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Stock-Based Compensation Plans ESPP (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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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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