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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Federal income tax rate applied to pre-tax income/loss 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Dividends received deduction and tax-exempt interest (1.20%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends (1.70%)us-gaap_EffectiveIncomeTaxRateReconciliationDeductionsDividends
Company owned life insurance (12.00%)nsec_EffectiveIncomeTaxRateReconciliationColi 0.30%nsec_EffectiveIncomeTaxRateReconciliationColi
Small life deduction (3.10%)nsec_EfectiveInomeTaxRateReconciliationSmallLifeDeduction (4.00%)nsec_EfectiveInomeTaxRateReconciliationSmallLifeDeduction
Life reserve tax adjustment 0.00%nsec_EffectiveIncomeTaxRateReconciliationLifeTaxReserveAdjustment (6.70%)nsec_EffectiveIncomeTaxRateReconciliationLifeTaxReserveAdjustment
Other, net 1.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.80%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective federal income tax rate 18.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 22.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations