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Note 16 - Regulatory Matters/Supervisory Agreements and IMCR (Details)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Jan. 01, 2015
Note 16 - Regulatory Matters/Supervisory Agreements and IMCR (Details) [Line Items]        
Tangible Capital to Tangible Assets   12.22%us-gaap_TangibleCapitalToTangibleAssets 8.50%us-gaap_TangibleCapitalToTangibleAssets  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [1] 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [1]    
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [1] 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets [1]    
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets [1] 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets [1]    
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets [1] 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets [1]    
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets [1] 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets [1]    
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets [1] 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets [1]    
Subsequent Event [Member]        
Note 16 - Regulatory Matters/Supervisory Agreements and IMCR (Details) [Line Items]        
Capital Required to be Well Capitalized to Risk Weighted Assets       10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets       8.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tier One Risk Based Common Equity Required to Be Well Capitalized to Risk Weighted Assets       6.50%hmnf_TierOneRiskBasedCommonEquityRequiredToBeWellCapitalizedToRiskWeightedAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tier One Leverage Capital Required to be Well Capitalized to Average Assets       5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Capital Required for Capital Adequacy to Risk Weighted Assets       8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets       6.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tier One Risk Based Common Equity Required for Capital Adequacy to Risk Weighted Asset       4.50%hmnf_TierOneRiskBasedCommonEquityRequiredForCapitalAdequacyToRiskWeightedAsset
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Tier One Leverage Capital Required for Capital Adequacy to Average Assets       4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
[1] Based upon the Bank's adjusted total assets for the purpose of the Tier I or core capital ratios and risk-weighted assets for the purpose of the risk-based capital ratio.