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Note 11 - Federal Home Loan Bank Advances (FHLB) and Other Borrowings (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 17, 2015
Dec. 15, 2014
Note 11 - Federal Home Loan Bank Advances (FHLB) and Other Borrowings (Details) [Line Items]          
Advances from Federal Home Loan Banks $ 0us-gaap_AdvancesFromFederalHomeLoanBanks $ 0us-gaap_AdvancesFromFederalHomeLoanBanks      
Pledged Assets, Not Separately Reported, Other 99,100,000us-gaap_PledgedAssetsNotSeparatelyReportedOtherFinancialInstruments        
Additional Advances from Federal Home Loan Banks 98,100,000hmnf_AdditionalAdvancesFromFederalHomeLoanBanks        
Loans from Other Federal Home Loan Banks 58,700,000us-gaap_LoansFromOtherFederalHomeLoanBanks        
Payments for Repurchase of Redeemable Preferred Stock 16,000,000us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock 0us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock 0us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock    
Subsequent Event [Member] | Notes Payable, Other Payables [Member]          
Note 11 - Federal Home Loan Bank Advances (FHLB) and Other Borrowings (Details) [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage       6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Debt Instrument, Annual Principal Payment 1,000,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
      1,000,000us-gaap_DebtInstrumentAnnualPrincipalPayment
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Proceeds from Issuance of Debt       10,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event [Member]          
Note 11 - Federal Home Loan Bank Advances (FHLB) and Other Borrowings (Details) [Line Items]          
Payments for Repurchase of Redeemable Preferred Stock       10,000,000us-gaap_PaymentsForRepurchaseOfRedeemablePreferredStock
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Notes Payable, Other Payables [Member]          
Note 11 - Federal Home Loan Bank Advances (FHLB) and Other Borrowings (Details) [Line Items]          
Debt Instrument, Unused Borrowing Capacity, Amount         10,000,000us-gaap_DebtInstrumentUnusedBorrowingCapacityAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Debt Instrument, Interest Rate, Stated Percentage         6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Long-term Debt $ 0us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember