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Note 14: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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%) (0.80%) (0.50%) (0.90%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (4.20%) (3.60%) (4.40%) (4.00%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.20% 1.20% 1.30% 1.20%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.70%) (0.10%) 0.30% (0.30%)
Effective Income Tax Rate Reconciliation, Percent 16.80% 17.70% 17.70% 17.00%