Federal Income Taxes: Components of The Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Current	$ 717	$ 254	$ 199
Deferred	4,170	5,602	(13,742)
Total income tax expense (benefit)	$ 4,887	$ 5,856	$ (13,543)