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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 | 121,890 | 132,640 | 141,608
Average purchase price per share (85% of market value) | $ 10.86 | $ 10.31 | $ 10.02
Compensation expense recognized (in thousands) | $ 234 | $ 241 | $ 251

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