Note 13: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
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	(1.60%)	(2.10%)	(1.50%)	(2.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(7.80%)	(7.60%)	(5.90%)	(7.50%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.10%	1.10%	1.30%	1.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.20%	(1.40%)	(0.60%)	(0.20%)
Effective Income Tax Rate Reconciliation, Percent	26.90%	25.00%	28.30%	26.30%