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Loans and Leases (Troubled Debt in Text) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 02, 2009
Elizabeth State Bank
Jul. 02, 2009
Impaired Purchased Loans
Elizabeth State Bank
Jul. 02, 2009
Nonimpaired Purchased Loans
Elizabeth State Bank
Dec. 31, 2012
Galena State Bank & Trust Co.
agreements
Dec. 31, 2012
Galena State Bank & Trust Co.
Residential Real Estate
Dec. 31, 2012
Galena State Bank & Trust Co.
Losses
Non-residential Real Estate
Dec. 31, 2012
Galena State Bank & Trust Co.
Recoveries
Non-residential Real Estate
Financing Receivable, Modifications [Line Items]              
Contractually required payments of loans acquired $ 42.7 $ 13.8 $ 28.9        
Estimated fair value of loans acquired 37.8 9.0 28.7        
Number of loss share agreements       2      
Shared loss arrangement, maximum covered assets       $ 10      
Loss sharing agreement, term         10 years 5 years 8 years