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Stock-Based Compensation Plan (Restricted Stock Activity) (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Stock incentive plan, authorized common stock 300,000  
Shares, Nonvested, beginning of period 13,700 12,772
Shares, Granted 14,500 12,300
Shares, Vested (7,363) (5,691)
Shares, Forfeited (737) (2,081)
Shares, Nonvested, end of period 20,100 17,300
Weighted Average Grant Date Fair Value, Nonvested, beginning of period $ 16.11 $ 16.89
Weighted Average Grant Date Fair Value, Granted $ 17.87 $ 16.76
Weighted Average Grant Date Fair Value, Vested $ 16.10 $ 17.26
Weighted Average Grant Date Fair Value, Forfeited $ 16.25 $ 18.38
Weighted Average Grant Date Fair Value, Nonvested, end of period $ 17.37 $ 16.50
Outside Directors [Member]
    
Vesting service period of grants to executive officers 9 months  
Executive Officers [Member]
    
Vesting service period of grants to executive officers 3 years