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Note 13: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 (0.80%) (1.20%) (0.90%) (1.50%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (3.60%) (4.30%) (4.00%) (5.10%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.20% 1.80% 1.20% 1.50%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.10%) (0.50%) (0.30%) (1.00%)
Effective Income Tax Rate Reconciliation, Percent 17.70% 30.80% 17.00% 28.90%