XML 52 R37.htm IDEA: XBRL DOCUMENT
v3.19.2

Investments - Summary of Fair Value and Amortized Costs (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | $ 5,241,755 | $ 7,373,911
Fair Value | 5,534,270 | 7,515,318
Federal National Mortgage Association Certificates and Obligations (FNMA) |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 370,182 | 441,308
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 256,531 | 417,308
Government National Mortgage Association Certificates and Obligations (GNMA) |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Fair Value | 79,141 | 96,466
Total Fixed Maturity Securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 5,241,755 | 7,373,911
Unrealized Gains | 305,559 | 249,085
Unrealized Losses | 13,044 | 107,678
Fair Value | 5,534,270 | 7,515,318
Mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 550,059 | 778,038
Unrealized Gains | 37,900 | 22,724
Unrealized Losses | 1,201 | 13,321
Fair Value | 586,758 | 787,441
Other, including U.S. Treasury securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 546,396 | 835,096
Unrealized Gains | 20,574 | 16,127
Unrealized Losses | 533 | 17,681
Fair Value | 566,437 | 833,542
Municipal bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 1,472,794 | 1,884,313
Unrealized Gains | 127,700 | 133,150
Unrealized Losses | 801 | 13,494
Fair Value | 1,599,693 | 2,003,969
Foreign government bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 45,303 | 83,343
Unrealized Gains | 2,064 | 2,321
Unrealized Losses | 0 | 760
Fair Value | 47,367 | 84,904
Corporate bonds |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 1,226,962 | 2,054,105
Unrealized Gains | 96,535 | 64,296
Unrealized Losses | 2,211 | 38,891
Fair Value | 1,321,286 | 2,079,510
Other mortgage-backed securities |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost | 1,400,241 | 1,739,016
Unrealized Gains | 20,786 | 10,467
Unrealized Losses | 8,298 | 23,531
Fair Value | $ 1,412,729 | $ 1,725,952

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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