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