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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
derivativeInstrument
customer
swap
broker
Sep. 30, 2022
USD ($)
swap
derivativeInstrument
Sep. 30, 2023
USD ($)
swap
derivativeInstrument
customer
bank
broker
Sep. 30, 2022
USD ($)
derivativeInstrument
swap
Dec. 31, 2022
USD ($)
derivativeInstrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Swap fee income $ 255,000 $ 197,000 $ 451,000 $ 1,935,000  
Cash collateral held by counterparty for derivatives 9,700,000   9,700,000   $ 5,400,000
Cash collateral held from counterparties $ 16,100,000   $ 16,100,000   8,500,000
New risk participation agreements | derivativeInstrument 0 1 0 1  
Risk participation, upfront fee   $ 0   $ 0  
New interest rate derivative | Derivatives designated as hedging instruments:          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of new interest rate swaps | bank     1    
Derivative, notional amount $ 75,000,000   $ 75,000,000    
Interest rate derivative | Derivatives designated as hedging instruments:          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, notional amount $ 125,000,000   $ 125,000,000   $ 100,000,000
Number of derivatives | derivativeInstrument 2   2   2
Interest rate derivative | Derivatives designated as hedging instruments: | Other liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability $ 50,000,000   $ 50,000,000   $ 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 $ 319,500,000   $ 319,500,000   268,800,000
Number of customers | customer 31   31    
Third-party broker | broker 31   31    
Interest rate derivative | Derivatives not designated as hedging instruments: | Other liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability $ 153,828,000   $ 153,828,000   128,385,000
Interest rate derivative | Derivatives not designated as hedging instruments: | Other assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset $ 153,828,000   $ 153,828,000   128,385,000
Interest rate swap          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of new interest rate swaps | swap 4 4 6 9  
Swap fee income $ 255,000 $ 197,000 $ 451,000 $ 1,900,000  
Interest rate swap | Derivatives designated as hedging instruments:          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Number of derivatives to mature | derivativeInstrument 1   1    
Derivative asset $ 50,000,000   $ 50,000,000    
Risk participation - sold protection | Derivatives not designated as hedging instruments: | Other liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability 32,588,000   32,588,000   29,019,000
Risk participation - purchased protection | Derivatives not designated as hedging instruments: | Other assets          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset $ 4,864,000   $ 4,864,000   $ 4,941,000