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Nature of Operations and Summary of Significant Accounting Policies Adoption of ASU No. 2016-09 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summary of ASU No. 2016-09 Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) | $ (1,199) | $ 3,020 | $ (1,621) | $ (2,356) | $ (2,185) | $ (2,060) | $ (1,962) | $ (2,170) | $ 2,156 | $ 8,377 | $ 7,083
Net income | $ 3,968 | $ 2,665 | $ 3,723 | $ 4,553 | $ 4,083 | $ 4,381 | $ 3,858 | $ 4,192 | $ 14,909 | $ 16,514 | $ 14,139
Effective Income Tax Rate Reconciliation, Percent |  |  |  |  |  |  |  |  | 12.63% | 33.65% | 33.38%
Basic earnings per common share | $ 0.46 | $ 0.31 | $ 0.43 | $ 0.52 | $ 0.47 | $ 0.50 | $ 0.45 | $ 0.48 | $ 1.71 | $ 1.90 | $ 1.76
Diluted earnings per common share | $ 0.46 | $ 0.31 | $ 0.43 | $ 0.52 | $ 0.47 | $ 0.50 | $ 0.45 | $ 0.48 | $ 1.71 | $ 1.90 | $ 1.75
Additional Paid in Capital, Common Stock | $ 77,542 |  |  |  | $ 76,549 |  |  |  | $ 77,542 | $ 76,549 |
Retained Earnings (Accumulated Deficit) | $ 91,317 |  |  |  | $ 80,584 |  |  |  | $ 91,317 | $ 80,584 |
As Reported |  |  |  |  |  |  |  |  |  |  |
Summary of ASU No. 2016-09 Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  | $ (2,895) | $ 1,628 | $ 2,362 |  |  |  |  |  |  |
Net income |  | $ 2,540 | $ 3,716 | $ 4,547 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 30.50% | 34.20% |  |  |  |  |  |  |
Basic earnings per common share |  | $ 290 | $ 430 | $ 520 |  |  |  |  |  |  |
Diluted earnings per common share |  | $ 290 | $ 430 | $ 520 |  |  |  |  |  |  |
Additional Paid in Capital, Common Stock |  | $ 77,544 | $ 77,127 | $ 76,851 |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ 88,255 | $ 86,760 | $ 84,089 |  |  |  |  |  |  |
Ratio of Annualized Net Income to Average Assets |  | 0.56% | 0.81% | 1.00% |  |  |  |  |  |  |
Ratio of Annualized Net Income to Average Equity |  | 6.38% | 9.43% | 11.68% |  |  |  |  |  |  |
As Adjusted |  |  |  |  |  |  |  |  |  |  |
Summary of ASU No. 2016-09 Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit) |  | $ (3,020) | $ 1,621 | $ 2,356 |  |  |  |  |  |  |
Net income |  | $ 2,665 | $ 3,723 | $ 4,553 |  |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 30.30% | 34.10% |  |  |  |  |  |  |
Basic earnings per common share |  | $ 310 | $ 430 | $ 520 |  |  |  |  |  |  |
Diluted earnings per common share |  | $ 310 | $ 430 | $ 520 |  |  |  |  |  |  |
Additional Paid in Capital, Common Stock |  | $ 77,419 | $ 77,120 | $ 76,845 |  |  |  |  |  |  |
Retained Earnings (Accumulated Deficit) |  | $ 88,380 | $ 86,767 | $ 84,095 |  |  |  |  |  |  |
Ratio of Annualized Net Income to Average Assets |  | 0.59% | 0.82% | 1.00% |  |  |  |  |  |  |
Ratio of Annualized Net Income to Average Equity |  | 6.69% | 9.45% | 11.70% |  |  |  |  |  |  |

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