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Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred policy acquisition costs asset by segment    
Total $ 215,082us-gaap_DeferredPolicyAcquisitionCosts $ 245,355us-gaap_DeferredPolicyAcquisitionCosts
Annuity [Member]    
Deferred policy acquisition costs asset by segment    
Total 143,522us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_AnnuitySegmentMember		 170,749us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_AnnuitySegmentMember
Life [Member]    
Deferred policy acquisition costs asset by segment    
Total 44,400us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		 48,558us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember
Property and casualty [Member]    
Deferred policy acquisition costs asset by segment    
Total $ 27,160us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember		 $ 26,048us-gaap_DeferredPolicyAcquisitionCosts
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember