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Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans $ 10,920us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest $ 17,496us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest $ 30,000us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
1-4 Family [Member]      
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans 1,564us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_Family14Member		 1,602us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_Family14Member		  
Residential Developments [Member]      
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans 8,483us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_ResidentialDevelopmentsMember		 14,146us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_ResidentialDevelopmentsMember		  
Commercial Real Estate Other [Member]      
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans 267us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_CommercialRealEstateOtherMember		 403us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_CommercialRealEstateOtherMember		  
Consumer [Member]      
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans 486us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_ConsumerMember		 737us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_ConsumerMember		  
Construction Industry [Member]      
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans 80us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_ConstructionIndustryMember		 93us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_ConstructionIndustryMember		  
Commercial Business Other [Member]      
Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Non-Accrual Loans [Line Items]      
Non Accrual Loans $ 40us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_CommercialBusinessOtherMember		 $ 515us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hmnf_CommercialBusinessOtherMember