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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred policy acquisition costs asset by segment |  |
Total | $ 215,082 us-gaap_DeferredPolicyAcquisitionCosts | $ 245,355 us-gaap_DeferredPolicyAcquisitionCosts
Annuity [Member] |  |
Deferred policy acquisition costs asset by segment |  |
Total | 143,522 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = hmn_AnnuitySegmentMember | 170,749 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = hmn_AnnuitySegmentMember
Life [Member] |  |
Deferred policy acquisition costs asset by segment |  |
Total | 44,400 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_LifeInsuranceSegmentMember | 48,558 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_LifeInsuranceSegmentMember
Property and casualty [Member] |  |
Deferred policy acquisition costs asset by segment |  |
Total | $ 27,160 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember | $ 26,048 us-gaap_DeferredPolicyAcquisitionCosts / us-gaap_StatementBusinessSegmentsAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember

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- Definition Net amount of deferred policy acquisition costs capitalized on contracts remaining in force as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6487548&loc=d3e32546-158582 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755678&loc=d3e11446-158418 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6481648&loc=d3e11198-158413 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),7) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 7 + Details
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