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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
reporting_unit
segment
branch
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 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 $ 17,428 $ 15,834       $ 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       $ 163    
Accounting Standards Update [Extensible List]           Accounting Standards Update 2016-13  
Increase (decrease) to retained earnings 61,720 65,400       $ 65,400  
Allowance for credit losses on unfunded commitments 22,679 17,939     16,818 17,939  
Net income 3,662 4,696 $ 3,993 $ 4,366 4,706    
Retained Earnings              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Net income 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 (decrease) of non-purchased credit deteriorated loans   4,576       4,576  
Increase (decrease) 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 32            
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         $ 3,334 3,350  
FHLB              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Other investments 9,240 7,652       7,652  
Federal Reserve Bank              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Other investments 5,680 5,674       5,674  
Bankers Bank Stock              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Other investments $ 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 24