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Segment Information (Details Textual) | 9 Months Ended
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Sep. 30, 2012 Segment
Segment Information (Textual) [Abstract] |
Business segments | 4

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- Definition Company's business segments. + References No definition available. + Details
Name: | hmn_BusinessSegments
Namespace Prefix: | hmn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | hmn_SegmentInformationTextualAbstract
Namespace Prefix: | hmn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration