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Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial $ 191,668us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial $ 194,450us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
Loans and leases receivable gross carrying amount commercial-Percentage 100.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage 100.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
AL [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 2,202us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_ALMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_ALMember
Loans and leases receivable gross carrying amount commercial-Percentage 1.20%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_ALMember		 0.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_ALMember
FL [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 2,253us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_FLMember		 2,312us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_FLMember
Loans and leases receivable gross carrying amount commercial-Percentage 1.20%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_FLMember		 1.20%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_FLMember
ID [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 3,810us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_IDMember		 3,936us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_IDMember
Loans and leases receivable gross carrying amount commercial-Percentage 2.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_IDMember		 2.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_IDMember
IN [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 3,501us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_INMember		 5,023us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_INMember
Loans and leases receivable gross carrying amount commercial-Percentage 1.80%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_INMember		 2.60%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_INMember
IA [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_IAMember		 1,267us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_IAMember
Loans and leases receivable gross carrying amount commercial-Percentage 0.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_IAMember		 0.60%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_IAMember
MI [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 2,558us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_MIMember		 0us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_MIMember
Loans and leases receivable gross carrying amount commercial-Percentage 1.30%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_MIMember		 0.00%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_MIMember
MN [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 145,341us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_MNMember		 163,040us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_MNMember
Loans and leases receivable gross carrying amount commercial-Percentage 75.80%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_MNMember		 83.90%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_MNMember
NC [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 5,598us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_NCMember		 5,576us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_NCMember
Loans and leases receivable gross carrying amount commercial-Percentage 2.90%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_NCMember		 2.90%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_NCMember
ND [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 1,572us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_NDMember		 1,282us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_NDMember
Loans and leases receivable gross carrying amount commercial-Percentage 0.80%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_NDMember		 0.70%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_NDMember
WI [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial 22,354us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_WIMember		 10,589us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_WIMember
Loans and leases receivable gross carrying amount commercial-Percentage 11.70%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_WIMember		 5.40%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_WIMember
Other States [Member]    
Note 4 - Loans Receivable, Net (Details) - Commercial Real Estate Loans [Line Items]    
Loans and leases receivable gross carrying amount commercial $ 2,479us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_OtherStatesMember		 $ 1,425us-gaap_LoansAndLeasesReceivableGrossCarryingAmountCommercial
/ us-gaap_StatementGeographicalAxis
= hmnf_OtherStatesMember
Loans and leases receivable gross carrying amount commercial-Percentage 1.30%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_OtherStatesMember		 0.70%hmnf_LoansAndLeasesReceivableGrossCarryingAmountCommercialPercentage
/ us-gaap_StatementGeographicalAxis
= hmnf_OtherStatesMember