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LOANS - Troubled Debt Restructurings (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2017
item
Dec. 31, 2019
USD ($)
item
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Troubled debt restructurings        
Troubled debt restructurings during the period | item   1    
TDR modifications   $ 2.0 $ 0.0  
Recorded investment of troubled debt restructurings   20.0 22.0  
Recorded investment of troubled debt restructurings that were nonaccruing   $ 5.0 $ 4.3  
Number of troubled debt restructurings that defaulted   0.0 0.0 0.0
Minimum        
Troubled debt restructurings        
Payment in arrears before considered in default | item   2    
Commercial        
Troubled debt restructurings        
Troubled debt restructurings during the period | item 2