XML 56 R38.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value of Financial Instruments - Financial Instruments Measured and Carried at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Carrying Amount |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | $ 7,861,063 | $ 7,663,469
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 286 | 158
Other policyholder funds, embedded derivatives | 67,995 | 59,393
Carrying Amount | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,578,585 | 7,456,708
Carrying Amount | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 104,087 | 44,918
Carrying Amount | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 623,064 | 614,891
Carrying Amount | Other, including U.S. Treasury Securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 606,350 | 467,143
Carrying Amount | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,817,220 | 1,769,397
Carrying Amount | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 100,046 | 98,669
Carrying Amount | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,827,608 | 2,810,221
Carrying Amount | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,604,297 | 1,696,387
Carrying Amount | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 156,909 | 141,649
Carrying Amount | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 21,482 | 20,194
Fair Value |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,861,063 | 7,663,469
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 286 | 158
Other policyholder funds, embedded derivatives | 67,995 | 59,393
Fair Value | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,578,585 | 7,456,708
Fair Value | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 104,087 | 44,918
Fair Value | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 623,064 | 614,891
Fair Value | Other, including U.S. Treasury Securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 606,350 | 467,143
Fair Value | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,817,220 | 1,769,397
Fair Value | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 100,046 | 98,669
Fair Value | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,827,608 | 2,810,221
Fair Value | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,604,297 | 1,696,387
Fair Value | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 156,909 | 141,649
Fair Value | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 21,482 | 20,194
Fair Value | Level 1 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 235,251 | 169,962
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 1 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 29,317 | 27,163
Fair Value | Level 1 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 104,087 | 44,167
Fair Value | Level 1 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Other, including U.S. Treasury Securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 14,341 | 13,631
Fair Value | Level 1 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 14,976 | 13,532
Fair Value | Level 1 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 1 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 101,847 | 98,632
Fair Value | Level 1 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 2 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,379,307 | 7,281,403
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 286 | 158
Other policyholder funds, embedded derivatives | 0 | 0
Fair Value | Level 2 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 7,302,769 | 7,218,198
Fair Value | Level 2 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 2 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 619,479 | 611,476
Fair Value | Level 2 | Other, including U.S. Treasury Securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 592,009 | 453,512
Fair Value | Level 2 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,768,097 | 1,722,900
Fair Value | Level 2 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 100,046 | 98,669
Fair Value | Level 2 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 2,735,580 | 2,736,498
Fair Value | Level 2 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 1,487,558 | 1,595,143
Fair Value | Level 2 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 55,056 | 43,011
Fair Value | Level 2 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 21,482 | 20,194
Fair Value | Level 3 |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 246,505 | 212,104
Financial Liabilities |  |
Investment contract and life policy reserves, embedded derivatives | 0 | 0
Other policyholder funds, embedded derivatives | 67,995 | 59,393
Fair Value | Level 3 | Recurring |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 246,499 | 211,347
Fair Value | Level 3 | Short-term investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 751
Fair Value | Level 3 | Mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 3,585 | 3,415
Fair Value | Level 3 | Other, including U.S. Treasury Securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 3 | Municipal bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 49,123 | 46,497
Fair Value | Level 3 | Foreign government bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 0 | 0
Fair Value | Level 3 | Corporate bonds |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 77,052 | 60,191
Fair Value | Level 3 | Other mortgage-backed securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 116,739 | 101,244
Fair Value | Level 3 | Equity securities |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | 6 | 6
Fair Value | Level 3 | Other investments |  |
U.S. Government and federally sponsored agency obligations: |  |
Investments | $ 0 | $ 0

X
- Definition Fair value disclosure of accrued obligation to policyholders that relates to insured events under other insurance contracts. + References No definition available. + Details
Name: | hmn_LiabilityForFuturePolicyBenefitsDerivativeInstrumentsFairValueDisclosure
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of the liability as of the policyholders for funds held that are returnable under the terms of insurance contracts that were not separately reported. + References No definition available. + Details
Name: | hmn_OtherPolicyholderFundsDerivativeInstrumentsFairValueDisclosure
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition U.S. government and federally sponsored agency obligations. + References No definition available. + Details
Name: | hmn_UsGovernmentAndFederallySponsoredAgencyObligationsAbstract
Namespace Prefix: | hmn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt and equity 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=65884222&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 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 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=66010992&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_CarryingReportedAmountFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_ShortTermInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=hmn_OtherIncludingUsTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ForeignGovernmentDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MortgageBackedSecuritiesOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=hmn_OtherInvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |