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, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Details
Net income	$ 4,200	$ 4,214	$ 4,103	$ 3,534	$ 8,414	$ 7,638
Weighted average shares, basic	3,628		3,643		3,628	3,649
Dilutive effect of stock options	11		7		10	9
Diluted shares	3,639		3,650		3,638	3,658
Earnings per share, basic	$ 1.16		$ 1.13		$ 2.32	$ 2.09
Earnings per share, diluted	$ 1.15		$ 1.12		$ 2.31	$ 2.09