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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
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 | May 31, 2015 | Jan. 09, 2009
Income (Numerator) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Net income as reported | $ 4,320 | $ 4,562 | $ 4,624 | $ 4,503 | $ 3,769 | $ 4,188 | $ 4,074 | $ 4,175 | $ 18,009 | $ 16,206 | $ 14,709 |  |
Basic EPS: Income available to common shareholders |  |  |  |  |  |  |  |  | 18,009 | 16,206 | 14,709 |  |
Diluted EPS: Income available to common shareholders plus assumed conversions |  |  |  |  |  |  |  |  | $ 18,009 | $ 16,206 | $ 14,709 |  |
Shares (Denominator) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 10,713,290 | 10,674,755 | 10,638,527 |  |
Incremental shares (in shares) |  |  |  |  |  |  |  |  | 116,512 | 90,114 | 72,337 |  |
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares) |  |  |  |  |  |  |  |  | 10,829,802 | 10,764,869 | 10,710,864 |  |
Per-Share Amount [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |
Basic EPS: Income available to common shareholders (in dollars per share) | $ 0.40 | $ 0.43 | $ 0.43 | $ 0.42 | $ 0.36 | $ 0.39 | $ 0.38 | $ 0.39 | $ 1.68 | $ 1.52 | $ 1.38 |  |
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) | $ 0.39 | $ 0.42 | $ 0.43 | $ 0.42 | $ 0.35 | $ 0.39 | $ 0.38 | $ 0.39 | $ 1.66 | $ 1.51 | $ 1.37 |  |
Schedule of Outstanding Options And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive stock options | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 42,000 |  |
Warrants issued to private parties | 0 |  |  |  | 226,819 |  |  |  | 0 | 226,819 | 225,904 | 226,819 | 225,904
Total Dilutive Securities | 0 |  |  |  | 226,819 |  |  |  | 0 | 226,819 | 267,904 |  |
In-the-Money |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Outstanding Options And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive stock options | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |
Warrants issued to private parties | 0 |  |  |  | 226,819 |  |  |  | 0 | 226,819 | 225,904 |  |
Total Dilutive Securities | 0 |  |  |  | 226,819 |  |  |  | 0 | 226,819 | 225,904 |  |
Out-of-the-Money |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Outstanding Options And Warrants [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Incentive stock options | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 42,000 |  |
Warrants issued to private parties | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 0 |  |
Total Dilutive Securities | 0 |  |  |  | 0 |  |  |  | 0 | 0 | 42,000 |  |

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