XML 54 R30.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost |  | $ 7,173,235 | $ 7,152,127
Amortized Cost or Cost, Equity securities |  | 143,203 | 134,013
Unrealized Investment Gains |  | 392,286 | 374,991
Unrealized Investment Losses |  | 54,771 | 70,410
Fair Value and Fair Value, Equity |  | 7,510,750 | 7,456,708
Investment Fair Value, Equity securities |  | 156,975 | 141,649
OTTI in AOCI | [1] | 1,538 | 1,618
Mortgage-backed securities [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost | [2] | 581,346 | 587,355
Unrealized Investment Gains | [2] | 33,904 | 34,256
Unrealized Investment Losses | [2] | 5,443 | 6,720
Fair Value and Fair Value, Equity | [2] | 609,807 | 614,891
OTTI in AOCI | [1],[2] | 0 | 0
Other, including U.S. Treasury Securities [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost | [2] | 520,718 | 458,745
Unrealized Investment Gains | [2] | 19,809 | 18,518
Unrealized Investment Losses | [2] | 9,219 | 10,120
Fair Value and Fair Value, Equity | [2] | 531,308 | 467,143
OTTI in AOCI | [1],[2] | 0 | 0
Municipal bonds [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost |  | 1,647,314 | 1,648,252
Unrealized Investment Gains |  | 148,319 | 143,733
Unrealized Investment Losses |  | 18,206 | 22,588
Fair Value and Fair Value, Equity |  | 1,777,427 | 1,769,397
OTTI in AOCI | [1] | 0 | 0
Foreign government bonds [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost |  | 93,845 | 93,864
Unrealized Investment Gains |  | 5,897 | 5,102
Unrealized Investment Losses |  | 56 | 297
Fair Value and Fair Value, Equity |  | 99,686 | 98,669
OTTI in AOCI | [1] | 0 | 0
Corporate bonds [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost |  | 2,683,746 | 2,672,818
Unrealized Investment Gains |  | 162,602 | 152,229
Unrealized Investment Losses |  | 9,175 | 14,826
Fair Value and Fair Value, Equity |  | 2,837,173 | 2,810,221
OTTI in AOCI | [1] | 0 | 0
Other mortgage-backed securities [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost |  | 1,646,266 | 1,691,093
Unrealized Investment Gains |  | 21,755 | 21,153
Unrealized Investment Losses |  | 12,672 | 15,859
Fair Value and Fair Value, Equity |  | 1,655,349 | 1,696,387
OTTI in AOCI | [1] | 1,538 | 1,618
Equity securities [Member] |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |
Amortized Cost or Cost, Equity securities | [3] | 143,203 | 134,013
Unrealized Investment Gains | [3] | 15,743 | 13,210
Unrealized Investment Losses | [3] | 1,971 | 5,574
Investment Fair Value, Equity securities | [3] | 156,975 | 141,649
OTTI in AOCI | [1],[3] | $ 0 | $ 0
[1] | Related to securities for which an unrealized loss was bifurcated to distinguish the credit-related portion and the portion driven by other market factors. Represents the amount of OTTI losses in AOCI which was not included in earnings; amounts also include net unrealized investment gains and losses on such impaired securities relating to changes in the fair value of those securities subsequent to the impairment measurement date.
[2] | Fair value includes securities issued by Federal National Mortgage Association (“FNMA”) of $283,039 and $272,668; Federal Home Loan Mortgage Corporation (“FHLMC”) of $373,017 and $378,683; and Government National Mortgage Association (“GNMA”) of $112,065 and $115,627 as of March 31, 2017 and December 31, 2016, respectively.
[3] | Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

X
- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: 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=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleEquitySecuritiesAmortizedCostBasis
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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=65884222&loc=d3e22054-111558 Reference 2: 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 Reference 3: 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=73527792&loc=d3e27161-111563 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
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of equity securities categorized neither as held-to-maturity nor as 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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
Name: | us-gaap_AvailableForSaleSecuritiesEquitySecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of other than temporary impairment (OTTI) on investment in available-for-sale debt security, recognized in other comprehensive loss, attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25362-111560 + Details
Name: | us-gaap_OtherThanTemporaryImpairmentLossesInvestmentsPortionInOtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParentAvailableforsaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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: |