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Summary of Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Allocation of goodwill by reporting unit    
Goodwill $ 47,396us-gaap_Goodwill $ 47,396us-gaap_Goodwill
Annuity [Member]    
Allocation of goodwill by reporting unit    
Goodwill 28,025us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_AnnuitySegmentMember		  
Life [Member]    
Allocation of goodwill by reporting unit    
Goodwill 9,911us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_LifeInsuranceSegmentMember		  
Property and casualty [Member]    
Allocation of goodwill by reporting unit    
Goodwill $ 9,460us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember