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Fair Value of Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair Value of Financial Instruments (Textual) [Abstract]    
Embedded Derivative, Gain (Loss) on Embedded Derivative Total $ 439us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet $ (12)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Level 3 [Member]    
Fair Value of Financial Instruments (Textual) [Abstract]    
Embedded Derivative, Gain (Loss) on Embedded Derivative Total $ 439us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 $ (12)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Percentage Of Invested Assets In Total Investment Portfolio Level3 Recurring 2.10%hmn_PercentageOfInvestedAssetsInTotalInvestmentPortfolioLevel3Recurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member