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Pension Plans and Other Postretirement Benefits (Details Textual) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012
Pension Plans and Other Postretirement Benefits (Textual) [Abstract] |  |
Effective Jan. 1, 2007, minimum age at which previous group health benefits were eliminated | 65 years |
Health reimbursement accounts funding | $ 35 | $ 40
Minimum funding requirement for 2013 | $ 0 |

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

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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
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Namespace Prefix: | hmn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum funding requirements for retirement plans. + References No definition available. + Details
Name: | hmn_MinimumFundingRequirementsForRetirementPlans
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:stringItemType
Balance Type: | na
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