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Segment Information (Details Textual) | 6 Months Ended
--- | ---
Jun. 30, 2012 Segment
Segment Information [Abstract] |
Business segments | 4

X
- 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

X
- Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration