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ACCOUNTING POLICIES - The Company and Business Combinations and Divestitures Narrative (Details)
$ in Millions
9 Months Ended
Jun. 29, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
ATM
branch
Jul. 01, 2018
USD ($)
Apr. 01, 2018
USD ($)
Business Acquisition [Line Items]        
Number of branches | branch   140    
Number of ATM's | ATM   190    
Carrying value of assets managed     $ 400.0  
Loans sold $ 206.3      
DHFB        
Business Acquisition [Line Items]        
Carrying value of assets managed       $ 600.0
Outfitter Advisors Ltd.        
Business Acquisition [Line Items]        
Carrying value of assets managed     $ 400.0  
Shore Premier        
Business Acquisition [Line Items]        
Assets and liabilities sold 383.9      
Cash received $ 375.0      
Amount of shares received in transaction | shares 1,250,000      
Fair value of purchasing company's stock   $ 27.4    
Gain disposal of loans, net $ 15.8      
Xenith        
Business Acquisition [Line Items]        
Number of branches | branch   7