Note 14: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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	(0.50%)	(0.50%)	(0.50%)	(0.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(4.30%)	(4.20%)	(3.90%)	(4.40%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.50%	1.20%	(0.20%)	1.30%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	1.60%	(0.70%)	1.00%	0.30%
Effective Income Tax Rate Reconciliation, Percent	19.30%	16.80%	17.40%	17.70%