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Loans and Leases (Troubled debt in text) (Details) (USD $)
In Millions, unless otherwise specified
6 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
Jun. 30, 2013
Galena State Bank & Trust Co.
agreements
Jun. 30, 2013
Non-residential Real Estate
Losses
Galena State Bank & Trust Co.
Jun. 30, 2013
Non-residential Real Estate
Recoveries
Galena State Bank & Trust Co.
Jun. 30, 2013
Residential Real Estate
Galena State Bank & Trust Co.
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         5 years 8 years 10 years