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Stock Incentive Plan Summary of Unvested Stock and Stock Units (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Other than Options, Nonvested, Number 25,337 15,096 0
Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 22.16 $ 18.70 $ 0.00
Other than Options, Grants in Period 15,162 17,409  
Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 25.50 $ 18.70  
Other than Options, Vested in Period (4,179) (2,313)  
Other than Options, Vested in Period, Weighted Average Grant Date Fair Value $ 21.84 $ 18.70  
Other than Options, Forfeited in Period (742) 0  
Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 21.87 $ 0.00  
Other than Options, Vested in Period, Total Fair Value $ 91,259 $ 42,675  
Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options $ 400,000 $ 216,000