Note 4: Loans and Allowance for Loan Losses: Performing Loans Classified as Troubled Debt Restructuring Loans (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018	Dec. 31, 2017
Total loans
Financing Receivable, Modifications, Number of Contracts	6	0	10	0
Consumer Loan
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Commercial Loan
Financing Receivable, Modifications, Number of Contracts	1	0	2	0
Construction Loan Payable
Financing Receivable, Modifications, Number of Contracts	0	0	0	0
Residential Real Estate
Financing Receivable, Modifications, Number of Contracts	1	0	1	0
Commercial Real Estate
Financing Receivable, Modifications, Number of Contracts	4	0	7	0
Performing Financial Instruments | Total loans
Financing Receivable, Modifications, Number of Contracts	41	34
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 13,148	$ 11,685
Performing Financial Instruments | Consumer Loan
Financing Receivable, Modifications, Number of Contracts	0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 14
Performing Financial Instruments | Commercial Loan
Financing Receivable, Modifications, Number of Contracts	10	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,950	$ 2,787
Performing Financial Instruments | Construction Loan Payable
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Performing Financial Instruments | Residential Real Estate
Financing Receivable, Modifications, Number of Contracts	11	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 1,273	$ 800
Performing Financial Instruments | Commercial Real Estate
Financing Receivable, Modifications, Number of Contracts	20	13
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 9,925	$ 8,084