Earnings Per Share Schedule of Earnings Per Share, Basic (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 3,794	$ 4,147	$ 2,668	$ 2,196	$ 2,759	$ 2,738	$ 2,530	$ 2,621	$ 12,805	$ 10,648
Weighted average common shares outstanding for basic EPS (in shares)									4,474,649	4,468,336
Dilutive effect of stock-based awards (in shares)									18,508	12,856
Weighted-average common and potential common shares for diluted EPS (in shares)									4,493,157	4,481,192
Basic earnings per share (in usd per share)	$ 0.85	$ 0.92	$ 0.60	$ 0.49	$ 0.61	$ 0.62	$ 0.56	$ 0.59	$ 2.86	$ 2.38
Diluted earnings per common share (in usd per share)									$ 2.85	$ 2.38