Note 17 - Regulatory Capital (Details Textual)	Jan. 01, 2019
Capital Conservation Buffer	2.50%

Percentage of common equity tier 1 capital above its minimum risk-based capital requirements in order to avoid limitations on capital distributions, including dividend payments and certain discretionary bonus payments to executive officers.

No definition available.

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Namespace Prefix:	hmnf_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration