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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
bank
customer
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
bank
Sep. 30, 2021
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Third-party broker | bank 14      
Swap fee income $ 953,000 $ 53,000    
Cash collateral held by counterparty for derivatives 0   $ 260,000  
Cash collateral held from counterparties $ 2,600,000   $ 490,000  
Interest rate derivative        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Number of derivatives | bank 0   0  
Swap fee income $ 953,000 $ 0    
Interest rate derivative | Designated as hedging instrument        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount       $ 50,000,000
Interest rate derivative | Derivatives not designated as hedging instruments:        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Number of customers | customer 14      
Derivative, notional amount $ 120,600,000   $ 75,800,000  
Interest rate derivative | Derivatives not designated as hedging instruments: | Other Liabilities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount 60,279,000   37,915,000  
Risk participation agreement | Agent Bank        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Upfront fee from derivative     53,000  
Risk participation agreement | Derivatives not designated as hedging instruments: | Other Liabilities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount 15,855,000   15,855,000  
Risk participation agreement | Derivatives not designated as hedging instruments: | Agent Bank | Other Liabilities        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Notional amount $ 15,900,000   $ 15,900,000