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Note 13: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Details        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00% 21.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent (0.50%) (1.60%) (0.70%) (1.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (2.20%) (7.80%) (3.20%) (5.90%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.20% 1.10% 1.20% 1.30%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.00% 0.20% (0.10%) (0.60%)
Effective Income Tax Rate Reconciliation, Percent 19.50% 26.90% 18.20% 28.30%