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Share-Based Compensation Plans (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Summary of activity for Corporation's stock options  
Weighted average per share fair value $ 7.08
Non Vested [Member]
 
Summary of activity for Corporation's stock options  
Outstanding at January 1, 2012, Number of Options 162,883
Outstanding at January 1, 2012, Weighted Average Exercise Price $ 21.27
Outstanding at January 1, 2012, Weighted average grant date fair value $ 6.55
Granted 229,763
Granted, Weighted Average Exercise Price $ 23.78
Weighted average per share fair value $ 7.08
Exercised   
Exercised, Weighted Average Exercise Price   
Exercised, Weighted Average Grant Date Fair Value   
Vested (75,150)
Vested, Weighted Average Exercise Price $ 21.51
Vested, Weighted Average Grant Date Fair Value $ 6.62
Forfeited/expired (1,522)
Forfeited/expired, Weighted Average Exercise Price $ 20.97
Forfeited/expired, Weighted Average Grant Date Fair Value $ 6.44
Outstanding at June 30, 2012, Number of Options 315,974
Outstanding at June 30, 2012, Weighted Average Exercise Price $ 23.04
Outstanding at June 30, 2012, Weighted average grant date fair value $ 6.92
Vested [Member]
 
Summary of activity for Corporation's stock options  
Outstanding at January 1, 2012, Number of Options 815,119
Outstanding at January 1, 2012, Weighted Average Exercise Price $ 28.29
Granted 229,763
Granted, Weighted Average Exercise Price $ 23.78
Exercised   
Exercised, Weighted Average Exercise Price   
Forfeited/expired (16,713)
Forfeited/expired, Weighted Average Exercise Price $ 30.33
Outstanding at June 30, 2012, Number of Options 1,028,169
Outstanding at June 30, 2012, Weighted Average Exercise Price $ 27.25
Exercisable/vested at June 30, 2012, Number of Options 712,195
Exercisable/vested at June 30, 2012, Weighted Average Exercise Price $ 29.12