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Stock-Based Compensation Plans ESPP (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Percentage of fair value at purchase date	85.00%
Discount from market price, purchase date	15.00%
ESPP shares purchased	98,000	109,665	121,890
Average purchase price per share (85% of market value)	$ 15.28	$ 12.37	$ 10.86
Compensation expense recognized (in thousands)	$ 261	$ 240	$ 234

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Employee Stock Purchase Plan Average Purchase Price Per Share

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Share Based Compensation Arrangement By Share Based Payment Award Percentage Of Fair Value At Purchase Date

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The amount of plan compensation cost recognized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 40
-Section 50
-Paragraph 1
-Subparagraph (c)
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Discount rate from fair value on purchase date that participants pay for shares.

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-Publisher FASB
-Name Accounting Standards Codification
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Number of shares issued during the period as a result of an employee stock purchase plan.

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