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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued policyholder dividends.

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Amount attributable to taxable temporary differences from postretirement benefits.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to proration of tax-exempt interest and dividends received under enacted tax laws.

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From affiliates, tax effects of the net changes to accumulated comprehensive income during the period related to pension plans that is attributable to the parent entity.

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From affiliates, tax effects of the net changes to accumulated comprehensive income during the period related to postretirement benefit plans that is attributable to the parent entity.

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This item represents the tax effects occurring during the period which are related to the net unrealized gain (loss) resulting from changes in the fair [carrying] value during the period of available-for-sale securities. Such tax affects would have been charged or credited directly to other comprehensive income or to related components of shareholders' equity.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from loss reserves other than estimated credit losses.

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INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of Deferred Tax Assets [Abstract]
Loss reserve discounting	$ 15,681				$ 17,690				$ 15,681	$ 17,690
Unearned premium reserve limitation	15,648				14,764				15,648	14,764
Other policyholders' funds payable	3,553				2,972				3,553	2,972
Other, net	1,145us-gaap_DeferredTaxAssetsOther				1,761us-gaap_DeferredTaxAssetsOther				1,145us-gaap_DeferredTaxAssetsOther	1,761us-gaap_DeferredTaxAssetsOther
Total deferred income tax asset	36,027us-gaap_DeferredTaxAssetsGross				37,187us-gaap_DeferredTaxAssetsGross				36,027us-gaap_DeferredTaxAssetsGross	37,187us-gaap_DeferredTaxAssetsGross
Net unrealized holding gains on investment securities	(42,195)				(26,049)				(42,195)	(26,049)
Deferred policy acquisition costs	(13,770)				(13,227)				(13,770)	(13,227)
Retirement benefits	(5,712)				(8,234)				(5,712)	(8,234)
Other, net	(3,004)us-gaap_DeferredTaxLiabilitiesOther				(2,499)us-gaap_DeferredTaxLiabilitiesOther				(3,004)us-gaap_DeferredTaxLiabilitiesOther	(2,499)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liability	(64,681)us-gaap_DeferredIncomeTaxLiabilities				(50,009)us-gaap_DeferredIncomeTaxLiabilities				(64,681)us-gaap_DeferredIncomeTaxLiabilities	(50,009)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income tax liability	(28,654)us-gaap_DeferredTaxAssetsLiabilitiesNet				(12,822)us-gaap_DeferredTaxAssetsLiabilitiesNet				(28,654)us-gaap_DeferredTaxAssetsLiabilitiesNet	(12,822)us-gaap_DeferredTaxAssetsLiabilitiesNet
Income tax expense (benefit) reconciliation [Abstract]
United States federal corporate tax rate (in hundredths)									35.00%	35.00%	35.00%
Computed expected income tax expense									14,318	21,298	18,072
Increases (decreases) in tax resulting from:
Tax-exempt interest income									(3,285)	(3,828)	(4,433)
Dividends received deduction									(828)	(876)	(723)
Proration of tax-exempt interest and dividends received deduction									617emci_IncomeTaxReconciliationProration	706emci_IncomeTaxReconciliationProration	773emci_IncomeTaxReconciliationProration
Other, net									93	34	(22)
Total income tax expense	7,711us-gaap_IncomeTaxExpenseBenefit	(346)us-gaap_IncomeTaxExpenseBenefit	(744)us-gaap_IncomeTaxExpenseBenefit	4,294us-gaap_IncomeTaxExpenseBenefit	6,996us-gaap_IncomeTaxExpenseBenefit	2,365us-gaap_IncomeTaxExpenseBenefit	1,737us-gaap_IncomeTaxExpenseBenefit	6,236us-gaap_IncomeTaxExpenseBenefit	10,915us-gaap_IncomeTaxExpenseBenefit	17,334us-gaap_IncomeTaxExpenseBenefit	13,667us-gaap_IncomeTaxExpenseBenefit
Comprehensive Income Loss Tax [Abstract]
Operations	7,711us-gaap_IncomeTaxExpenseBenefit	(346)us-gaap_IncomeTaxExpenseBenefit	(744)us-gaap_IncomeTaxExpenseBenefit	4,294us-gaap_IncomeTaxExpenseBenefit	6,996us-gaap_IncomeTaxExpenseBenefit	2,365us-gaap_IncomeTaxExpenseBenefit	1,737us-gaap_IncomeTaxExpenseBenefit	6,236us-gaap_IncomeTaxExpenseBenefit	10,915us-gaap_IncomeTaxExpenseBenefit	17,334us-gaap_IncomeTaxExpenseBenefit	13,667us-gaap_IncomeTaxExpenseBenefit
Change in unrealized holding gains on investment securities									16,146	(11,539)	10,043
Change in funded status of retirement benefit plans:
Pension plans									(2,619)	5,498	598
Postretirement benefit plans									(1,330)	12,103	350
Comprehensive income tax expense									23,112	23,396	24,658
Provision for uncertain tax positions	0us-gaap_UnrecognizedTaxBenefits				0us-gaap_UnrecognizedTaxBenefits				0us-gaap_UnrecognizedTaxBenefits	0us-gaap_UnrecognizedTaxBenefits
Interest income related to US federal income taxes									1emci_IncomeTaxExaminationInterestIncome	0emci_IncomeTaxExaminationInterestIncome	3emci_IncomeTaxExaminationInterestIncome
Income Tax Examination, Penalties and Interest Expense									$ 0	$ 0	$ 0