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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