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SUBORDINATED DEBENTURES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2017
Dec. 31, 2020
Debt Instrument [Line Items]          
Fixed-to-floating rate subordinated debentures $ 80.0        
Subordinated notes payable, net   $ 197.2     $ 114.1
Interest expense related to the subordinated debt   $ 1.9 $ 1.3    
Subordinated Debentures          
Debt Instrument [Line Items]          
Fixed-to-floating rate subordinated debentures       $ 115.0  
Fixed annual interest rate       4.50%  
Basis points       266.00%  
Callable Notes After Five Years | Subordinated Debentures          
Debt Instrument [Line Items]          
Fixed-to-floating rate subordinated debentures $ 40.0        
Debt Instrument, Term 5 years        
Fixed annual interest rate 5.25%        
Debt instrument variable rate description three-month LIBOR        
Basis points 360.00%        
Callable Notes After Ten Years | Subordinated Debentures          
Debt Instrument [Line Items]          
Fixed-to-floating rate subordinated debentures $ 40.0        
Debt Instrument, Term 10 years        
Fixed annual interest rate 5.75%        
Debt instrument variable rate description three-month LIBOR        
Basis points 345.00%