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Investments (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Investments (Textual) [Abstract]
Fair value of issued securities	$ 6,676,339	$ 6,009,573
Investments (Additional Textual) [Abstract]
Cash received in an amount equal to fair value of securities transferred	95.00%
Fair value of securities transferred	143,216	24,791
Obligation for securities sold under agreement to repurchase, including accrued interest	139,959	25,864
Federal Home Loan Bank Funding Requirements	250,000
Investment Grade Rate	95.00%
Federal Home Loan Bank [Member] | Fixed Maturities [Member]
Investments (Additional Textual) [Abstract]
Securities Deposited Fair Value	18,420	17,967
Securities Deposited As Collateral	275,888	274,437
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities	342,198	336,193
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities	441,363	427,172
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities	$ 136,208	$ 126,245

X

- Definition

Represents the funding requirements of Federal Home Loan Bank (FHLBank).

+ References

No definition available.

+ Details

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X

- Definition

Investment grade rating during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	hmn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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- Details

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X

- Definition

Repurchase agreement minimum percentage of fair value of securities received.

+ References

No definition available.

+ Details

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X

- Definition

Repurchase agreement securities transferred fair value.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Represents the fair value of securities deposited as collateral.

+ References

No definition available.

+ Details

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X

- Definition

Securities deposited fair value.

+ References

No definition available.

+ Details

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X

- Definition

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement, including accrued interest.

+ References

No definition available.

+ Details

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X

- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 320

-Section 50

-Paragraph 2

-Subparagraph (b)-(g)

-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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