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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement [Abstract] |  |  |
Percentage of fair value at purchase date | 85.00% |  |
Discount from market price, purchase date | 15.00% |  |
ESPP shares purchased | 194,485 | 136,576 | 110,200
Average purchase price per share (85% of market value) | $ 10.02 | $ 14.03 | $ 14.74
Compensation expense recognized (in thousands) | $ 344 | $ 338 | $ 287

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