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Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Income tax (asset) liability
Current	$ (3,832)	$ 1,000
Deferred	$ 205,699	$ 201,208

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- Definition

Current income tax assets liabilities.

+ References

No definition available.

+ Details

Name:	hmn_CurrentIncomeTaxAssetsLiabilities
Namespace Prefix:	hmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Deferred income tax assets liabilities.

+ References

No definition available.

+ Details

Name:	hmn_DeferredIncomeTaxAssetsLiabilities
Namespace Prefix:	hmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	hmn_IncomeTaxAssetLiabilityAbstract
Namespace Prefix:	hmn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration