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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Sep. 30, 2023 USD ($) branch segment reporting_unit | Sep. 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 | $ 15,109 |  |  | $ 15,834 |  |  |  | $ 15,109 |  | $ 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 |  |  | $ 0 | $ 488 |  |
Effective income tax rate | 50.50% |  |  |  | 24.30% |  |  | 34.30% | 24.30% |  |
Reduction in income tax expense |  |  |  |  |  |  |  | $ 553 |  |  |
Deferred tax asset valuation allowance |  |  |  |  |  |  |  | 1,828 | $ 0 |  |
Accounting Standards Update [Extensible List] |  |  |  |  |  |  |  |  |  | Accounting Standards Update 2016-13 |
Increase (decrease) to retained earnings | $ 67,424 |  |  | 65,400 |  |  |  | 67,424 |  | $ 65,400 |
Allowance for credit losses on unfunded commitments | 22,973 | $ 23,164 |  | 17,939 | $ 17,217 |  |  | 22,973 | 17,217 | 17,939 |
Net income | 2,498 | 3,206 | $ 3,662 | 4,696 | 3,993 | $ 4,366 | $ 4,706 | 9,366 | $ 13,065 |  |
Unfunded Commitment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded commitments | 1,571 | 1,544 |  | 0 |  |  |  | 1,571 |  | 0 |
Retained Earnings |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | 2,498 | 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 |  |  |  | 0 |  |  |  |  |  | 0 |
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 |  |  |  | 4,706 |  |  |  |  |  | 4,706 | $ (1,537)
Cumulative Change in Accounting Principal for Adoption | Accounting Standards Update 2016-13 | Unfunded Commitment |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded commitments |  | $ 0 |  | 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 |  |  |  |  |  |  | 98 |  |  |
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 |  |  |  |  |  |  |  | 3,044 |  | 3,350 |
FHLB |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 6,909 |  |  | 7,652 |  |  |  | 6,909 |  | 7,652 |
Federal Reserve Bank |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other investments | 5,692 |  |  | 5,674 |  |  |  | 5,692 |  | 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 |  |  |

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