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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
branch
reporting_unit
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Jan. 01, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Liquidating investment period (in years)             10 years      
Other investments $ 16,347   $ 15,834       $ 16,347   $ 15,834  
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 0       $ 162   $ 0 $ 325    
Accounting Standards Update [Extensible List]                 Accounting Standards Update 2016-13  
Increase (decrease) to retained earnings 64,926   65,400       64,926   $ 65,400  
Allowance for credit losses on unfunded commitments 23,164   17,939   16,825   23,164 16,825 17,939  
Net income 3,206 $ 3,662 4,696 $ 3,993 4,366 $ 4,706 6,868 $ 9,072    
Retained Earnings                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Net income 3,206 $ 3,662 4,696 $ 3,993 $ 4,366 $ 4,706        
Accounting Standards Update 2016-13                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Allowance for credit losses on unfunded commitments                   $ (1,537)
Cumulative change in accounting principal for adoption | Accounting Standards Update 2016-13                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Allowance for credit losses on unfunded commitments     (1,537)           (1,537)  
Cumulative change in accounting principal for adoption | Accounting Standards Update 2016-13 | Retained Earnings                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase (decrease) to retained earnings     (4,432)           (4,432)  
Allowance for credit losses on unfunded commitments     4,706           4,706  
Increase of non-purchased credit deteriorated loans     4,576           4,576  
Increase of purchased credit deteriorated loans     130           130  
Adjusted to addition of allowance for credit losses                   $ 130
Cumulative change in accounting principal for adoption | Accounting Standards Update 2016-13 | Retained Earnings | Unfunded commitment                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Allowance for credit losses on unfunded commitments     1,537           1,537  
Cumulative change in accounting principal for adoption | Accounting Standards Update 2023-02                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Net income 33           65      
Cumulative change in accounting principal for adoption | Accounting Standards Update 2023-02 | Retained Earnings                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Increase (decrease) to retained earnings     130           130  
Other Assets                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Carrying amount of investment             3,189   3,350  
FHLB                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Other investments 8,153   7,652       8,153   7,652  
Federal Reserve Bank                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Other investments 5,686   5,674       5,686   5,674  
Bankers Bank Stock                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Other investments $ 2,508   $ 2,508       $ 2,508   $ 2,508  
Commercial Loan                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Interest income discontinued over delinquent days             90 days      
Closed End 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      
Wisconsin and Minnesota                    
Accounts, Notes, Loans and Financing Receivable [Line Items]                    
Number of branch locations | branch             23