Note 3: Loans and Allowance For Loan Losses: Troubled Debt Restructurings on Financing Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Troubled Debt Restructurings Total Modifications	$ 15,000	$ 21,100	$ 45,000
Commercial Business
Troubled Debt Restructuring Loans Interest Only	0	0	0
Troubled Debt Restructuring Loans Modified Term	16	38	1,095
Troubled Debt Restructuring Loans Modified Combination	274	0	0
Troubled Debt Restructurings Total Modifications	290	38	1,095
Consumer Loan
Troubled Debt Restructuring Loans Interest Only	0	0	0
Troubled Debt Restructuring Loans Modified Term	245	59	97
Troubled Debt Restructuring Loans Modified Combination	0	0	0
Troubled Debt Restructurings Total Modifications	245	59	97
Total Newly Restructured Loans
Troubled Debt Restructuring Loans Interest Only	0	3,435	0
Troubled Debt Restructuring Loans Modified Term	261	97	1,714
Troubled Debt Restructuring Loans Modified Combination	6,033	0	164
Troubled Debt Restructurings Total Modifications	6,294	3,532	1,878
Construction And Land Development
Troubled Debt Restructuring Loans Modified Term		0
Troubled Debt Restructuring Loans Modified Combination		0
Troubled Debt Restructurings Total Modifications		429
Mortgage Loan on Real Estate | Commercial Real Estate
Troubled Debt Restructuring Loans Interest Only	0	2,946	0
Troubled Debt Restructuring Loans Modified Term	0	0	115
Troubled Debt Restructuring Loans Modified Combination	5,759	0	0
Troubled Debt Restructurings Total Modifications	$ 5,759	2,946	115
Mortgage Loan on Real Estate | One To Four Family Residential
Troubled Debt Restructuring Loans Interest Only		60	0
Troubled Debt Restructuring Loans Modified Term		0	407
Troubled Debt Restructuring Loans Modified Combination		0	164
Troubled Debt Restructurings Total Modifications		$ 60	$ 571