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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