Employee Benefits and Stock Compensation - Summary of Unrecognized Compensation Cost (Details) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($)
Unrecognized Compensation Cost	$ 7,160
Weighted-Average Period Remaining (Years)	1 year 9 months 18 days
Stock options [Member]
Unrecognized Compensation Cost	$ 1,374
Weighted-Average Period Remaining (Years)	2 years 4 months 24 days
Restricted Stock [Member]
Unrecognized Compensation Cost	$ 2,383
Weighted-Average Period Remaining (Years)	1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Unrecognized Compensation Cost	$ 3,403
Weighted-Average Period Remaining (Years)	1 year 8 months 12 days

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.

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

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