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Reinsurance and Catastrophes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Losses Incurred For Catastrophe Claims Carrying Amount | $ 60,043 | $ 44,429 | $ 37,500
Percentage Of Coverage For Catastrophe Losses Above Retention Amount | 95.00% |  |
Coverage Above Retention Per Occurrence Under Layer One Catastrophe Reinsurance | $ 25,000 |  |
Retention Base Amount Per Occurrence Under Layer One | 25,000 |  |
Coverage Above Retention Per Occurrence Under Layer Two Catastrophe Reinsurance | 40,000 |  |
Retention Base Amount Per Occurrence Under Layer Two | 50,000 |  |
Coverage Above Retention Per Occurrence Under Layer Three Catastrophe Reinsurance | 85,000 |  |
Retention Base Amount Per Occurrence Under Layer Three | 90,000 |  |
Amount Of Maximum Individual Life Insurance Risk Retained | 300 |  |
Reinsured Amount Of Each Loss Above Retention In Clash Event | 20,000 |  |
Amount Of Property Recovery Related To Risk Losses | $ 8,200 |  |
Percentage of Life Reinsured Catastrophe Risk In Excess Specified Retention Per Occurrence Amount | 100.00% |  |
Maximum [Member] |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Retention Amount Per Occurrence Related To Catastrophe Losses | $ 175,000 |  |
Amount Of Maximum Group Life Policy Insurance Risk Retained | 125 |  |
Liability coverages, Company reinsured each loss above a retention per occurrence | 5,000 |  |
Amount of Life Catastrophe Risk in Excess of Per Occurrence | 35,000 |  |
Maximum [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Reinsured Amount Of Each Property Loss Above Retention Per Occurrence | 5,000 |  |
Minimum [Member] |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Retention Amount Per Occurrence Related To Catastrophe Losses | 25,000 |  |
Amount Life Catastrophe Risk Retention Per Occurrence | 1,000 |  |
Minimum [Member] | Property, Liability and Casualty Insurance Product Line [Member] |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Retention Amount Of Each Property Loss Per Occurrence | $ 900 |  |

X
- Definition Amount life catastrophe risk retention per occurrence. + References No definition available. + Details
Name: | hmn_AmountLifeCatastropheRiskRetentionPerOccurrence
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of life catastrophe risk in excess of per occurrence. + References No definition available. + Details
Name: | hmn_AmountOfLifeCatastropheRiskInExcessOfPerOccurrence
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of maximum group life policy insurance risk retained. + References No definition available. + Details
Name: | hmn_AmountOfMaximumGroupLifePolicyInsuranceRiskRetained
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of maximum individual life insurance risk retained. + References No definition available. + Details
Name: | hmn_AmountOfMaximumIndividualLifeInsuranceRiskRetained
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of property recovery related to risk losses. + References No definition available. + Details
Name: | hmn_AmountOfPropertyRecoveryRelatedToRiskLosses
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Coverage provided above retention per occurrence under layer one of catastrophe excess of loss reinsurance coverage. + References No definition available. + Details
Name: | hmn_CoverageAboveRetentionPerOccurrenceUnderLayerOneCatastropheReinsurance
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Coverage provided above retention per occurrence under layer three of catastrophe excess of loss reinsurance coverage. + References No definition available. + Details
Name: | hmn_CoverageAboveRetentionPerOccurrenceUnderLayerThreeCatastropheReinsurance
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Coverage provided above retention per occurrence under layer two of catastrophe excess of loss reinsurance coverage. + References No definition available. + Details
Name: | hmn_CoverageAboveRetentionPerOccurrenceUnderLayerTwoCatastropheReinsurance
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Net catastrophe losses incurred as of the balance sheet date for the specific conflagration, earthquake, windstorm, explosion, or similar event. + References No definition available. + Details
Name: | hmn_LossesIncurredForCatastropheClaimsCarryingAmount
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percentage of coverage for catastrophe losses above retention amount. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of life reinsured catastrophe risk in excess specified retention per occurrence amount. + References No definition available. + Details
Name: | hmn_PercentageOfLifeReinsuredCatastropheRiskInExcessSpecifiedRetentionPerOccurrenceAmount
Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Reinsured amount of each loss above retention in clash event. + References No definition available. + Details
Name: | hmn_ReinsuredAmountOfEachLossAboveRetentionInClashEvent
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Reinsured amount of each property coverage loss above retention per occurrence. + References No definition available. + Details
Name: | hmn_ReinsuredAmountOfEachPropertyLossAboveRetentionPerOccurrence
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Retention amount of each liability coverage loss per occurrence. + References No definition available. + Details
Name: | hmn_RetentionAmountOfEachLiabilityLossPerOccurrence
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Retention amount of each property coverage loss per occurrence. + References No definition available. + Details
Name: | hmn_RetentionAmountOfEachPropertyLossPerOccurrence
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Retention amount per occurrence related to catastrophe losses. + References No definition available. + Details
Name: | hmn_RetentionAmountPerOccurrenceRelatedToCatastropheLosses
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Retention base amount per occurrence under layer one. + References No definition available. + Details
Name: | hmn_RetentionBaseAmountPerOccurrenceUnderLayerOne
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Retention base amount per occurrence under layer three. + References No definition available. + Details
Name: | hmn_RetentionBaseAmountPerOccurrenceUnderLayerThree
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Retention base amount per occurrence under layer two. + References No definition available. + Details
Name: | hmn_RetentionBaseAmountPerOccurrenceUnderLayerTwo
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ProductOrServiceAxis=us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
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Period Type: |