Summary of Unaudited Quarterly Operating Results: Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	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, 2021	Dec. 31, 2020	Dec. 31, 2019
Summary of Unaudited Quarterly Operating Results
Interest income	$ 47,948	$ 49,640	$ 50,452	$ 50,633	$ 52,619	$ 53,599	$ 54,011	$ 57,474	$ 58,726	$ 60,187	$ 58,723	$ 57,358
Interest expense	3,723	4,717	5,768	6,544	8,042	9,431	10,556	12,536	13,784	14,263	13,802	12,753
Provision (credit) for credit losses on loans	(3,000)	(3,000)	(1,000)	300	1,500	4,500	6,000	3,871	650	1,950	1,600	1,950
Provision for unfunded commitments	1,277	643	(307)	(674)									$ 939	$ 0	$ 0
Net realized gains (losses) on available-for-sale securities							78		(72)			10	$ 0	$ 78	$ (62)
Noninterest income	9,198	9,798	9,585	9,736	9,956	9,466	8,261	7,367	7,695	8,655	7,157	7,450
Noninterest expense	35,784	31,339	30,191	30,321	31,073	31,988	29,349	30,815	29,535	28,725	28,383	28,495
Provision for income taxes	4,081	5,375	5,271	5,010	4,172	3,692	3,164	2,751	4,559	4,172	3,720	3,998
Net income available to common shareholders	$ 15,281	$ 20,364	$ 20,114	$ 18,868	$ 17,788	$ 13,454	$ 13,203	$ 14,868	$ 17,893	$ 19,732	$ 18,375	$ 17,612
Earnings per common share - diluted	$ 1.14	$ 1.49	$ 1.46	$ 1.36	$ 1.28	$ 0.96	$ 0.93	$ 1.04	$ 1.24	$ 1.38	$ 1.28	$ 1.23