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Supplementary Data on Cash Flows (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Non Cash Financing Charges	$ 45

X

- Definition

Amount of non cash financing charges due to redemption of debt.

+ References

No definition available.

+ Details

Name:	hmn_NonCashFinancingCharges
Namespace Prefix:	hmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration