Note 13: Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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	(1.80%)	(3.10%)	(2.40%)	(3.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(8.00%)	(9.20%)	(8.10%)	(9.60%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.30%	1.60%	1.10%	1.40%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	(0.40%)	0.70%	(0.10%)	0.30%
Effective Income Tax Rate Reconciliation, Percent	26.10%	25.00%	25.50%	23.70%