Note 13: Income Taxes: Schedule of Effective Income Tax Rate Reconciliation (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 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	(1.20%)	(1.60%)	(1.50%)	(2.10%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(4.30%)	(6.50%)	(5.10%)	(7.50%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.80%	1.10%	1.50%	1.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(0.50%)	0.30%	(1.00%)	0.40%
Effective Income Tax Rate Reconciliation, Percent	30.80%	28.30%	28.90%	26.90%