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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
operating_segment
branch_location
reporting_unit
segment
account
Dec. 31, 2022
USD ($)
Jan. 01, 2023
USD ($)
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      
Number of accounts, FDIC insured amount, balance in excess | account   0     0
Liquidating investment period (in years)   10 years      
Other investments   $ 15,725 $ 15,834    
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 portfolio segments | segment   4      
Number of operating segments | operating_segment   1      
Number of reporting units | reporting_unit   1      
Amortization expense   $ 452 650    
New market tax credit depletion   $ 0 $ 650    
Effective income tax rate   31.00% 24.70%    
Deferred tax asset valuation allowance, net of accretion $ 1,828 $ (1,822)      
Loan commitments outstanding   1,672      
Accounting Standards Update [Extensible List]     Accounting Standards Update 2016-13    
Retained earnings   71,117 $ 65,400    
Unfunded commitments   22,908 17,939    
Net income   13,059 17,761    
Unfunded Commitment          
Property, Plant and Equipment [Line Items]          
Unfunded commitments   1,250 0   $ 0
Retained Earnings          
Property, Plant and Equipment [Line Items]          
Net income   13,059 17,761    
Accounting Standards Update 2016-13          
Property, Plant and Equipment [Line Items]          
Unfunded commitments     0    
Accounting Standards Update 2016-13 | Cumulative Change in Accounting Principal for Adoption          
Property, Plant and Equipment [Line Items]          
Unfunded commitments     4,706 $ (1,537)  
Accounting Standards Update 2016-13 | Cumulative Change in Accounting Principal for Adoption | Unfunded Commitment          
Property, Plant and Equipment [Line Items]          
Unfunded commitments     1,537   $ 0
Accounting Standards Update 2016-13 | Cumulative Change in Accounting Principal for Adoption | Retained Earnings          
Property, Plant and Equipment [Line Items]          
Retained earnings     (4,432)    
Unfunded commitments     4,706    
Increase of non-purchased credit deteriorated loans     4,576    
Increase of purchased credit deteriorated loans     130    
Adjusted to addition of allowance for credit losses       $ 130  
Accounting Standards Update 2016-13 | Cumulative Change in Accounting Principal for Adoption | Retained Earnings | Unfunded Commitment          
Property, Plant and Equipment [Line Items]          
Unfunded commitments     1,537    
Cumulative change in accounting principle for adoption of ASU2023-02 | Cumulative Change in Accounting Principal for Adoption          
Property, Plant and Equipment [Line Items]          
Net income   120      
Cumulative change in accounting principle for adoption of ASU2023-02 | Cumulative Change in Accounting Principal for Adoption | Retained Earnings          
Property, Plant and Equipment [Line Items]          
Retained earnings     130    
Other Assets          
Property, Plant and Equipment [Line Items]          
New market tax credit depletion   $ 2,898 3,350    
Minimum          
Property, Plant and Equipment [Line Items]          
Intangible asset, useful life   72 months      
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 | 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   $ 7,302 7,652    
Federal Reserve Bank          
Property, Plant and Equipment [Line Items]          
Other investments   5,699 5,674    
Bankers Bank Stock          
Property, Plant and Equipment [Line Items]          
Other investments   $ 2,724 $ 2,508    
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