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INVESTMENT SECURITIES - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items]        
Transfer of securities from available-for-sale to held-to-maturity $ 58,700,000      
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, Held-To-Maturity Carrying Value, Pledged As Collateral   $ 51,600,000 $ 22,600,000  
Shareholder equity held by one issuer (as a percent)   10.00% 10.00%  
Accrued interest receivable   $ 10,976,000 $ 10,445,000  
Securities sold   0 0  
Bank Technology Fund        
Debt Securities, Available-for-sale [Line Items]        
Contractual obligation       $ 6,000,000
Payments to partnership fund   300,000    
Balance with SBIC included in other assets   1,600,000    
Committed investments to be made in the future   4,400,000    
Debt Securities, Held-To-Maturity Carrying Value, Pledged As Collateral   29,400,000    
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    
Return of capital, received   100,000 100,000  
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 $ 2,000,000  
Held-to-Maturity Securities        
Debt Securities, Available-for-sale [Line Items]        
Accrued interest receivable   $ 500,000