercise price (dollars per share)	$ 11.35
$13.70 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (dollars per share)	$ 13.70
Number of Outstanding options (shares) | shares	27,801
Weighted average exercise price (dollars per share)	$ 13.70
Weighted average remaining contractual life in years (years)	5 years 1 month 6 days
Number of exercisable options (shares) | shares	22,084
Exercisable options, weighted average exercise price (dollars per share)	$ 13.70
$14.76 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (dollars per share)	$ 14.76
Number of Outstanding options (shares) | shares	8,109
Weighted average exercise price (dollars per share)	$ 14.76
Weighted average remaining contractual life in years (years)	6 years 1 month 19 days
Number of exercisable options (shares) | shares	4,865
Exercisable options, weighted average exercise price (dollars per share)	$ 14.76
$16.01 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices (dollars per share)	$ 16.01
Number of Outstanding options (shares) | shares	27,815
Weighted average exercise price (dollars per share)	$ 16.01
Weighted average remaining contractual life in years (years)	7 years 1 month 10 days
Number of exercisable options (shares) | shares	11,126
Exercisable options, weighted average exercise price (dollars per share)	$ 16.01

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Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ 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)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average remaining contractual term of outstanding stock options, 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 (e)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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