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Business Acquisitions and Divestitures (Details) - Fairview Heights, Aviston and St. Rose, Illinois
$ in Millions
Jun. 17, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Deposits $ 51.7
Loans 13.1
Fixed assets 5.1
Net gain $ 1.1