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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2020
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
reporting_unit
segment
branch
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total number of service offices | branch       22    
Liquidating investment period (in years)       10 years    
Other investments   $ 12,311   $ 12,311   $ 15,725
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 | segment       1    
Number of reporting units | reporting_unit       1    
Carrying amount of investment       $ 4,719    
Effective income tax rate   21.50% 50.50% 21.60% 34.30%  
Deferred tax asset valuation allowance     $ 1,828 $ 0 $ 1,828  
Loan commitments outstanding   $ 3,411   $ 3,411    
2018 Equity Incentive Plan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Vesting period of shares (in years)       3 years    
Time Based Restricted Stock | 2018 Equity Incentive Plan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Vesting period of shares (in years)       3 years    
Performance-based Restricted Stock | 2018 Equity Incentive Plan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Vesting period of shares (in years) 3 years     3 years    
Federal Home Loan Bank Short Term Debt            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Advance from FHLB   11,000   $ 11,000   44,000
Federal Home Loan Bank Long Term Debt            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Advance from FHLB   $ 10,000   $ 10,000   35,530
Minimum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Useful life of intangible assets   72 months   72 months    
Minimum | Buildings and Components            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Useful life of property and equipment (in years)   10 years   10 years    
Minimum | Furniture Fixtures and Equipment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Useful life of property and equipment (in years)   3 years   3 years    
Maximum            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Useful life of intangible assets   111 months   111 months    
Maximum | Buildings and Components            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Useful life of property and equipment (in years)   40 years   40 years    
Maximum | Furniture Fixtures and Equipment            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Useful life of property and equipment (in years)   10 years   10 years    
FHLB            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other investments   $ 3,875   $ 3,875   7,302
Federal Reserve Bank            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other investments   5,712   5,712   5,699
Bankers Bank Stock            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other investments   $ 2,724   $ 2,724   $ 2,724
Commercial Loan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest income discontinued over delinquent days       90 days    
Closed Ended Consumer Loan            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest income discontinued over delinquent days       120 days    
Real Estate and Open Ended Consumer Loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Interest income discontinued over delinquent days       180 days