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Note 14: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
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%) (0.70%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (3.90%) (2.20%) (4.20%) (3.20%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.00% 1.20% 1.20% 1.20%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.10%) 0.00% 0.10% (0.10%)
Effective Income Tax Rate Reconciliation, Percent 17.50% 19.50% 17.60% 18.20%