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Note 5 - Allowance for Loan Losses and Credit Quality Information (Details) - Troubled Debt Restructurings (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings $ 9,450us-gaap_FinancingReceivableModificationsRecordedInvestment $ 17,392us-gaap_FinancingReceivableModificationsRecordedInvestment $ 31,700us-gaap_FinancingReceivableModificationsRecordedInvestment
1-4 Family [Member]      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings 368us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_Family14Member		 840us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_Family14Member		  
Residential Developments [Member]      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings 7,432us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_ResidentialDevelopmentsMember		 14,244us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_ResidentialDevelopmentsMember		  
Commercial Real Estate Other [Member]      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings 524us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_CommercialRealEstateOtherMember		 537us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_CommercialRealEstateOtherMember		  
Consumer [Member]      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings 571us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_ConsumerMember		 697us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_ConsumerMember		  
Construction Industry [Member]      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings 80us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_ConstructionIndustryMember		 93us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_ConstructionIndustryMember		  
Commercial Business Other [Member]      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructings $ 475us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_CommercialBusinessOtherMember		 $ 981us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= hmnf_CommercialBusinessOtherMember