Note 10: Short-term Borrowings: Short Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Details
Short-term Debt, Weighted Average Interest Rate, at Point in Time	0.30%	0.50%
Short-term Debt, Average Outstanding Amount	$ 186,400	$ 327,700
Short-term Debt, Maximum Amount Outstanding During Period	$ 297,400	$ 523,100