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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Plan
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of stock option plans 2emci_NumberOfStockOptionPlans  
Recognized compensation expense $ 73us-gaap_AllocatedShareBasedCompensationExpense $ 51us-gaap_AllocatedShareBasedCompensationExpense
Recognized compensation expense, net of tax $ 48us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 33us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Employers Mutual Casualty Company Incentive Stock Option 2003 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Registered shares (in shares) 1,500,000emci_RegisteredShares
/ us-gaap_PlanNameAxis
= emci_EmployersMutualCasualtyCompanyIncentiveStockOption2003PlanMember
 
Time limit for granting awards 10 years 10 years
Employers Mutual Casualty Company Stock Incentive 2007 Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Registered shares (in shares) 2,000,000emci_RegisteredShares
/ us-gaap_PlanNameAxis
= emci_EmployersMutualCasualtyCompanyStockIncentive2007PlanMember
 
Time limit for granting awards 10 years 10 years
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 4 years 4 years
Number of restricted stock shares granted during period (in shares) 68,764us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Number of restricted stock shares vested during period (in shares) 27,357us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
 
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period 5 years 5 years
Options exercised during period (in shares) 92,017us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Weighted average exercise price of options exercised during period (in dollars per share) $ 21.39us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember