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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 09, 2009
Income (Numerator) [Abstract]                        
Net income as reported $ 3,769 $ 4,188 $ 4,074 $ 4,175 $ 3,426 $ 4,108 $ 3,747 $ 3,428 $ 16,206 $ 14,709 $ 12,965  
Less dividends and amortization of premium on preferred stock                     384  
Basic EPS: Income available to common shareholders                 16,206 14,709 12,581  
Diluted EPS: Income available to common shareholders plus assumed conversions                 $ 16,206 $ 14,709 $ 12,581  
Shares (Denominator) [Abstract]                        
Weighted average number of common shares outstanding                 10,674,755 10,638,527 10,469,446  
Incremental shares                 90,114 72,337 51,609  
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)                 10,764,869 10,710,864 10,521,055  
Per-Share Amount [Abstract]                        
Basic EPS: Income available to common shareholders (in dollars per share) $ 0.36 $ 0.39 $ 0.38 $ 0.39 $ 0.32 $ 0.39 $ 0.35 $ 0.32 $ 1.52 $ 1.38 $ 1.20  
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) $ 0.35 $ 0.39 $ 0.38 $ 0.39 $ 0.32 $ 0.38 $ 0.35 $ 0.32 $ 1.51 $ 1.37 $ 1.20  
Schedule of Outstanding Options And Warrants [Line Items]                        
Incentive stock options 0       42,000       0 42,000 42,000  
Warrants to private parties 226,819       225,904       226,819 225,904 225,904 225,904
Total Dilutive Securities 226,819       267,904       226,819 267,904 267,904  
In-the-Money                        
Schedule of Outstanding Options And Warrants [Line Items]                        
Incentive stock options 0       0       0 0 0  
Warrants to private parties 226,819       225,904       226,819 225,904 225,904  
Total Dilutive Securities 226,819       225,904       226,819 225,904 225,904  
Out-of-the-Money                        
Schedule of Outstanding Options And Warrants [Line Items]                        
Incentive stock options 0       42,000       0 42,000 42,000  
Warrants to private parties 0       0       0 0 0  
Total Dilutive Securities 0       42,000       0 42,000 42,000