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Reinsurance and Catastrophes (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance Recoverables | $ 53,332 us-gaap_ReinsuranceRecoverables | $ 24,502 us-gaap_ReinsuranceRecoverables
Reinsurance companies [Member] |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance Recoverables | 7,772 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = hmn_PropertyLiabilityAndCasualtyInsuranceReinsuranceCompaniesMember | 10,152 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = hmn_PropertyLiabilityAndCasualtyInsuranceReinsuranceCompaniesMember
State insurance facilities [Member] |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance Recoverables | 35,968 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = hmn_PropertyLiabilityAndCasualtyInsuranceStateInsuranceFacilitiesMember | 3,955 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = hmn_PropertyLiabilityAndCasualtyInsuranceStateInsuranceFacilitiesMember
Life and health [Member] |  |
Summary of reinsurance recoverable on unpaid insurance reserves |  |
Reinsurance Recoverables | $ 9,592 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndHealthMember | $ 10,395 us-gaap_ReinsuranceRecoverables / us-gaap_StatementBusinessSegmentsAxis = hmn_LifeAndHealthMember

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- Definition Amount after valuation allowance recoverable including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 6 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 Reference 3: 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),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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