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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
account
branch_location
Dec. 31, 2022
USD ($)
reporting_unit
account
operating_segment
Dec. 31, 2021
USD ($)
account
Property, Plant and Equipment [Line Items]      
Total number of service offices | branch_location 23    
Maturity of certificate of deposit investments   9 months  
Cash, FDIC insured amount, balance in excess $ 250 $ 250  
Number of accounts, FDIC insured amount, balance in excess | account 0 0 0
Liquidating investment period (in years)   10 years  
Other investments $ 15,834 $ 15,834 $ 15,305
Interest income recognized debt past due not more than days   90 days  
Loans charged off past due more than days   180 days  
Closed end loan charged off past due more than days   120 days  
Number of operating segments | operating_segment   1  
Number of reporting units | reporting_unit   1  
New market tax credit depletion   $ 650 0
Loan commitments outstanding $ 1,164 $ 1,164  
Accounting Standards Update 2016-13      
Property, Plant and Equipment [Line Items]      
Increase in acquired loan portfolio percentage 30.00% 30.00%  
Increase in expected life of the loans percentage 40.00% 40.00%  
Increase in allowance non-cancelable off-balance sheet commitments percentage 30.00% 30.00%  
Decrease in post-tax retained earnings adjustment percentage 0.20% 0.20%  
Other Assets      
Property, Plant and Equipment [Line Items]      
New market tax credit depletion   $ 3,350  
Minimum      
Property, Plant and Equipment [Line Items]      
Intangible asset, useful life   48 months  
Minimum | Accounting Standards Update 2016-13      
Property, Plant and Equipment [Line Items]      
Increase in allowance for credit losses percentage 2500.00% 2500.00%  
Minimum | Buildings and Components      
Property, Plant and Equipment [Line Items]      
Useful lives assets   10 years  
Minimum | Furniture Fixtures and Equipment      
Property, Plant and Equipment [Line Items]      
Useful lives assets   3 years  
Maximum      
Property, Plant and Equipment [Line Items]      
Intangible asset, useful life   111 months  
Maximum | Accounting Standards Update 2016-13      
Property, Plant and Equipment [Line Items]      
Increase in allowance for credit losses percentage 30.00% 30.00%  
Maximum | Buildings and Components      
Property, Plant and Equipment [Line Items]      
Useful lives assets   40 years  
Maximum | Furniture Fixtures and Equipment      
Property, Plant and Equipment [Line Items]      
Useful lives assets   10 years  
Investment in Federal Home Loan Bank Stock      
Property, Plant and Equipment [Line Items]      
Other investments $ 7,652 $ 7,652 7,877
Federal Reserve Bank      
Property, Plant and Equipment [Line Items]      
Other investments 5,674 5,674 5,200
Bankers Bank Stock      
Property, Plant and Equipment [Line Items]      
Other investments $ 2,508 $ 2,508 $ 2,228
Commercial Loan      
Property, Plant and Equipment [Line Items]      
Interest income discontinued over delinquent days   90 days  
Closed End Consumer Loan      
Property, Plant and Equipment [Line Items]      
Interest income discontinued over delinquent days   120 days  
Real Estate and Open Ended Consumer Loans      
Property, Plant and Equipment [Line Items]      
Interest income discontinued over delinquent days   180 days