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Reinsurance and Catastrophes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of reinsurance recoverable on unpaid insurance reserves    
Reinsurance Recoverables $ 53,332us-gaap_ReinsuranceRecoverables $ 24,502us-gaap_ReinsuranceRecoverables
Reinsurance companies [Member]    
Summary of reinsurance recoverable on unpaid insurance reserves    
Reinsurance Recoverables 7,772us-gaap_ReinsuranceRecoverables
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_PropertyLiabilityAndCasualtyInsuranceReinsuranceCompaniesMember		 10,152us-gaap_ReinsuranceRecoverables
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_PropertyLiabilityAndCasualtyInsuranceReinsuranceCompaniesMember
State insurance facilities [Member]    
Summary of reinsurance recoverable on unpaid insurance reserves    
Reinsurance Recoverables 35,968us-gaap_ReinsuranceRecoverables
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_PropertyLiabilityAndCasualtyInsuranceStateInsuranceFacilitiesMember		 3,955us-gaap_ReinsuranceRecoverables
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_PropertyLiabilityAndCasualtyInsuranceStateInsuranceFacilitiesMember
Life and health [Member]    
Summary of reinsurance recoverable on unpaid insurance reserves    
Reinsurance Recoverables $ 9,592us-gaap_ReinsuranceRecoverables
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_LifeAndHealthMember		 $ 10,395us-gaap_ReinsuranceRecoverables
/ us-gaap_StatementBusinessSegmentsAxis
= hmn_LifeAndHealthMember