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Pension Plans and Other Postretirement Benefits (Details Textual) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |
Health reimbursement accounts funding | $ 132 | $ 90
Other Postretirement Benefit Plan, Defined Benefit [Member] |  |
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |
Defined Benefit Plan, Other Changes | $ 556 | $ 186

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- Definition Health reimbursement accounts funding. + References No definition available. + Details
Name: | hmn_HealthReimbursementAccountsFunding
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | hmn_PensionPlansAndOtherPostretirementBenefitsTextualAbstract
Namespace Prefix: | hmn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanOtherChanges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration