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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
swap
customer
bank
broker
derivativeInstrument
Jun. 30, 2022
USD ($)
derivativeInstrument
swap
Jun. 30, 2023
USD ($)
derivativeInstrument
customer
bank
broker
Jun. 30, 2022
USD ($)
swap
derivativeInstrument
Dec. 31, 2022
USD ($)
derivativeInstrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of new interest rate swaps | bank 1   1    
Swap fee income $ 196,000 $ 785,000 $ 196,000 $ 1,738,000  
Cash collateral held by counterparty for derivatives 5,100,000   5,100,000   $ 5,400,000
Cash collateral held from counterparties 8,900,000   8,900,000   8,500,000
New risk participation agreements | derivativeInstrument   1   1  
Risk participation, upfront fee   $ 0   $ 0  
Interest rate derivative | Derivatives designated as hedging instruments:          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset 75,000,000   75,000,000    
Derivative, notional amount $ 175,000,000   $ 175,000,000   $ 100,000,000
Number of derivatives | derivativeInstrument 3   3   2
Interest rate derivative | Derivatives designated as hedging instruments: | Other liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability $ 100,000,000   $ 100,000,000   $ 100,000,000
Interest rate derivative | Derivatives designated as hedging instruments: | Other assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset 75,000,000   75,000,000    
Interest rate derivative | Derivatives not designated as hedging instruments:          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, notional amount $ 280,400,000   $ 280,400,000   268,800,000
Number of customers | customer 27   27    
Third-party broker | broker 27   27    
Interest rate derivative | Derivatives not designated as hedging instruments: | Other liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability $ 134,230,000   $ 134,230,000   128,385,000
Interest rate derivative | Derivatives not designated as hedging instruments: | Other assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset 134,230,000   134,230,000   128,385,000
Risk participation - sold protection | Derivatives not designated as hedging instruments: | Other liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability $ 32,312,000   32,312,000   29,019,000
Interest rate swap          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of new interest rate swaps | swap 2 2   5  
Swap fee income $ 196,000 $ 785,000   $ 1,700,000  
Risk participation - purchased protection | Derivatives not designated as hedging instruments: | Other assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset $ 4,890,000   $ 4,890,000   $ 4,941,000