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Earnings Per Share (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Income (Numerator) [Abstract]      
Net income as reported $ 2,913,000 $ 3,143,000  
Less dividends and amortization of premium on preferred stock 181,000 337,000  
Basic EPS: Income available to common shareholders 2,732,000 2,806,000  
Diluted EPS: Income available to common shareholders plus assumed conversions $ 2,732,000 $ 2,806,000  
Shares (Denominator) [Abstract]      
Weighted average number of common shares outstanding 9,817,029 9,778,756  
Incremental shares 11,196 8,527  
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares) 9,828,225 9,787,283  
Per-Share Amount [Abstract]      
Basic EPS: Income available to common shareholders (in dollars per share) $ 0.28 $ 0.29  
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share) $ 0.28 $ 0.29  
Schedule of Outstanding Options And Warrants [Line Items]      
Incentive stock options (in shares) 42,000 13,500 51,000
Warrants issued to U.S. Treasury (in shares) 225,904 225,904  
Total dilutive securities (in shares) 0 281,404