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Property and Casualty Unpaid Claims and Claim Expenses - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Insurance Loss Reserves [Abstract] |  |  |
Benefits, claims and settlement expenses | $ 585,068 | $ 637,560 | $ 582,306
Automobile liability coverage percent reserves | 80.00% |  |
Short tail coverage reserves as a percentage of total reserves | 20.00% |  |
Long tail coverage reserves as percentage of reserves | 80.00% |  |
Percentage of losses incurred | 99.00% |  |
Potential variability of property and casualty loss reserves | 6.00% |  |
Probability of other possible outcomes possible impact on net income | $ 13,000 |  |
Favorable development of total reserves for property and casualty claims occurring in prior years | $ 7,500 | $ 300 | $ 2,700

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- Definition Automobile liability coverage reserves as a percentage of total reserves. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The reduction in the estimate of the amount needed to settle claims relating to property and casualty insured events that have occurred in prior years. + 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 Long tail coverage reserves as a percentage of total reserves. + References No definition available. + Details
Name: | hmn_LongTailCoverageReservesAsPercentageOfReserves
Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of losses represented by auto liability and auto physical damage. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Equated Net Income impact (plus or minus) of potential percentage variability (plus or minus) of property and casualty loss reserves within a reasonable probability of other possible outcomes. + References No definition available. + Details
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- Definition Short tail coverage reserves as a percentage of total reserves. + References No definition available. + Details
Name: | hmn_ShortTailCoverageReservesAsPercentageOfTotalReserves
Namespace Prefix: | hmn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InsuranceLossReservesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.5) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6811-158387 + Details
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