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Employee Benefit Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Defined contribution maximum annual matching contribution per employee, percent	3.00%
Defined contribution maximum annual discretionary contribution per employee, percent	6.00%
Defined contribution plan, employer matching contribution, percent	3.00%
Defined contribution plan employer matching contribution	$ 626	$ 621	$ 573
Defined contribution plan employer discretionary contribution percent	1.00%	1.20%	3.30%
Defined contribution plan, employer discretionary contribution amount	$ 183	$ 207	$ 549
Deferred compensation plan compensation expense	132	124	$ 116
Present value of future payments under the remaining deferred compensation plan liability	$ 1,100	$ 987

X

- Definition

Defined Contribution Maximum Annual Discretionary Contribution Per Employee, Percent

+ References

No definition available.

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- Definition

Defined Contribution Maximum Annual Matching Contribution Per Employee, Percent

+ References

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- Definition

Defined Contribution Plan Employer Discretionary Contribution Percent

+ References

No definition available.

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- Definition

Defined Contribution Plan Employer Matching Contribution, Amount

+ References

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

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