Earnings Per Share: Schedule of Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net income	$ 2,163	$ 2,792	$ 3,102	$ 6,842	$ 2,406	$ 1,861	$ 1,868	$ 2,344	$ 3,021	$ 2,606	$ 1,440	$ 1,825	$ 14,899	$ 8,479	$ 8,892
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic													(28)	(4)	(21)
Earnings allocated to common shareholders													$ 14,871	$ 8,475	$ 8,871
Basic weighted-average common shares outstanding													10,306,835	10,289,049	11,868,278
Dilutive effect of stock options													108,503	137,950	143,605
Dilutive effect of restricted stock grants													8,849	10,450	16,545
Diluted weighted-average common shares outstanding													10,424,187	10,437,449	12,028,428
Basic earnings (loss) per share (usd per share)	$ 0.21	$ 0.27	$ 0.30	$ 0.67	$ 0.24	$ 0.18	$ 0.18	$ 0.23	$ 0.29	$ 0.22	$ 0.12	$ 0.14	$ 1.44	$ 0.82	$ 0.75
Diluted earnings (loss) per share (usd per share)	$ 0.21	$ 0.27	$ 0.30	$ 0.66	$ 0.23	$ 0.18	$ 0.18	$ 0.22	$ 0.29	$ 0.22	$ 0.11	$ 0.14	$ 1.43	$ 0.81	$ 0.74