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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Derivatives (Details)
Sep. 30, 2022
USD ($)
derivativeInstrument
Dec. 31, 2021
USD ($)
derivativeInstrument
Sep. 30, 2021
USD ($)
Interest rate products | Designated as hedging instrument      
Derivative [Line Items]      
Number of derivatives | derivativeInstrument 2 0  
Derivative, notional amount $ 100,000,000    
Derivative liabilities   $ 0 $ 50,000,000
Interest rate products | Derivatives not designated as hedging instruments      
Derivative [Line Items]      
Derivative, notional amount 206,400,000 75,800,000  
Interest rate products | Derivatives not designated as hedging instruments | Other assets      
Derivative [Line Items]      
Derivative asset 103,206,000 37,915,000  
Risk participation agreements      
Derivative [Line Items]      
Derivative liabilities 15,900,000 15,900,000  
Derivative asset 5,000,000 $ 0  
Risk participation agreements | Derivatives not designated as hedging instruments | Other assets      
Derivative [Line Items]      
Derivative asset $ 4,966,000