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Shareholders' Equity and Common Stock Equivalents (Details 2) (USD $) | 12 Months Ended |  |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options | 634,437 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 956,814 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,882,939 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Total Outstanding Options, Weighted Average Option Price per Share | $ 21.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 17.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
Vested and Exercisable Options | 208,578 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber | 314,445 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber |
Vested and Exercisable Options, Weighted Average Option Price per Share |  | $ 15.78 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice | $ 14.28 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice
Exercise Price Range Range One [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options | 148,244 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeOneMember |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 16.12 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeOneMember |  |
Total Outstanding Options, Weighted Average Remaining Term | 2 years 10 months 24 days |  |
Vested and Exercisable Options | 109,438 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeOneMember |  |
Vested and Exercisable Options, Weighted Average Option Price per Share | $ 15.83 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeOneMember |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 2 years 9 months 18 days |  |
Exercise Price Range Range One [Member] | Maximum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 17.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeOneMember |  |
Exercise Price Range Range One [Member] | Minimum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 6.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeOneMember |  |
Exercise Price Range Range Two [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options | 307,373 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeTwoMember |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 19.20 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeTwoMember |  |
Total Outstanding Options, Weighted Average Remaining Term | 4 years 8 months 12 days |  |
Vested and Exercisable Options | 98,343 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeTwoMember |  |
Vested and Exercisable Options, Weighted Average Option Price per Share | $ 18.63 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeTwoMember |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 4 years 6 months |  |
Exercise Price Range Range Two [Member] | Maximum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 22.69 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeTwoMember |  |
Exercise Price Range Range Two [Member] | Minimum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 17.32 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeTwoMember |  |
Exercise Price Range Range Three [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options | 178,820 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeThreeMember |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 28.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeThreeMember |  |
Total Outstanding Options, Weighted Average Remaining Term | 9 years 2 months 12 days |  |
Vested and Exercisable Options | 797 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeThreeMember |  |
Vested and Exercisable Options, Weighted Average Option Price per Share | $ 30.24 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeThreeMember |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 6 years |  |
Exercise Price Range Range Three [Member] | Maximum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 30.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeThreeMember |  |
Exercise Price Range Range Three [Member] | Minimum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 28.88 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeThreeMember |  |
Exercise Price Range Range Four [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Options | 634,437 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeFourMember |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 21.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeFourMember |  |
Total Outstanding Options, Weighted Average Remaining Term | 5 years 6 months |  |
Vested and Exercisable Options | 208,578 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeFourMember |  |
Vested and Exercisable Options, Weighted Average Option Price per Share | $ 17.20 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableWeightedAverageExercisePrice / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeFourMember |  |
Vested and Exercisable Options, Weighted Average Remaining Term | 3 years 7 months 6 days |  |
Exercise Price Range Range Four [Member] | Maximum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 30.24 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeFourMember |  |
Exercise Price Range Range Four [Member] | Minimum [Member] |  |  |
Summary of options outstanding segregated by ranges of exercise prices |  |  |
Total Outstanding Options, Weighted Average Option Price per Share | $ 6.91 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis = hmn_ExercisePriceRangeRangeFourMember |  |

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- Definition Share based compensation arrangement by share based payment award options vested and exercisable weighted average remaining contractual term. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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