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Loans and Allowance for Loan Losses (Loans Pledged) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Loans Receivable, Net [Abstract]    
Loans pledged to collateralize FHLB advances and letters of credit $ 270.2 $ 339.4
Credit availability for borrowing under FHLB advances and letters of credit 19.1 69.5
Loans pledged to collateralize potential borrowings 36.5  
Securities pledged to collateralize potential borrowings 4.0  
Available borrowing capacity. $ 22.3