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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Derivatives (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
derivativeInstrument
riskParticipationAgreement
Dec. 31, 2022
USD ($)
derivativeInstrument
riskParticipationAgreement
Derivative [Line Items]    
Risk participation agreements with sold protection | riskParticipationAgreement 4 4
Interest rate swaps - balance sheet hedge | Designated as hedging instrument    
Derivative [Line Items]    
Number of derivatives | derivativeInstrument 2 2
Derivative, notional amount $ 125,000 $ 100,000
Interest rate swaps - balance sheet hedge | Designated as hedging instrument | Other liabilities    
Derivative [Line Items]    
Derivative liability 50,000 100,000
Interest rate swaps - balance sheet hedge | Designated as hedging instrument | Other assets    
Derivative [Line Items]    
Derivative asset 75,000  
Interest rate swaps - balance sheet hedge | Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Derivative, notional amount 319,500 268,800
Interest rate swaps - balance sheet hedge | Derivatives not designated as hedging instruments | Other liabilities    
Derivative [Line Items]    
Derivative liability 153,828 128,385
Interest rate swaps - balance sheet hedge | Derivatives not designated as hedging instruments | Other assets    
Derivative [Line Items]    
Derivative asset 153,828 128,385
Risk participation - sold protection | Derivatives not designated as hedging instruments | Other liabilities    
Derivative [Line Items]    
Derivative liability 32,588 29,019
Risk participation - purchased protection | Derivatives not designated as hedging instruments | Other assets    
Derivative [Line Items]    
Derivative asset 4,864 4,941
Interest rate lock commitments with customers | Derivatives not designated as hedging instruments | Other assets    
Derivative [Line Items]    
Derivative asset 593 1,356
Forward sale commitments | Derivatives not designated as hedging instruments | Other assets    
Derivative [Line Items]    
Derivative asset $ 150 $ 3,483