Name:	hmnf_LoansAndLeasesReceivableRelatedPartiesLoansReclassified
Namespace Prefix:	hmnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

No authoritative reference available.

No definition available.

Name:	hmnf_LoansAndLeasesReceivableRelatedPartiesLoansSold
Namespace Prefix:	hmnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	hmnf_Note4LoansReceivableNetDetailsLineItems
Namespace Prefix:	hmnf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The interest rates on receivable loans and lease commitments.

No definition available.

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

Total commitments to originate or purchase loans are fixed rate loans.

No definition available.

Name:	hmnf_ReceivableLoansAndLeaseCommitmentsToOriginateOrPurchaseLoans
Namespace Prefix:	hmnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Servicing liability for others unpaid principal balance.

No definition available.

Name:	hmnf_ServicingLiabilityForOthersUnpaidPrincipalBalance
Namespace Prefix:	hmnf_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

For an unclassified balance sheet, reflects the carrying amount of unpaid loan amounts due from related parties at the balance sheet date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 850

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(e))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph e

-Article 9

Name:	us-gaap_LoansAndLeasesReceivableRelatedParties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Reflects the amount of new advances made to related parties in the form of loan and lease receivables.

Name:	us-gaap_LoansAndLeasesReceivableRelatedPartiesAdditions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Reflects the amount of collections received from related parties to reduce the carrying amounts of loans and leases receivable due from them.

Name:	us-gaap_LoansAndLeasesReceivableRelatedPartiesCollections
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=hmnf_FixedRateLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=hmnf_OfficersAndDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: