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Pension Plans and Other Postretirement Benefits (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 2 Months Ended |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2006
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Reduction in expense due to changes in the plan for other postretirement benefits | $ 2,980 hmn_ReductionInExpensesDueToChangeInPlan | $ 196 hmn_ReductionInExpensesDueToChangeInPlan | $ 431 hmn_ReductionInExpensesDueToChangeInPlan |  |
Pension Plans and Other Postretirement Benefits (Additional Textual) [Abstract] |  |  |  |  |
Employer Contribution as Percentage of Eligible Compensation | 5.00%hmn_EmployerContributionAsPercentageOfEligibleCompensation |  |  |  |
Total expense recorded for plans | 11,850 us-gaap_PensionExpense | 10,295 us-gaap_PensionExpense | 10,415 us-gaap_PensionExpense |  |
Health reimbursement account balance | 2,485 hmn_HealthReimbursementAccountBalance |  |  | 2,485 hmn_HealthReimbursementAccountBalance | 7,310 hmn_HealthReimbursementAccountBalance
Health reimbursement accounts funding | 252 hmn_HealthReimbursementAccountsFunding | 181 hmn_HealthReimbursementAccountsFunding | 168 hmn_HealthReimbursementAccountsFunding | 252 hmn_HealthReimbursementAccountsFunding |
Total Fixed Maturities [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Allocation Percentage | 50% fixed income funds |  |  |  |
Equity Securities [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Defined Benefit Plan, Target Allocation Percentage | 50% equity |  |  |  |
Defined Benefit Plan [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Expected amortization of net loss expected in the next fiscal year | 1,626 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |  |  |  |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | 4,200 us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |  |  | 4,200 us-gaap_DeferredCompensationArrangementWithIndividualCashAwardGrantedAmount / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Deferred Compensation Arrangement with Individual, Compensation Expense |  |  |  | 1,600 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Defined Benefit Plan Termination Benefits, Terminated Participants Minimum Accrued Lump Sum Values |  |  |  | 100 hmn_DefinedBenefitPlanTerminationBenefitsTerminatedParticipantsMinimumAccruedLumpSumValues / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember |
Supplemental Retirement Plans [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Expected amortization of net loss expected in the next fiscal year | 273 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_SupplementalEmployeeRetirementPlanDefinedBenefitMember |  |  |  |
401 K [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Employee Vesting Percentage | 100.00%hmn_EmployeeVestingPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hmn_FourZeroOneKPlanMember |  |  |  |
401(k) Plan Employer Contribution Percent | 3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hmn_FourZeroOneKPlanMember |  |  |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year, Description | In November 2014, the Company communicated that effective January 1, 2015 it would begin matching each dollar of employee contributions up to a 5% maximum — in addition to maintaining the automatic 3% “safe harbor” contribution. |  |  |  |
Deferred Compensation Arrangement with Individual, Requisite Service Period | 5 years |  |  |  |
Pension Costs [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Expected amortization of net loss expected in the next fiscal year | $ 0 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionCostsMember |  |  |  |
Qualified Defined Contribution Plan [Member] |  |  |  |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |  |  |  |
Participants are 100% vested in the Defined Contribution plan after | 3 years |  |  |  |
Employee Vesting Percentage | 100.00%hmn_EmployeeVestingPercentage / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = hmn_QualifiedDefinedContributionPlanMember |  |  |  |

X
- Definition Represents Defined Benefit Plan Termination Benefits, Terminated Participants Minimum Accrued Lump Sum Values. + References No definition available. + Details
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- Definition Employee vesting percentage. + References No definition available. + Details
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- Definition Defined contribution plan employer contribution as percentage of eligible compensation. + References No definition available. + Details
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- Definition Health reimbursement account balance. + References No definition available. + Details
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- Definition Health reimbursement accounts funding. + References No definition available. + Details
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- Definition Minimum years of service required for full vesting. + References No definition available. + Details
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- Definition Reduction in expenses due to changes in plan for other postretirement benefits. + References No definition available. + Details
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- Definition Amount of commitment made to pay deferred cash remuneration. + References No definition available. + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation. + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition Description of target allocation percentages, or range of percentages, considering the major categories of plan assets as of the latest statement of financial position presented (on a weighted-average basis for employers with more than one plan) that are pertinent to an understanding of the plan investment policies and strategies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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