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Investments (Details Textual) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Investments (Textual) [Abstract]    
Fair value of issued securities $ 7,065,799us-gaap_AvailableForSaleSecuritiesDebtSecurities $ 6,893,090us-gaap_AvailableForSaleSecuritiesDebtSecurities
Investments (Additional Textual) [Abstract]    
Federal Home Loan Bank Funding Agreements 500,000hmn_FederalHomeLoanBankFundingAgreements 500,000hmn_FederalHomeLoanBankFundingAgreements
Investment Grade Rate 41.00%hmn_InvestmentGradeRate  
Federal Home Loan Bank [Member] | Fixed Maturities [Member]    
Investments (Additional Textual) [Abstract]    
Securities Deposited Fair Value 18,512hmn_SecuritiesDepositedFairValue
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= hmn_FederalHomeLoanBankMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember		 18,361hmn_SecuritiesDepositedFairValue
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= hmn_FederalHomeLoanBankMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Securities Deposited As Collateral 539,787hmn_SecuritiesDepositedAsCollateral
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= hmn_FederalHomeLoanBankMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember		 539,235hmn_SecuritiesDepositedAsCollateral
/ us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis
= hmn_FederalHomeLoanBankMember
/ us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis
= us-gaap_FixedMaturitiesMember
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]    
Investments (Textual) [Abstract]    
Fair value of issued securities 265,066us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember		 302,222us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]    
Investments (Textual) [Abstract]    
Fair value of issued securities 444,117us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember		 432,432us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]    
Investments (Textual) [Abstract]    
Fair value of issued securities $ 137,856us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember		 $ 137,867us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_InvestmentTypeAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember