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FAIR VALUE - Narrative (Details)
3 Months Ended 9 Months Ended
Dec. 23, 2022
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
security
Sep. 30, 2023
USD ($)
security
Sep. 30, 2022
USD ($)
security
Dec. 31, 2022
USD ($)
security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value option, aggregate fair value declined (below) principal amount   $ 1,400,000   $ 1,400,000   $ 1,200,000
Increase (decrease) in fair value       14,924,000 $ 72,247,000  
Decrease (increase) loans evaluated for credit loss   (224,000) $ 0 286,000 $ (40,000)  
Impairment reserve for mortgage servicing rights   0   0   $ 0
Impairment (reversal of) charges   $ 0 $ 0 $ (79,000)    
Purchase and Assumption Agreement, deposit liability transferred, premium percent 6.00%          
Non-agency CMOs            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Securities called by issuer | security       1    
Interest rate lock commitments on residential mortgages            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Increase (decrease) in fair value       $ 1,000    
Level 3 | Municipal bonds            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Number of investment securities | security   1 1 1 1 1
Level 3 | Collateralized Mortgage Obligations            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Number of investment securities | security   3   3   3
Level 3 | Interest rate lock commitments on residential mortgages | Measurement Input, Pull Through            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Asset, measurement input (percent)   0.92   0.92    
Level 3 | Interest rate lock commitments on residential mortgages | Measurement Input, Pull Through Increase (Decrease)            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Asset, measurement input (percent)   0.05   0.05