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Earnings Per Share (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2013
Income (Numerator) [Abstract]                        
Net income as reported $ 3,229,000 $ 3,223,000 $ 3,323,000 $ 2,913,000 $ 3,022,000 $ 3,006,000 $ 3,193,000 $ 3,143,000 $ 12,688,000 $ 12,364,000 $ 12,116,000  
Less dividends and amortization of premium on preferred stock                 723,000 1,208,000 1,348,000  
Basic EPS: Income available to common shareholders                 11,965,000 11,156,000 10,768,000  
Diluted EPS: Income available to common shareholders plus assumed conversions                 $ 11,965,000 $ 11,156,000 $ 10,768,000  
Shares (Denominator) [Abstract]                        
Weighted average number of common shares outstanding                 9,828,925 9,788,610 9,760,760  
Incremental shares                 17,606 9,619 4,726  
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)                 9,846,531 9,798,229 9,765,486  
Per-Share Amount [Abstract]                        
Basic EPS: Income available to common shareholders (in dollars per share) $ 0.31 $ 0.31 $ 0.32 $ 0.28 $ 0.29 $ 0.27 $ 0.29 $ 0.29 $ 1.22 $ 1.14 $ 1.10  
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) $ 0.31 $ 0.31 $ 0.32 $ 0.28 $ 0.29 $ 0.27 $ 0.29 $ 0.29 $ 1.22 $ 1.14 $ 1.10  
Schedule of Outstanding Options And Warrants [Line Items]                        
Incentive stock options (in shares) 42,000       51,000       42,000 51,000 55,500  
Warrants issued to U.S. Treasury (in shares) 225,904       225,904       225,904 225,904 225,904 225,904
Total dilutive securities (in shares) 267,904       276,904       267,904 276,904 281,404  
In-the-Money [Member]
                        
Schedule of Outstanding Options And Warrants [Line Items]                        
Incentive stock options (in shares) 0       9,000       0 9,000 13,500  
Warrants issued to U.S. Treasury (in shares) 0       0       0 0 0  
Total dilutive securities (in shares) 0       9,000       0 9,000 13,500  
Out-of-the-Money [Member]
                        
Schedule of Outstanding Options And Warrants [Line Items]                        
Incentive stock options (in shares) 42,000       42,000       42,000 42,000 42,000  
Warrants issued to U.S. Treasury (in shares) 225,904       225,904       225,904 225,904 225,904  
Total dilutive securities (in shares) 267,904       267,904       267,904 267,904 267,904