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LOANS (Carrying amount of loans acquired narrative) (Details) - USD ($)
$ in Millions
Nov. 30, 2019
May 10, 2019
Rockford Bank And Trust Company    
Business Acquisition [Line Items]    
Estimated fair value of loans acquired $ 366.6  
Loans held to maturity $ 354.0  
Blue Valley Ban Corp.    
Business Acquisition [Line Items]    
Estimated fair value of loans acquired   $ 558.2
Loans held to maturity   $ 542.0