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Note 18 - Derivative Instruments and Hedging Activities (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Note 18 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Increase (Decrease) in Derivative Liabilities $ 1,000us-gaap_IncreaseDecreaseInDerivativeLiabilities $ 6,000us-gaap_IncreaseDecreaseInDerivativeLiabilities
Increase (Decrease) in Derivative Assets 1,000us-gaap_IncreaseDecreaseInDerivativeAssets 6,000us-gaap_IncreaseDecreaseInDerivativeAssets
Mortgage Pipeline [Member]    
Note 18 - Derivative Instruments and Hedging Activities (Details) [Line Items]    
Increase (Decrease) in Derivative Liabilities (7,000)us-gaap_IncreaseDecreaseInDerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= hmnf_MortgagePipelineMember		 (24,000)us-gaap_IncreaseDecreaseInDerivativeLiabilities
/ us-gaap_DerivativeByNatureAxis
= hmnf_MortgagePipelineMember
Derivative, Gain (Loss) on Derivative, Net 15,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hmnf_MortgagePipelineMember		 (26,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeByNatureAxis
= hmnf_MortgagePipelineMember
Increase (Decrease) in Derivative Assets $ 8,000us-gaap_IncreaseDecreaseInDerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= hmnf_MortgagePipelineMember		 $ (2,000)us-gaap_IncreaseDecreaseInDerivativeAssets
/ us-gaap_DerivativeByNatureAxis
= hmnf_MortgagePipelineMember