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Shareholders' Equity and Common Stock Equivalents (Details 1) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of changes in outstanding options |  |  |
Weighted Average Option Price per Share, Beginning Balance | $ 17.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |  |
Weighted Average Option Price per Share, Options Granted | $ 28.88 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |  |
Weighted Average Option Price per Share, Options Vested | $ 17.78 hmn_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsVestedInPeriodWeightedAverageExercisePrice |  |
Weighted Average Option Price per Share, Options Exercised | $ 16.50 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |  |
Weighted Average Option Price per Share, Options Forfeited | $ 18.53 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice |  |
Weighted Average Option Price per Share, Options Expired | $ 0 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExpirationsInPeriodWeightedAverageExercisePrice |  |
Weighted Average Option Price per Share, Ending Balance | $ 21.22 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 17.49 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
Range of Option Prices per Share, Expired | $ 0 hmn_ShareBasedCompensationSharesExpiredUnderStockOptionPlansExercisePriceRange |  |
Options Outstanding, Beginning Balance | 956,814 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,882,939 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
Options Outstanding, Granted | 175,632 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 245,424 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 296,188 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Options Outstanding, Vested | 0 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares |  |
Options Outstanding, Exercised | (435,665)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (1,158,537)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | (389,089)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options Outstanding, Forfeited | (62,344)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod |  |
Options Outstanding, Expired | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExpirationsInPeriod |  |
Options Outstanding, Ending Balance | 634,437 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 956,814 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,882,939 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options Vested and Exercisable, Beginning Balance | 314,445 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber |  |
Options Vested and Exercisable, Granted | 0 hmn_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExercisableGrantedInPeriod |  |
Options Vested and Exercisable, Vested | 392,142 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableVestedInPeriod |  |
Options Vested and Exercisable, Exercisable | (435,665)hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableExercisedInPeriod |  |
Options Vested and Exercisable, Forfeited | (62,344)hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableForfeitedInPeriod |  |
Options Vested and Exercisable, Expired | 0 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableExpiredInPeriod |  |
Options Vested and Exercisable, Ending Balance | 208,578 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber | 314,445 hmn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExercisableOutstandingNumber |
Maximum [Member] |  |  |
Summary of changes in outstanding options |  |  |
Range of Option Prices per Share, Beginning Balance | $ 30.24 hmn_ShareBasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Range of Option Prices per Share, Granted | $ 28.91 hmn_ShareBasedCompensationSharesGrantedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Range of Option Prices per Share, Vested | $ 30.24 hmn_ShareBasedCompensationSharesVestedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Range of Option Prices per Share, Exercised | $ 22.69 hmn_ShareBasedCompensationSharesExercisedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Range of Option Prices per Share, Forfeited | $ 20.60 hmn_ShareBasedCompensationSharesForfeitedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Range of Option Prices per Share, Ending Balance | $ 30.24 hmn_ShareBasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Minimum [Member] |  |  |
Summary of changes in outstanding options |  |  |
Range of Option Prices per Share, Beginning Balance | $ 6.91 hmn_ShareBasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Range of Option Prices per Share, Granted | $ 28.88 hmn_ShareBasedCompensationSharesGrantedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Range of Option Prices per Share, Vested | $ 13.83 hmn_ShareBasedCompensationSharesVestedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Range of Option Prices per Share, Forfeited | $ 13.83 hmn_ShareBasedCompensationSharesForfeitedUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Range of Option Prices per Share, Ending Balance | $ 6.91 hmn_ShareBasedCompensationSharesOutstandingUnderStockOptionPlansExercisePriceRange / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Options Outstanding, Exercised | 6.91 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_RangeAxis = us-gaap_MinimumMember |  |

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