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Pension Plans and Other Postretirement Benefits (Details Textual) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2012 Age | Sep. 30, 2011
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |
Effective Jan. 1, 2007, minimum age at which previous group health benefits were eliminated | 65 |
Funding of health reimbursement accounts | $ 133 | $ 153

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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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- Definition Effective January 1, 2007, the minimum age at which the Company eliminated the previous group health insurance benefits for retirees, including elimination of pharmacy benefits for Medicare eligible retirees, and established a Health reimbursement Account ("HRA") for each eligible participant. + References No definition available. + Details
Name: | hmn_MinimumAgePreviousGroupHealthBenefitsEliminated
Namespace Prefix: | hmn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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