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SUBORDINATED DEBENTURES (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2017
Feb. 01, 2021
Dec. 31, 2020
Debt Instrument [Line Items]                
Fixed-to-floating rate subordinated debentures $ 80.0              
Subordinated notes payable, net   $ 197.1   $ 197.1       $ 114.1
Interest expense related to the subordinated debt   $ 2.2 $ 1.3 $ 6.3 $ 4.0      
Subordinated Debentures                
Debt Instrument [Line Items]                
Fixed-to-floating rate subordinated debentures           $ 115.0 $ 115.0  
Fixed annual interest rate           4.50% 4.50%  
Basis points           2.66%    
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 0.0525%              
Debt instrument variable rate description three-month LIBOR              
Basis points 3.60%              
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 0.0575%              
Debt instrument variable rate description three-month LIBOR              
Basis points 3.45%