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Note 13: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Details    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent (1.10%) (1.90%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (4.50%) (6.40%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.20% 1.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (0.20%) (1.70%)
Effective Income Tax Rate Reconciliation, Percent 16.40% 26.10%