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Derivative Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments, Notional Amount | 66,600 invest_DerivativeNotionalAmount |  | $ 0 invest_DerivativeNotionalAmount
Derivative Instruments, Fair Value | 2,458 us-gaap_DebtInstrumentFairValue |  | 0 us-gaap_DebtInstrumentFairValue
Bank of America, N.A. [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments, Notional Amount | 8,700 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember |  | 0 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember
Derivative Instruments, Fair Value | 439 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember |  | 0 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember
Bank of America, N.A. [Member] | Moody's, A2 Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A2 | [1] |
Bank of America, N.A. [Member] | Standard & Poor's, A Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A | [1] |
Barclays Bank PLC [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments, Notional Amount | 5,000 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember |  | 0 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember
Derivative Instruments, Fair Value | 70 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember |  | 0 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember
Barclays Bank PLC [Member] | Moody's, A2 Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A2 |  |
Barclays Bank PLC [Member] | Standard & Poor's, A Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A |  |
Credit Suisse International [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments, Notional Amount | 27,500 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember |  | 0 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember
Derivative Instruments, Fair Value | 1,193 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember |  | 0 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember
Credit Suisse International [Member] | Moody's, A1 Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A1 | [1] |
Credit Suisse International [Member] | Standard & Poor's, A Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A | [1] |
Societe Generale [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative Instruments, Notional Amount | 25,400 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember |  | 0 invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember
Derivative Instruments, Fair Value | 756 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember |  | $ 0 us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember
Societe Generale [Member] | Moody's, A2 Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A2 | [1] |
Societe Generale [Member] | Standard & Poor's, A Rating [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Debt Instrument, Credit Rating | A | [1] |
[1] | As assigned by Standard & Poor’s Corporation (“S&P”) and Moody’s Investors Service, Inc. (“Moody’s”).

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- 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
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- Definition Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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