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Summary of Significant Accounting Policies (Details 4) (Guaranteed Minimum Death Benefit [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Guaranteed Minimum Death Benefit [Member]
    
Summary of guaranteed minimum death benefit    
GMDB reserve $ 278hmn_GuaranteedMinimumDeathBenefitReserve
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember		 $ 209hmn_GuaranteedMinimumDeathBenefitReserve
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
Aggregate in-the-money death benefits under the GMDB provision $ 29,866hmn_AggregateInMoneyDeathBenefitsUnderGuaranteedMinimumDeathBenefitReserveProvision
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember		 $ 30,422hmn_AggregateInMoneyDeathBenefitsUnderGuaranteedMinimumDeathBenefitReserveProvision
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
Variable annuity contract value distribution based on GMDB feature:    
No guarantee 31.00%hmn_VariableAnnuityContractValueDistributionNoGuaranteePercent
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember		 30.00%hmn_VariableAnnuityContractValueDistributionNoGuaranteePercent
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
Return of premium guarantee 63.00%hmn_VariableAnnuityContractValueDistributionReturnOfPremiumGuaranteePercent
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember		 64.00%hmn_VariableAnnuityContractValueDistributionReturnOfPremiumGuaranteePercent
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
Guarantee of premium roll-up at an annual rate of 3% or 5% 6.00%hmn_VariableAnnuityContractValueDistributionGuaranteeOfPremiumRollUpAnnualInterestRate
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember		 6.00%hmn_VariableAnnuityContractValueDistributionGuaranteeOfPremiumRollUpAnnualInterestRate
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember
Total 100.00%hmn_VariableAnnuityContractValueDistributionPercent
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember		 100.00%hmn_VariableAnnuityContractValueDistributionPercent
/ us-gaap_LiabilitiesForGuaranteesOnLongDurationContractsGuaranteeTypeAxis
= us-gaap_GuaranteedMinimumDeathBenefitMember