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Fair Value of Financial Instruments (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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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 | $ 0 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet | $ 0 us-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 | $ 1,157 us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |

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- Definition Percentage of invested assets in the total investment portfolio in Level 3. + References No definition available. + Details
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- Definition Percentage of investment portfolio fair value pricing services or index price. + References No definition available. + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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