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Derivative Instruments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Notional Amount	66,600invest_DerivativeNotionalAmount		$ 0invest_DerivativeNotionalAmount
Derivative Instruments, Fair Value	2,458us-gaap_DebtInstrumentFairValue		0us-gaap_DebtInstrumentFairValue
Bank of America, N.A. [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Notional Amount	8,700invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember		0invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember
Derivative Instruments, Fair Value	439us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_BankOfAmericaNMember		0us-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	5,000invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember		0invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember
Derivative Instruments, Fair Value	70us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_BarclaysBankPlcMember		0us-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	27,500invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember		0invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember
Derivative Instruments, Fair Value	1,193us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_CreditSuisseInternationalMember		0us-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	25,400invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember		0invest_DerivativeNotionalAmount / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember
Derivative Instruments, Fair Value	756us-gaap_DebtInstrumentFairValue / us-gaap_CounterpartyNameAxis = hmn_SocieteGeneraleMember		$ 0us-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”).

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

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X

- 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

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X

- 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

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