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INCOME TAXES - RECONCILIATION OF CORPORATE TAX RATE (Details)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Income Tax Disclosure [Abstract]    
U.S. statutory corporate rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Non-taxable income and nondeductible benefits, net (0.80%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther (0.70%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseOther
State taxes 1.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 1.50%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Estimated annual effective tax rate 35.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations