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Cash and Due from Banks (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Cash and Cash Equivalents [Abstract]    
Average reserve deposited with the Board of Governors of the Federal Reserve Bank $ 4.6 $ 5.5
Interest-bearing deposits in other banks $ 41.4 $ 32.2