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Note 13: Income Taxes: Schedule of Components of Income Tax Expense (Benefit) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Details        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00% 35.00%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent (2.10%) (2.50%) (2.10%) (2.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent (7.60%) (8.10%) (7.50%) (8.10%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent 1.10% 1.00% 1.10% 1.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent (1.40%) (0.40%) (0.20%) (0.30%)
Effective Income Tax Rate Reconciliation, Percent 25.00% 25.00% 26.30% 25.30%