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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