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FAIR VALUE - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 23, 2022
Mar. 31, 2023
USD ($)
security
Mar. 31, 2022
USD ($)
security
Dec. 31, 2022
USD ($)
security
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value option, aggregate fair value exceeded (less than) principal amount   $ (867,000)   $ (1,200,000)
Increase (decrease) in fair value   5,302,000 $ 32,903,000  
Increase (decrease) loans evaluated for credit loss   225,000   (40,000)
OREO balances   85,000   $ 85,000
Impairment reserve for mortgage servicing rights   0    
Reversal of charges   0 $ (32,000)  
Purchase and Assumption Agreement, deposit liability transferred, premium percent 6.00%      
Interest rate lock commitments on residential mortgages        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Increase (decrease) in fair value   $ 4,000    
Level 3 | Municipal Bonds        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Number of investment securities | security   1   1
Level 3 | Non-agency CMOs        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Number of investment securities | security   3 1 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    
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