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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Commitment To Extend Credit and Unused Lines of Credit [Member]
   
Guarantor Obligations [Line Items]    
Commitments - maximum potential obligation $ 861.7 $ 764.9
Standby Letters of Credit [Member]
   
Guarantor Obligations [Line Items]    
Commitments - maximum potential obligation 33.0 26.8
Obligation instrument term (in years) 5Y  
Commercial Letters of Credit [Member]
   
Guarantor Obligations [Line Items]    
Commitments - maximum potential obligation $ 8.3 $ 15.2