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Loans (Pledged Assets) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Loans Receivable, Net [Abstract]    
Loans pledged to collateralize FHLB advances and letters of credit $ 309.9 $ 339.4
Credit availability for borrowing under FHLB advances and letters of credit 58.0 69.5
Loans pledged to collateralize potential borrowings from Federal Reserve Discount Window 46.0  
Securities pledged to collateralized potential borrowings from Federal Reserve Discount Window 4.1  
Borrowing capacity under Federal Reserve Discount Window $ 29.0