NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Loans Receivable
Impaired Financing Receivable, Recorded Investment	$ 9,474	$ 17,819	$ 9,474	$ 17,819	$ 10,267
Impaired Financing Receivable, Unpaid Principal Balance	10,856	19,240	10,856	19,240	11,435
Impaired Financing Receivable, Related Allowance	711	1,417	711	1,417	929
Impaired Financing Receivable, Average Recorded Investment	10,211	14,877	10,370	14,525	12,487
Impaired Financing Receivable Interest Income Recognized	113	279	261	455	839
Commercial Loan
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Commercial Real Estate
Impaired Financing Receivable, Recorded Investment	3,674	7,809	3,674	7,809	4,020
Impaired Financing Receivable, Unpaid Principal Balance	3,711	7,834	3,711	7,834	4,049
Impaired Financing Receivable, Related Allowance	486	555	486	555	517
Impaired Financing Receivable, Average Recorded Investment	3,885	6,349	4,004	5,612	4,940
Impaired Financing Receivable Interest Income Recognized	37	86	67	136	264
Industrial revenue bonds
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Automobile Loan
Impaired Financing Receivable, Recorded Investment	753	1,040	753	1,040	1,117
Impaired Financing Receivable, Unpaid Principal Balance	959	1,230	959	1,230	1,334
Impaired Financing Receivable, Related Allowance	122	133	122	133	181
Impaired Financing Receivable, Average Recorded Investment	868	1,088	973	1,240	1,128
Impaired Financing Receivable Interest Income Recognized	14	18	40	43	125
Home Equity Line of Credit
Impaired Financing Receivable, Recorded Investment	527	364	527	364	528
Impaired Financing Receivable, Unpaid Principal Balance	557	380	557	380	548
Impaired Financing Receivable, Related Allowance	4	3	4	3	4
Impaired Financing Receivable, Average Recorded Investment	500	290	538	254	362
Impaired Financing Receivable Interest Income Recognized	7	10	19	17	37
Land Improvements
Impaired Financing Receivable, Recorded Investment	0	3,556	0	3,556	0
Impaired Financing Receivable, Unpaid Principal Balance	0	3,588	0	3,588	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	1,189	0	601	328
Impaired Financing Receivable Interest Income Recognized	0	99	0	99	101
One- to four-family residential construction
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Subdivision construction
Impaired Financing Receivable, Recorded Investment	24	261	24	261	251
Impaired Financing Receivable, Unpaid Principal Balance	24	261	24	261	251
Impaired Financing Receivable, Related Allowance	0	100	0	100	96
Impaired Financing Receivable, Average Recorded Investment	170	280	209	293	277
Impaired Financing Receivable Interest Income Recognized	1	3	3	5	9
Owner occupied one- to four-family residential
Impaired Financing Receivable, Recorded Investment	2,751	2,157	2,751	2,157	2,300
Impaired Financing Receivable, Unpaid Principal Balance	3,034	2,434	3,034	2,434	2,423
Impaired Financing Receivable, Related Allowance	78	114	78	114	82
Impaired Financing Receivable, Average Recorded Investment	2,882	2,839	2,702	3,097	2,598
Impaired Financing Receivable Interest Income Recognized	34	20	80	57	131
Non-owner occupied one- to four-family residential
Impaired Financing Receivable, Recorded Investment	279	764	279	764	409
Impaired Financing Receivable, Unpaid Principal Balance	471	944	471	944	574
Impaired Financing Receivable, Related Allowance	0	22	0	22	20
Impaired Financing Receivable, Average Recorded Investment	418	815	425	1,296	954
Impaired Financing Receivable Interest Income Recognized	5	6	11	18	43
Other residential
Impaired Financing Receivable, Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0	0	0
Commercial Borrower
Impaired Financing Receivable, Recorded Investment	1,220	1,451	1,220	1,451	1,286
Impaired Financing Receivable, Unpaid Principal Balance	1,726	1,918	1,726	1,918	1,771
Impaired Financing Receivable, Related Allowance	9	470	9	470	13
Impaired Financing Receivable, Average Recorded Investment	1,223	1,626	1,243	1,700	1,517
Impaired Financing Receivable Interest Income Recognized	9	26	25	58	81
Consumer Borrower
Impaired Financing Receivable, Recorded Investment	246	417	246	417	356
Impaired Financing Receivable, Unpaid Principal Balance	374	651	374	651	485
Impaired Financing Receivable, Related Allowance	12	20	12	20	16
Impaired Financing Receivable, Average Recorded Investment	265	401	276	432	383
Impaired Financing Receivable Interest Income Recognized	$ 6	$ 11	$ 16	$ 22	$ 48