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Summary of Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Earnings Per Share, Potentially Dilutive Securities | $28.88 to $30.24 |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Acquisition costs amortization in years for individual life contracts term one | 10 years |  |
Acquisition costs amortization in years for individual life contracts term two | 15 years |  |
Acquisition costs amortization in years for individual life contracts term three | 20 years |  |
Acquisition costs amortization in years for individual life contracts term four | 30 years |  |
Property and Casualty policy, acquisition cost amortized term one | 6 months |  |
Property and Casualty policy, acquisition cost amortized term two | 12 months |  |
Financial market performance assumption | 10.00%hmn_PercentageOfReversionToMeanApproachUtilizedToAmortizePolicyAcquisitionCosts |  |
Compensation cost for share-based compensation plans based on the fair value | $ 1,270 us-gaap_AllocatedShareBasedCompensationExpense | $ 1,419 us-gaap_AllocatedShareBasedCompensationExpense | $ 2,476 us-gaap_AllocatedShareBasedCompensationExpense
Number of options not included in diluted earnings per share computation | 178,820 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Weighted average fair value of nonvested options outstanding | $ 7.95 hmn_WeightedAverageFairValueOfNonvestedOptionsOutstanding |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 10,943 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | 22,245 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax | 27,298 us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Federal Home Loan Bank Advances Branch Of FHLB Bank Borrowings Description | Any borrowing from the FHLB requires the purchase of FHLB activity-based common stock in an amount equal to 5.0% of the borrowing, or a lower percentage such as 2.0% based on the Reduced Capitalization Advance Program. |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate | 0.26%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate |  |
Financial market performance corridor assumption with basis point | 200 hmn_BasisPointCorridorAroundMeanAssumptionsUtilizedToAmortizePolicyAcquisitionCosts |  |
Other Tax Expense (Benefit) | 3,830 us-gaap_OtherTaxExpenseBenefit | 7,786 us-gaap_OtherTaxExpenseBenefit |
Maturing On December 28, 2015 [Member] |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 125,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / hmn_MaturityDateAxis = hmn_MaturingOnDecemberTwoEightTwoZeroOneFiveMember |  |
Maturing On December 15, 2023 [Member] |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 125,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / hmn_MaturityDateAxis = hmn_MaturingOnDecemberOneFiveTwoZeroTwoThreeMember |  |
Maturing On September 13, 2019 [Member] |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances | 250,000 us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch / hmn_MaturityDateAxis = hmn_MaturingOnSeptember132019Member |  |
Nonvested [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Nonvested options outstanding | 2,462 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = hmn_NonvestedMember |  |
Interest Sensitive Life Contracts [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Capitalized acquisition costs amortization period for interest-sensitive life contracts | 20 years |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Deferred Policy Acquisition Cost Ending Impact Of Unrealized Investment Gains Losses | $ 67,932 hmn_DeferredPolicyAcquisitionCostEndingImpactOfUnrealizedInvestmentGainsLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hmn_InterestSensitiveLifeContractsMember | $ 24,997 hmn_DeferredPolicyAcquisitionCostEndingImpactOfUnrealizedInvestmentGainsLosses / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = hmn_InterestSensitiveLifeContractsMember |
Investment Contracts [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Acquisition costs, amortization period | 20 years |  |
Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Reserve investment yield assumptions on certain life insurance policies | 8.00%hmn_ReserveInvestmentYieldAssumptionLife / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Guarantee Of Premium Annual Rate Percentage | 5.00%hmn_GuaranteeOfPremiumAnnualRatePercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Reserve investment yield assumptions on certain life insurance policies | 3.50%hmn_ReserveInvestmentYieldAssumptionLife / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Option expiration date | 2015 |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |
Guarantee Of Premium Annual Rate Percentage | 3.00%hmn_GuaranteeOfPremiumAnnualRatePercentage / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Leasehold improvements and other property and equipment [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 10 years |  |
Leasehold improvements and other property and equipment [Member] | Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 2 years |  |
Real Estate Property [Member] | Maximum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 45 years |  |
Real Estate Property [Member] | Minimum [Member] |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |
Estimated useful lives of property and equipment | 20 years |  |

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- Definition The number of years over which capitalized acquisition costs are amortized on interest sensitive life contracts. Capitalized acquisition costs are amortized in proportion to estimated gross profits. + References No definition available. + Details
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- Definition Amount of advances from the Federal Home Loan Bank (FHLB). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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