Note 12: Business Combinations: Business Combinations Policy (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2018
Business Acquisition, Name of Acquired Entity			Gideon Bancshares Company (“Gideon”), and its wholly owned subsidiary, First Commercial Bank (“First Commercial”)
Total noninterest expense	$ 13,190	$ 11,927	$ 37,191	$ 33,201
Noninterest Expense	13,190	$ 11,927	37,191	$ 33,201
Gideon Bancshares Company
Business Combination, Acquisition Related Costs	873
Total noninterest expense	243		798		$ 75
Noninterest Expense	$ 243		$ 798		$ 75