Note 18 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Letters of Credit Issued and Available Amount	$ 11.4	$ 7.6

The letters of credit issued and available amount.

No definition available.

Name:	hmnf_LettersOfCreditIssuedAndAvailableAmount
Namespace Prefix:	hmnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant