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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, 2012 | Jun. 30, 2011
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |
Funding of health reimbursement accounts | $ 88 | $ 116

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- Definition Funding health reimbursement account. + References No definition available. + Details
Name: | hmn_FundingHealthReimbursementAccount
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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