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Note 14: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
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%) (0.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (3.50%) (4.50%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent (1.70%) 1.40%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent 0.30% 1.10%
Effective Income Tax Rate Reconciliation, Percent 15.60% 18.50%