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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2022
Jun. 30, 2023
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]          
Transfer of securities from available-for-sale to held-to-maturity $ 58,700,000   $ 0 $ 58,727,000  
Unrealized loss on transfer of securities from available-for-sale to held-to-maturity 2,300,000        
Gain (loss) recognized at the time of transfer $ 0        
Debt securities pledged as collateral   $ 48,400,000 $ 48,400,000   $ 22,600,000
Shareholder equity held by one issuer (as a percent)     10.00%   10.00%
Securities sold   0 $ 0   $ 0
Accrued interest receivable   11,135,000 11,135,000   10,445,000
Bank Technology Fund          
Debt Securities, Available-for-sale [Line Items]          
Contractual obligation         6,000,000
Payments to partnership fund     400,000    
Balance with SBIC included in other assets   1,700,000 1,700,000    
Committed investments to be made in the future     4,300,000    
Debt securities pledged as collateral   47,300,000 47,300,000    
Bank Technology Fund | Other Assets          
Debt Securities, Available-for-sale [Line Items]          
Contribution to committed investments         1,300,000
Small Business Investment Company ("SBIC")          
Debt Securities, Available-for-sale [Line Items]          
Contractual obligation   800,000 800,000    
Return of capital, received         100,000
Small Business Investment Company ("SBIC") | Other Assets          
Debt Securities, Available-for-sale [Line Items]          
Contribution to committed investments     200,000    
Balance with SBIC included in other assets   2,200,000 2,200,000   $ 2,000,000
Held-to-Maturity Securities          
Debt Securities, Available-for-sale [Line Items]          
Accrued interest receivable   $ 300,000 $ 300,000