NOTE 6: LOANS AND ALLOWANCE FOR LOAN LOSSES: Impaired Financing Receivables (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Automobile Loan
Impaired Financing Receivable, Recorded Investment	$ 1,261	$ 2,463	$ 1,874
Impaired Financing Receivable, Unpaid Principal Balance	1,518	2,655	2,114
Impaired Financing Receivable, Related Allowance	226	444	336
Impaired Financing Receivable, Average Recorded Investment	1,391	2,461	2,069
Impaired Financing Receivable Interest Income Recognized	24	41	167
One-to-Four-Family Residential Construction
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0
Subdivision Construction
Impaired Financing Receivable, Recorded Investment	283	343	318
Impaired Financing Receivable, Unpaid Principal Balance	314	363	318
Impaired Financing Receivable, Related Allowance	103	112	105
Impaired Financing Receivable, Average Recorded Investment	305	370	321
Impaired Financing Receivable Interest Income Recognized	2	6	17
Land Development
Impaired Financing Receivable, Recorded Investment	14	15	14
Impaired Financing Receivable, Unpaid Principal Balance	18	18	18
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	14	15	14
Impaired Financing Receivable Interest Income Recognized	0	0	1
Commercial Construction
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0
Owner Occupied One-to-Four-Family Residential
Impaired Financing Receivable, Recorded Investment	3,115	3,293	3,576
Impaired Financing Receivable, Unpaid Principal Balance	3,421	3,608	3,926
Impaired Financing Receivable, Related Allowance	255	295	285
Impaired Financing Receivable, Average Recorded Investment	3,355	3,293	3,406
Impaired Financing Receivable Interest Income Recognized	37	45	197
Non-Owner Occupied One To Four Family Residential
Impaired Financing Receivable, Recorded Investment	919	3,389	2,222
Impaired Financing Receivable, Unpaid Principal Balance	1,118	3,680	2,519
Impaired Financing Receivable, Related Allowance	24	368	304
Impaired Financing Receivable, Average Recorded Investment	1,776	3,438	2,870
Impaired Financing Receivable Interest Income Recognized	13	54	158
Commercial Real Estate
Impaired Financing Receivable, Recorded Investment	5,927	6,987	3,501
Impaired Financing Receivable, Unpaid Principal Balance	6,083	7,137	3,665
Impaired Financing Receivable, Related Allowance	946	224	613
Impaired Financing Receivable, Average Recorded Investment	4,876	7,266	6,216
Impaired Financing Receivable Interest Income Recognized	50	78	337
Other Residential
Impaired Financing Receivable, Recorded Investment	0	1,025	0
Impaired Financing Receivable, Unpaid Principal Balance	0	1,025	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	2,411	1,026
Impaired Financing Receivable Interest Income Recognized	0	10	20
Commercial Business
Impaired Financing Receivable, Recorded Investment	1,713	4,187	1,844
Impaired Financing Receivable, Unpaid Principal Balance	2,125	4,840	2,207
Impaired Financing Receivable, Related Allowance	246	2,176	309
Impaired Financing Receivable, Average Recorded Investment	1,775	3,691	2,932
Impaired Financing Receivable Interest Income Recognized	32	31	362
Industrial Revenue Bonds
Impaired Financing Receivable, Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0	0
Impaired Financing Receivable, Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0
Impaired Financing Receivable Interest Income Recognized	0	0	0
Consumer Loan
Impaired Financing Receivable, Recorded Investment	415	904	479
Impaired Financing Receivable, Unpaid Principal Balance	639	1,011	684
Impaired Financing Receivable, Related Allowance	62	136	72
Impaired Financing Receivable, Average Recorded Investment	464	868	738
Impaired Financing Receivable Interest Income Recognized	11	19	59
Home Equity Line of Credit
Impaired Financing Receivable, Recorded Investment	261	560	111
Impaired Financing Receivable, Unpaid Principal Balance	276	601	128
Impaired Financing Receivable, Related Allowance	39	86	17
Impaired Financing Receivable, Average Recorded Investment	218	567	412
Impaired Financing Receivable Interest Income Recognized	7	19	28
Loans Receivable
Impaired Financing Receivable, Recorded Investment	13,908	23,166	13,939
Impaired Financing Receivable, Unpaid Principal Balance	15,512	24,938	15,579
Impaired Financing Receivable, Related Allowance	1,901	3,841	2,041
Impaired Financing Receivable, Average Recorded Investment	14,174	24,380	20,004
Impaired Financing Receivable Interest Income Recognized	$ 176	$ 303	$ 1,346