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.

Name:	hmnf_CapitalConservationBuffer
Namespace Prefix:	hmnf_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration