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Fair Value of Financial Instruments - Financial Instrument Not Carried at Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Level 1 |  |
Investments |  |
Other investments | $ 0 | $ 0
Financial Liabilities |  |
Investment contract and life policy reserves, fixed annuity contracts | 0 | 0
Investment contract and life policy reserves, account values on life contracts | 0 | 0
Other policyholder funds | 0 | 0
Long-term debt | 0 | 0
Level 2 |  |
Investments |  |
Other investments | 0 | 0
Financial Liabilities |  |
Investment contract and life policy reserves, fixed annuity contracts | 0 | 0
Investment contract and life policy reserves, account values on life contracts | 0 | 0
Other policyholder funds | 575,928 | 575,622
Long-term debt | 302,695 | 311,315
Level 3 |  |
Investments |  |
Other investments | 159,019 | 159,575
Financial Liabilities |  |
Investment contract and life policy reserves, fixed annuity contracts | 4,399,614 | 4,366,334
Investment contract and life policy reserves, account values on life contracts | 89,761 | 88,620
Other policyholder funds | 64,794 | 67,906
Long-term debt | 0 | 0
Carrying Amount |  |
Investments |  |
Other investments | 154,327 | 154,898
Financial Liabilities |  |
Investment contract and life policy reserves, fixed annuity contracts | 4,498,302 | 4,452,972
Investment contract and life policy reserves, account values on life contracts | 84,163 | 82,911
Other policyholder funds | 640,722 | 643,528
Long-term debt | 297,603 | 297,469
Fair Value |  |
Investments |  |
Other investments | 159,019 | 159,575
Financial Liabilities |  |
Investment contract and life policy reserves, fixed annuity contracts | 4,399,614 | 4,366,334
Investment contract and life policy reserves, account values on life contracts | 89,761 | 88,620
Other policyholder funds | 640,722 | 643,528
Long-term debt | $ 302,695 | $ 311,315

X
- Definition The fair value of accrued obligation to policyholders that relates to insured events under individual and group annuities and supplementary insurance contracts. + References No definition available. + Details
Name: | hmn_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuitiesAndSupplementaryContractsFairValue
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Liability for policyholder account balances life fair value. + References No definition available. + Details
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Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair Value of the liability as of the balance sheet date to the policyholders for funds held that are returnable under the terms of insurance contracts that were not separately reported. + References No definition available. + Details
Name: | hmn_OtherPolicyholderFundsFairValueDisclosure
Namespace Prefix: | hmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Balance Type: | na
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X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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