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NATURE OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2021 USD ($) branch | Mar. 31, 2021 USD ($) operating_segment | Mar. 31, 2021 USD ($) reporting_unit | Mar. 31, 2021 USD ($) segment | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments | $ 15,069 | $ 15,069 | $ 15,069 | $ 15,069 | $ 15,069 | $ 14,948
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 |  |  | 1 |  | 1 |
Number of reporting units | reporting_unit |  |  |  | 1 |  |
FHLB |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments | $ 8,041 | 8,041 | $ 8,041 | $ 8,041 | $ 8,041 | 8,103
Federal Reserve Bank |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments | 5,181 | 5,181 | 5,181 | 5,181 | 5,181 | 5,170
Bankers Bank Stock |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Other investments | $ 1,847 | $ 1,847 | $ 1,847 | $ 1,847 | $ 1,847 | $ 1,675
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 |  | 25 |  |  |  |

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