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Off-Balance Sheet Credit Risk (Details) (USD $)
In Millions
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2010
Fair value of securities accepted as collateral permitted to sell or repledge   $ 864.7 $ 950.6
Fair value of collateral securities sold or repledged 67.6 109.6 42.5
Letters of credit outstanding 9.2 9.2  
Loan Origination Commitments [Member]
     
Outstanding commitments to originate loans 114.7 107.2  
Unused lines of Credit [Member]
     
Unused lines of credit to commercial and consumer borrowers $ 91.1 $ 97.4