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DERIVATIVES FINANCIAL INSTRUMENTS - Narrative (Details)
 3 Months Ended
Jun. 30, 2021
USD ($)
bank
Dec. 31, 2020
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Cash collateral held by counterparty for derivatives $ 690,000 $ 1,700,000
Interest rate derivative    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative, notional amount $ 50,000,000.0  
Interest rate derivative | Designated as hedging instrument    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Number of derivatives | bank 1  
Interest rate derivative | Derivatives not designated as hedging instruments:    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Number of derivatives | bank 10  
Derivative, notional amount $ 64,600,000 61,300,000
Number of customers | bank 10  
Interest rate derivative | Derivatives not designated as hedging instruments: | Other liabilities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative liabilities $ 32,304,000 30,673,000
Interest rate derivative | Derivatives not designated as hedging instruments: | Agent Bank    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Upfront fee from derivative 53,000  
Interest rate derivative | Derivatives not designated as hedging instruments: | Agent Bank | Other liabilities    
Derivative Instruments and Hedging Activities Disclosures [Line Items]    
Derivative liabilities $ 15,900,000 $ 0