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SHORT-TERM BORROWINGS AND LONG-TERM DEBT - Subordinated Notes (Details) - USD ($)
Oct. 20, 2020
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Long-term debt   $ 105,495,000 $ 105,385,000
Subordinated notes | Notes      
Debt Instrument [Line Items]      
Subordinated notes   $ 55,000,000 $ 55,000,000
Stated interest rate, first five years 4.75% 0.0475%  
Debt face amount $ 55,000,000.0    
Debt instrument, term 10 years    
Long-term debt   $ 53,900,000  
Unamortized debt issuance costs   $ 1,100,000  
Subordinated notes | Notes | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 4.56%