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Equity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Nonvested Options, Number of Shares
Beginning of year	401,440
Options granted	174,600	148,950	158,300
Vested or forfeited	(144,805)
End of year	431,235	401,440
Weighted Average Grant Date Fair Value
Beginning of year	$ 7.14
Granted	9.82
Vested or forfeited	7.13
End of year	$ 8.22	$ 7.14

X

- Definition

Number of nonvested share-based payment award options that vested or were forfeited during the period.

+ References

No definition available.

+ Details

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X

- Definition

Weighted average grant date fair value of nonvested options that were vested or forfeited during the period.

+ References

No definition available.

+ Details

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X

- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

+ Details

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X

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

Number of non-vested options outstanding.

+ References

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

Weighted average grant-date fair value of non-vested options outstanding.

+ References

No definition available.

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