XML 67 R52.htm IDEA: XBRL DOCUMENT
v3.19.2

Derivative Instruments - Notional and Fair Value Amounts of Derivative Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative [Line Items] |  |
Notional Amount | $ 300,400 | $ 278,200
Fair Value | 8,753 | 2,647
Bank of America, N.A. |  |
Derivative [Line Items] |  |
Notional Amount | 156,800 | 144,500
Fair Value | 3,560 | 870
Barclays Bank PLC |  |
Derivative [Line Items] |  |
Notional Amount | 72,500 | 28,500
Fair Value | 1,696 | 247
Citigroup Inc. |  |
Derivative [Line Items] |  |
Notional Amount | 0 | 0
Fair Value | 0 | 0
Credit Suisse International |  |
Derivative [Line Items] |  |
Notional Amount | 16,100 | 16,100
Fair Value | 295 | 55
Societe Generale |  |
Derivative [Line Items] |  |
Notional Amount | 55,000 | 89,100
Fair Value | $ 3,202 | $ 1,475

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
Name: | us-gaap_DerivativeAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | hmn_CounterPartyAxis=hmn_BankOfAmericaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hmn_CounterPartyAxis=hmn_BarclaysBankPlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hmn_CounterPartyAxis=hmn_CitigroupIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hmn_CounterPartyAxis=hmn_CreditSuisseInternationalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | hmn_CounterPartyAxis=hmn_SocieteGeneraleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |