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Reinsurance and Catastrophes (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reinsurance And Catastrophes (Textual) [Abstract] |  |  |
Liability coverages, Company reinsured each loss above a retention in a clash event | $ 20,000 hmn_ReinsuredAmountOfEachLossAboveRetentionInClashEvent |  |
Reinsurance and Catastrophes (Additional Textual) [Abstract] |  |  |
Losses incurred from Natural Catastrophes | 37,500 hmn_LossesIncurredForCatastropheClaimsCarryingAmount | 40,225 hmn_LossesIncurredForCatastropheClaimsCarryingAmount | 43,319 hmn_LossesIncurredForCatastropheClaimsCarryingAmount
Percentage of coverage for catastrophe losses above retention amount | 95.00%hmn_PercentageOfCoverageForCatastropheLossesAboveRetentionAmount |  |
Coverage provided above retention per occurrence under layer one of catastrophe excess of loss reinsurance coverage | 25,000 hmn_CoverageAboveRetentionPerOccurrenceUnderLayerOneCatastropheReinsurance |  |
Coverage provided above retention per occurrence under layer two of catastrophe excess of loss reinsurance coverage | 40,000 hmn_CoverageAboveRetentionPerOccurrenceUnderLayerTwoCatastropheReinsurance |  |
Coverage provided above retention per occurrence under layer three of catastrophe excess of loss reinsurance coverage | 85,000 hmn_CoverageAboveRetentionPerOccurrenceUnderLayerThreeCatastropheReinsurance |  |
Retention base amount per occurrence under layer one of catastrophe excess of loss reinsurance coverage | 25,000 hmn_RetentionBaseAmountPerOccurrenceUnderLayerOne |  |
Retention base amount per occurrence under layer two of catastrophe excess of loss reinsurance coverage | 50,000 hmn_RetentionBaseAmountPerOccurrenceUnderLayerTwo |  |
Retention base amount per occurrence under layer three of catastrophe excess of loss reinsurance coverage | 90,000 hmn_RetentionBaseAmountPerOccurrenceUnderLayerThree |  |
Amount of property recovery per risk losses from the same occurrence in any one event | 4,800 hmn_AmountOfPropertyRecoveryRelatedToRiskLosses |  |
Maximum individual life insurance risk retained on any individual life | 300 hmn_AmountOfMaximumIndividualLifeInsuranceRiskRetained |  |
Percent of hurricane losses reinsured by the Company's predominant insurance subsidiary for Property and casualty business written in Florida | 90.00%hmn_PercentOfReinsuranceOfPropertyAndCasualtyBusinessBySubsidiary |  |
Percent of life catastrophe risk reinsured | 100.00%hmn_PercentageOfReinsuredCatastropheRiskInExcessSpecifiedRetentionPerOccurrenceAmount |  |
Maximum [Member] |  |  |
Reinsurance And Catastrophes (Textual) [Abstract] |  |  |
Retention per occurrence | 175,000 hmn_RetentionAmountPerOccurrenceRelatedToCatastropheLosses / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Liability coverages, Company reinsured each loss above a retention per occurrence | 2,500 hmn_RetentionAmountOfEachLiabilityLossPerOccurrence / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Retained on each group life policy depending on the type of coverage | 125 hmn_AmountOfMaximumGroupLifePolicyInsuranceRiskRetained / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Maximum reinsured 100% above retention per occurrence for life catastrophe risk | 35,000 hmn_AmountOfRiskInExcessOfPerOccurrence / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Estimated retention by the Company's predominant insurance subsidiary for property and casualty business written in Florida based on FHCF's financial resources | 15,100 hmn_EstimatedRetentionAmount / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum [Member] |  |  |
Reinsurance And Catastrophes (Textual) [Abstract] |  |  |
Retention per occurrence | 25,000 hmn_RetentionAmountPerOccurrenceRelatedToCatastropheLosses / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Liability coverages, Company reinsured each loss above a retention per occurrence | 900 hmn_RetentionAmountOfEachLiabilityLossPerOccurrence / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Retained on each group life policy depending on the type of coverage | 100 hmn_AmountOfMaximumGroupLifePolicyInsuranceRiskRetained / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Life catastrophe risk retention per occurrence | 1,000 hmn_AmountLifeCatastropheRiskRetentionPerOccurrence / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Estimated retention by the Company's predominant insurance subsidiary for property and casualty business written in Florida based on FHCF's financial resources | 4,100 hmn_EstimatedRetentionAmount / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Property And Casualty Segment [Member] | Maximum [Member] |  |  |
Reinsurance And Catastrophes (Textual) [Abstract] |  |  |
Property coverages, amount reinsured above a retention per occurrence | 2,500 hmn_ReinsuredAmountOfEachPropertyLossAboveRetentionPerOccurrence / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember |  |
Property And Casualty Segment [Member] | Minimum [Member] |  |  |
Reinsurance And Catastrophes (Textual) [Abstract] |  |  |
Property coverages, Company reinsured each loss above a retention per occurrence | $ 900 hmn_RetentionAmountOfEachPropertyLossPerOccurrence / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_PropertyLiabilityAndCasualtyInsuranceSegmentMember |  |

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 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: | credit
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: | credit
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 The amount reinsured 100% above retention for life catastrophe risks. + References No definition available. + Details
Name: | hmn_AmountOfRiskInExcessOfPerOccurrence
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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 The estimated retention of hurricane losses in Florida by the Company's predominant insurance subsidiary for property and casualty business written in Florida, based on the FHCF's financial resources. + References No definition available. + Details
Name: | hmn_EstimatedRetentionAmount
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
Name: | hmn_PercentageOfCoverageForCatastropheLossesAboveRetentionAmount
Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Percent of hurricane losses reinsured by the Company's predominant insurance subsidiary for property and casualty business written in Florida. + References No definition available. + Details
Name: | hmn_PercentOfReinsuranceOfPropertyAndCasualtyBusinessBySubsidiary
Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | hmn_ReinsuranceAndCatastrophesAdditionalTextualAbstract
Namespace Prefix: | hmn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | hmn_ReinsuranceAndCatastrophesTextualAbstract
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_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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