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Federal Income Taxes	9 Months Ended
	Sep. 30, 2017
Federal Income Taxes [Abstract]
Federal Income Taxes	 6.  Federal Income Taxes  The effective tax rate is the ratio of tax expense over pre-tax income (loss).  The effective tax rate was 18% and 17% for the three and nine months ended September 30, 2017, respectively. The effective tax rate was 24% and 21% for the three and nine months ended September 30, 2016, respectively.  The effective tax rate on pre-tax income was lower than the prevailing corporate federal income tax rate.  Differences in the effective rates and the U.S. statutory rate of 35% were the result of certain tax preferred investment income, separate account dividends-received deductions, foreign tax credits and other tax preference items. 

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- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI http://asc.fasb.org/topic&trid=2144680

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