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Reinsurance and Catastrophes - Narrative (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Losses incurred for catastrophe claims, carrying amount | $ 107,345,000 | $ 61,814,000 | $ 60,043,000
Percentage of coverage for catastrophe losses above retention amount, layer one | 95.00% |  |
Coverage above retention per occurrence under layer one catastrophe reinsurance | $ 25,000,000 |  |
Retention base amount per occurrence under layer one | 25,000,000 |  |
Coverage above retention per occurrence under layer two catastrophe reinsurance | 40,000,000 |  |
Retention base amount per occurrence under layer two | 50,000,000 |  |
Coverage above retention per occurrence under layer three catastrophe reinsurance | 85,000,000 |  |
Retention base amount per occurrence under layer three | 90,000,000 |  |
Reinsured amount of each loss above retention in clash event | 20,000,000 |  |
Amount of maximum individual life insurance risk retained | 300,000 |  |
Amount of property recovery related to risk losses | $ 8,000,000 |  |
Percentage of life reinsured catastrophe risk in excess specified retention per occurrence amount | 100.00% |  |
Maximum |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Retention amount per occurrence related to catastrophe losses, layer one | $ 175,000,000 |  |
Amount of maximum group life policy insurance risk retained | 125,000 |  |
Liability coverages, Company reinsured each loss above a retention per occurrence | 5,000,000 |  |
Amount of life catastrophe risk in excess of per occurrence | 35,000,000 |  |
Maximum | Property and Casualty |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Reinsured amount of each property loss above retention per occurrence | 5,000,000 |  |
Minimum |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Retention amount per occurrence related to catastrophe losses, layer one | 25,000,000 |  |
Amount of maximum group life policy insurance risk retained | 100,000 |  |
Liability coverages, Company reinsured each loss above a retention per occurrence | 1,000,000 |  |
Amount life catastrophe risk retention per occurrence | 1,000,000 |  |
Minimum | Property and Casualty |  |  |
Reinsurance Recoverable on Unpaid Insurance Reserves [Line Items] |  |  |
Retention amount of each property loss per occurrence | $ 1,000,000 |  |

X
- Definition Amount life catastrophe risk retention per occurrence. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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

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

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- Definition Amount of property recovery related to risk losses. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Coverage provided above retention per occurrence under layer one of catastrophe excess of loss reinsurance coverage. + References No definition available. + Details
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- Definition Coverage provided above retention per occurrence under layer three of catastrophe excess of loss reinsurance coverage. + References No definition available. + Details
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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
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- Definition Percentage of coverage for catastrophe losses above retention amount. + References No definition available. + Details
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- Definition Percentage of life reinsured catastrophe risk in excess specified retention per occurrence amount. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Reinsured amount of each loss above retention in clash event. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
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- Definition Reinsured amount of each property coverage loss above retention per occurrence. + References No definition available. + Details
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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
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- Definition Retention amount of each property coverage loss per occurrence. + References No definition available. + Details
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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
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
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- Definition Retention base amount per occurrence under layer one. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Retention base amount per occurrence under layer three. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Retention base amount per occurrence under layer two. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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- Details
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