Note 14: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Details
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent	(0.60%)	(0.50%)	(0.50%)	(0.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(3.80%)	(3.90%)	(3.90%)	(4.20%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	5.00%	1.00%	1.60%	1.20%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(0.10%)	(0.10%)	0.60%	0.10%
Effective Income Tax Rate Reconciliation, Percent	21.50%	17.50%	18.80%	17.60%