Note 14: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Details
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(0.50%)	(1.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(4.50%)	(4.50%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.40%	1.20%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.10%	(0.20%)
Effective Income Tax Rate Reconciliation, Percent	18.50%	16.40%