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Employee Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Contribution Plan [Line Items]
Matched percentage by employer	50.00%
Maximum employee percentage of deferred salary matched by employer	6.00%
Non-elective safe-harbor contribution received each December 31st	3.00%
Employer contributions	$ 1,000	$ 990	$ 956
Maximum age benefit could be reduced or forfeited	65 years
Supplemental income benefit liability	$ 56	64
Supplemental income benefit expense	$ 29	$ 29	$ 29
Minimum [Member]
Defined Contribution Plan [Line Items]
Non-elective safe-harbor contribution received each December 31st	1.00%
Maximum [Member]
Defined Contribution Plan [Line Items]
Non-elective safe-harbor contribution received each December 31st	10.00%

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[Line Items] for Defined Contribution Plan [Table]

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Executive Supplemental Income Benefit Expense

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Maximum Age Benefits Can Be Reduced Or Forfeited Due To Employment Termination

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(ii)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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