Earnings Per Share: Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Details
Net income	$ 3,525	$ 3,139	$ 4,308	$ 4,092	$ 6,664	$ 8,400
Weighted average shares, basic	3,721		3,731		3,721	3,728
Dilutive effect of stock options	14		23		16	23
Diluted shares	3,735		3,754		3,737	3,751
Earnings per share, basic	$ 0.95		$ 1.15		$ 1.79	$ 2.25
Earnings per share, diluted	$ 0.94		$ 1.15		$ 1.78	$ 2.24