Employee Benefits and Stock Compensation - Summary of Information Related to Options (Details)	12 Months Ended
Dec. 31, 2017 $ / shares shares
Options Outstanding \| shares	951,349
Remaining contractual Life (Years)	6 years 10 months 24 days
Shares Exercisable \| shares	517,100
Weighted Average Exercise Price	$ 12.09
Range of Exercise Prices 10.54 to 10.78 [Member]
Options Outstanding \| shares	330,000
Remaining contractual Life (Years)	5 years 9 months 18 days
Shares Exercisable \| shares	330,000
Weighted Average Exercise Price	$ 10.67
Range of Exercise Prices, Lower Range Limit	10.54
Range of Exercise Prices, Upper Range Limit	$ 10.78
Range of Exercise Prices 10.97 to 15.99 [Member]
Options Outstanding \| shares	323,773
Remaining contractual Life (Years)	5 years 9 months 18 days
Shares Exercisable \| shares	163,538
Weighted Average Exercise Price	$ 13.42
Range of Exercise Prices, Lower Range Limit	10.97
Range of Exercise Prices, Upper Range Limit	$ 15.99
Range of Exercise Prices 22.65 to 28.69 [Member]
Options Outstanding \| shares	297,576
Remaining contractual Life (Years)	9 years 2 months 12 days
Shares Exercisable \| shares	23,562
Weighted Average Exercise Price	$ 22.65
Range of Exercise Prices, Lower Range Limit	22.65
Range of Exercise Prices, Upper Range Limit	$ 28.69

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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=96867065&loc=d3e5070-113901

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- Definition

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=96867065&loc=d3e5070-113901

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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- Definition

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=96867065&loc=d3e5070-113901

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- Definition

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=96867065&loc=d3e5070-113901

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