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Fair Value of Financial Instruments (Details Textual) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value of Financial Instruments (Textual) [Abstract]      
Percentage of Investment portfolio fair value pricing services or index price 91.00%hmn_PercentageOfInvestmentPortfolioFairValuePricingServicesOrIndexPrice 87.00%hmn_PercentageOfInvestmentPortfolioFairValuePricingServicesOrIndexPrice  
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net $ (1,157)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet $ 0us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet $ 0us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Level 3 [Member]      
Fair Value of Financial Instruments (Textual) [Abstract]      
Percentage of Invested assets in total investment portfolio level 3 2.30%hmn_PercentageOfInvestedAssetsInTotalInvestmentPortfolioLevel3
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		    
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net $ 1,157us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member