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BORROWING ARRANGEMENTS, Subordinated Debt Securities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Sep. 29, 2020
Dec. 31, 2018
Subordinated Debt Securities [Abstract]        
Subordinated debt securities $ 75,728 $ 75,589    
Subordinated Debt Securities Issued in December 2018 [Member]        
Subordinated Debt Securities [Abstract]        
Debt instrument, face amount       $ 26,500
Subordinated Debt Securities Issued in December 2018 [Member] | Debt Securities One [Member]        
Subordinated Debt Securities [Abstract]        
Debt instrument, face amount       $ 12,400
Debt instrument, maturity date Dec. 31, 2028      
Debt instrument, initial interest rate       5.74%
Debt instrument, period of fixed interest rate 5 years      
Debt instrument, variable interest rate, floor 4.50%      
Debt instrument, variable interest rate, ceiling 7.50%      
Subordinated Debt Securities Issued in December 2018 [Member] | Debt Securities One [Member] | Maximum [Member]        
Subordinated Debt Securities [Abstract]        
Remaining maturity period during which debt can be called 5 years      
Subordinated Debt Securities Issued in December 2018 [Member] | Debt Securities Two [Member]        
Subordinated Debt Securities [Abstract]        
Debt instrument, face amount       $ 14,100
Debt instrument, maturity date Dec. 31, 2030      
Debt instrument, initial interest rate       6.41%
Debt instrument, period of fixed interest rate 7 years      
Debt instrument, variable interest rate, floor 4.50%      
Debt instrument, variable interest rate, ceiling 7.50%      
Subordinated Debt Securities Issued in December 2018 [Member] | Debt Securities Two [Member] | Maximum [Member]        
Subordinated Debt Securities [Abstract]        
Remaining maturity period during which debt can be called 5 years      
Subordinated Debt Securities Issued in September 29, 2020 [Member]        
Subordinated Debt Securities [Abstract]        
Debt instrument, face amount     $ 50,000  
Debt issuance cost     $ 926  
Debt instrument, maturity date Sep. 30, 2030      
Debt instrument, initial interest rate     4.50%  
Debt instrument, period of fixed interest rate 5 years      
Subordinated Debt Securities Issued in September 29, 2020 [Member] | SOFR [Member]        
Subordinated Debt Securities [Abstract]        
Term of variable rate 3 months      
Basis spread on variable rate 4.38%      
Subordinated Debt Securities Issued in September 29, 2020 [Member] | Maximum [Member]        
Subordinated Debt Securities [Abstract]        
Remaining maturity period during which debt can be called 5 years      
Subordinated Debt [Member]        
Subordinated Debt Securities [Abstract]        
Debt instrument, face amount $ 76,500      
Debt issuance cost 744      
Subordinated debt securities $ 75,700