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Cash and Due from Banks (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Cash and Cash Equivalents [Abstract]    
Average reserve deposited with the Board of Governors of the Federal Reserve Bank $ 5.5 $ 5.1
Interest-bearing balances due from banks $ 32.2 $ 41.6