Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]: Other than Temporary Impairment, Credit Losses Recognized in Earnings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Details
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 0	$ 473	$ 473
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	(473)	0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held	$ 0	$ 0	$ 473