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INCOME TAXES (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income tax expense (benefit) reconciliation [Abstract]      
United States federal corporate tax rate (in hundredths) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate  
Computed expected income tax expense $ 10,478us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 5,211us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
Increases (decreases) in tax resulting from:      
Tax-exempt interest income (698)us-gaap_IncomeTaxReconciliationTaxExemptIncome (944)us-gaap_IncomeTaxReconciliationTaxExemptIncome  
Dividends received deduction (258)us-gaap_IncomeTaxReconciliationDeductionsDividends (220)us-gaap_IncomeTaxReconciliationDeductionsDividends  
Proration of tax-exempt interest and dividends received deduction 143emci_IncomeTaxReconciliationProration 175emci_IncomeTaxReconciliationProration  
Other, net (58)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 72us-gaap_IncomeTaxReconciliationOtherReconcilingItems  
Total income tax expense 9,607us-gaap_IncomeTaxExpenseBenefit 4,294us-gaap_IncomeTaxExpenseBenefit  
Provision for uncertain tax positions $ 0us-gaap_UnrecognizedTaxBenefits   $ 0us-gaap_UnrecognizedTaxBenefits