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Off-Balance Sheet Credit Risk (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair value of securities accepted as collateral permitted to sell or repledge $ 965.8 $ 1,000.0
Fair value of collateral securities sold or repledged 140.3 80.2
Outstanding commitments to originate loans 241.5 141.0
Letters of credit outstanding 10.5 9.2
Unused lines of Credit [Member]
   
Unused lines of credit to commercial and consumer borrowers $ 220.1 $ 102.4