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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, 2021
Sep. 30, 2025
USD ($)
Sep. 30, 2024
Sep. 30, 2025
USD ($)
reporting_unit
branch
segment
Sep. 30, 2024
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total number of service offices | branch       21    
Accrued interest receivable on available-for-sale and held-to-maturity securities   $ 904   $ 904   $ 920
Liquidating investment period (in years)       10 years    
Other investments   12,370   $ 12,370   12,500
Loans charged off past due more than days       180 days    
Closed end loan charged off past due more than days       120 days    
Interest receivable   4,775   $ 4,775   4,467
Number of operating segments | segment       1    
Number of reporting units | reporting_unit       1    
Carrying amount of investment   $ 3,700   $ 3,700    
Effective income tax rate   18.80% 21.50% 19.20% 21.60%  
Loan commitments outstanding   $ 4,570   $ 4,570    
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   0   $ 0   0
Federal Home Loan Bank Long Term Debt            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Advance from FHLB   $ 0   $ 0   5,000
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   $ 3,727   $ 3,727   3,865
Federal Reserve Bank            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other investments   5,725   5,725   5,717
Bankers Bank Stock            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Other investments   $ 2,918   $ 2,918   $ 2,918
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