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Investments (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Investments (Textual) [Abstract] |  |
Fair value of issued securities | $ 6,893,090 us-gaap_AvailableForSaleSecuritiesDebtSecurities | $ 6,009,573 us-gaap_AvailableForSaleSecuritiesDebtSecurities
Investments (Additional Textual) [Abstract] |  |
Fair value of securities transferred | 0 hmn_Repurchaseagreementsecuritiestransferredfairvalue | 24,791 hmn_Repurchaseagreementsecuritiestransferredfairvalue
Obligation for securities sold under agreement to repurchase, including accrued interest | 0 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase | 25,864 us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Cash received in an amount equal to fair value of securities transferred | 95.00%hmn_Repurchaseagreementminimumpercentageoffairvalueofsecuritiesreceived |
Federal Home Loan Bank Funding Agreements | 500,000 hmn_FederalHomeLoanBankFundingAgreements | 250,000 hmn_FederalHomeLoanBankFundingAgreements
Investment Grade Rate | 80.00%hmn_InvestmentGradeRate |
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 302,222 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember | 336,193 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 432,432 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember | 427,172 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Investments (Textual) [Abstract] |  |
Fair value of issued securities | 137,867 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember | 126,245 us-gaap_AvailableForSaleSecuritiesDebtSecurities / us-gaap_InvestmentTypeAxis = us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Federal Home Loan Bank [Member] | Fixed Maturities [Member] |  |
Investments (Additional Textual) [Abstract] |  |
Securities Deposited Fair Value | 18,361 hmn_SecuritiesDepositedFairValue / us-gaap_InvestmentTypeAxis = hmn_FederalHomeLoanBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | 17,967 hmn_SecuritiesDepositedFairValue / us-gaap_InvestmentTypeAxis = hmn_FederalHomeLoanBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember
Securities Deposited As Collateral | $ 539,235 hmn_SecuritiesDepositedAsCollateral / us-gaap_InvestmentTypeAxis = hmn_FederalHomeLoanBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember | $ 274,437 hmn_SecuritiesDepositedAsCollateral / us-gaap_InvestmentTypeAxis = hmn_FederalHomeLoanBankMember / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_FixedMaturitiesMember

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- Definition Represents the federal home loan bank funding agreements. + References No definition available. + Details
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- Definition Investment grade rating during the period. + References No definition available. + Details
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- Definition Repurchase agreement minimum percentage of fair value of securities received + References No definition available. + Details
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- Definition Repurchase agreement securities transferred fair value. + References No definition available. + Details
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- Definition Represents the fair value of securities deposited as collateral. + References No definition available. + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 1 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=45278096&loc=d3e9760-107771 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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