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Property and Casualty Unpaid Claims and Claim Expenses (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Property and Casualty Unpaid Claims and Claim Expenses (Textual) [Abstract] |  |  |  |
Benefits, claims and settlement expenses | $ 468,426 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 448,317 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet | $ 448,250 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet |
Property and Casualty Unpaid Claims and Claim Expenses (Additional Textual) [Abstract] |  |  |  |
Favorable development of total reserves for property and casualty claims occurring in prior years | 17,000 hmn_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiabilityPriorYearsFavorableDevelopment | 17,988 hmn_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiabilityPriorYearsFavorableDevelopment | 17,175 hmn_LiabilityForClaimsAndClaimsAdjustmentExpensePropertyCasualtyLiabilityPriorYearsFavorableDevelopment |
Automobile liability coverage reserves as percentage of total reserves | 70.00%hmn_AutomobileLiabilityCoveragePercentReserves |  |  |
Short tail coverage reserves as percentage of total reserves | 20.00%hmn_ShortTailCoverageReservesAsPercentageOfReserves |  |  |
Long tail coverage reserves as percentage of total reserves | 80.00%hmn_LongTailCoverageReservesAsPercentageOfReserves |  |  |
Potential variability of property and casualty loss reserves | 6.00%hmn_PotentialVariabilityOfPropertyAndCasualtyLossReserves |  |  |
Potential variability of property and casualty loss reserves plus minus of net income | 10,000 hmn_ProbabilityOfOtherPossibleOutcomesPossibleImpactOnNetIncome |  |  |
Life and Annuity [Member] |  |  |  |
Property and Casualty Unpaid Claims and Claim Expenses (Textual) [Abstract] |  |  |  |
Unpaid claims and claim expenses | 14,687 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember | 15,818 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember | 14,853 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember | 13,729 us-gaap_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember
Benefits, claims and settlement expenses | $ 68,914 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember | $ 62,716 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember | $ 58,820 us-gaap_PolicyholderBenefitsAndClaimsIncurredNet / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndAnnuitySegmentsCombinedMember |

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- Definition Automobile liability coverage reserves as a percentage of total reserves. + References No definition available. + Details
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- Definition The reduction in the estimate of the amount needed to settle claims relating to property and casualty insured events that have occurred in prior years. + References No definition available. + Details
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- Definition Long tail coverage reserves as a percentage of total reserves. + References No definition available. + Details
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- Definition Potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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- Definition Equated Net Income impact (plus or minus) of potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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- Definition Short tail coverage reserves as a percentage of total reserves. + References No definition available. + Details
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- Definition Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 403 -Paragraph 04 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 5 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6811-158387 + Details
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