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Summary of Significant Accounting Policies (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Summary of Significant Accounting Policies (Textual) [Abstract]      
Earnings Per Share, Potentially Dilutive Securities $28.88 to $30.24    
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Acquisition costs amortization in years for individual life contracts term one 10 years    
Acquisition costs amortization in years for individual life contracts term two 15 years    
Acquisition costs amortization in years for individual life contracts term three 20 years    
Acquisition costs amortization in years for individual life contracts term four 30 years    
Property and Casualty policy, acquisition cost amortized term one 6 months    
Property and Casualty policy, acquisition cost amortized term two 12 months    
Financial market performance assumption 10.00%hmn_PercentageOfReversionToMeanApproachUtilizedToAmortizePolicyAcquisitionCosts    
Compensation cost for share-based compensation plans based on the fair value $ 1,270us-gaap_AllocatedShareBasedCompensationExpense $ 1,419us-gaap_AllocatedShareBasedCompensationExpense $ 2,476us-gaap_AllocatedShareBasedCompensationExpense
Number of options not included in diluted earnings per share computation 178,820us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount    
Weighted average fair value of nonvested options outstanding $ 7.95hmn_WeightedAverageFairValueOfNonvestedOptionsOutstanding    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 10,943us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 22,245us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax 27,298us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesBeforeTax
Federal Home Loan Bank Advances Branch Of FHLB Bank Borrowings Description Any borrowing from the FHLB requires the purchase of FHLB activity-based common stock in an amount equal to 5.0% of the borrowing, or a lower percentage such as 2.0% based on the Reduced Capitalization Advance Program.    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate 0.26%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate    
Financial market performance corridor assumption with basis point 200hmn_BasisPointCorridorAroundMeanAssumptionsUtilizedToAmortizePolicyAcquisitionCosts    
Other Tax Expense (Benefit) 3,830us-gaap_OtherTaxExpenseBenefit 7,786us-gaap_OtherTaxExpenseBenefit  
Maturing On December 28, 2015 [Member]      
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 125,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ hmn_MaturityDateAxis
= hmn_MaturingOnDecemberTwoEightTwoZeroOneFiveMember
   
Maturing On December 15, 2023 [Member]      
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 125,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ hmn_MaturityDateAxis
= hmn_MaturingOnDecemberOneFiveTwoZeroTwoThreeMember
   
Maturing On September 13, 2019 [Member]      
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 250,000us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankAmountOfAdvancesByBranch
/ hmn_MaturityDateAxis
= hmn_MaturingOnSeptember132019Member
   
Nonvested [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Nonvested options outstanding 2,462us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= hmn_NonvestedMember
   
Interest Sensitive Life Contracts [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Capitalized acquisition costs amortization period for interest-sensitive life contracts 20 years    
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Deferred Policy Acquisition Cost Ending Impact Of Unrealized Investment Gains Losses $ 67,932hmn_DeferredPolicyAcquisitionCostEndingImpactOfUnrealizedInvestmentGainsLosses
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmn_InterestSensitiveLifeContractsMember
$ 24,997hmn_DeferredPolicyAcquisitionCostEndingImpactOfUnrealizedInvestmentGainsLosses
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= hmn_InterestSensitiveLifeContractsMember
 
Investment Contracts [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Acquisition costs, amortization period 20 years    
Maximum [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Reserve investment yield assumptions on certain life insurance policies 8.00%hmn_ReserveInvestmentYieldAssumptionLife
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Guarantee Of Premium Annual Rate Percentage 5.00%hmn_GuaranteeOfPremiumAnnualRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Minimum [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Reserve investment yield assumptions on certain life insurance policies 3.50%hmn_ReserveInvestmentYieldAssumptionLife
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Option expiration date 2015    
Summary of Significant Accounting Policies (Additional Textual) [Abstract]      
Guarantee Of Premium Annual Rate Percentage 3.00%hmn_GuaranteeOfPremiumAnnualRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Leasehold improvements and other property and equipment [Member] | Maximum [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Estimated useful lives of property and equipment 10 years    
Leasehold improvements and other property and equipment [Member] | Minimum [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Estimated useful lives of property and equipment 2 years    
Real Estate Property [Member] | Maximum [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Estimated useful lives of property and equipment 45 years    
Real Estate Property [Member] | Minimum [Member]      
Summary of Significant Accounting Policies (Textual) [Abstract]      
Estimated useful lives of property and equipment 20 years