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Note 3 - Business Combinations (Details Textual) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 09, 2024 USD ($) shares | Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($) | Oct. 08, 2024 $ / shares | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Assets |  | $ 4,084,640 | $ 4,084,640 |  |  | $ 3,907,713 | $ 3,832,978
Deposits |  | 3,323,550 | 3,323,550 |  |  | $ 3,095,611 |
HMN Financial Inc. (HNMF) [Member] |  |  |  |  |  |  |
Assets |  |  |  |  | $ 1,100,000 |  |
Financing Receivable, after Allowance for Credit Loss |  |  |  |  | 876,600 |  |
Investments |  |  |  |  | 199,000 |  |
Deposits |  |  |  |  | $ 983,200 |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Assets | $ 5,500,000 |  |  |  |  |  |
Financing Receivable, after Allowance for Credit Loss | 3,800,000 |  |  |  |  |  |
Deposits | 4,300,000 |  |  |  |  |  |
Assets under Management, Carrying Amount | $ 43,600,000 |  |  |  |  |  |
Subsequent Event [Member] | HMN Financial Inc. (HNMF) [Member] |  |  |  |  |  |  |
Subsidiary, Ownership Percentage, Noncontrolling Owner | 21.90% |  |  |  |  |  |
Home Federal [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 128,800 |  |  |  |  |  |
Share Price (in dollars per share) | $ / shares |  |  |  | $ 22.9 |  |  |
Home Federal [Member] | Subsequent Event [Member] | US Midwest Region [Member] |  |  |  |  |  |  |
Number of Branches | 29 |  |  |  |  |  |
HMN Financial Inc. (HNMF) [Member] |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  | $ 1,700 | $ 2,300 |  |  |  |
HMN Financial Inc. (HNMF) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Shares Exchanged per Share (in shares) | shares | 1.25 |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | 5,547,658 |  |  |  |  |  |
HMN Financial Inc. (HNMF) [Member] | Subsequent Event [Member] | MINNESOTA |  |  |  |  |  |  |
Number of Branches | 12 |  |  |  |  |  |
HMN Financial Inc. (HNMF) [Member] | Subsequent Event [Member] | IOWA |  |  |  |  |  |  |
Number of Branches | 1 |  |  |  |  |  |
HMN Financial Inc. (HNMF) [Member] | Subsequent Event [Member] | WISCONSIN |  |  |  |  |  |  |
Number of Branches | 1 |  |  |  |  |  |

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