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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

X

- 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:	instant

X

- 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:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

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Namespace Prefix:	hmn_
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Balance Type:	na
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