Note 4: Loans and Allowance for Loan Losses (Details)			9 Months Ended
	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)
Financing Receivable, Credit Quality, Additional Information			lending relationships of $2 million or more, exclusive of any consumer or owner-occupied residential loan, are subject to an annual credit analysis which is prepared by the loan administration department and presented to a loan committee with appropriate lending authority. A sample of lending relationships in excess of $1 million (exclusive of single-family residential real estate loans) are subject to an independent loan review annually, in order to verify risk ratings
Foreclosed residential real estate properties physical possession	$ 679	$ 752	$ 679
Residential mortgage loans and home equity loans formal foreclosure proceedings in process	592	493	592
Loans Without a Specific Valuation Allowance
Purchased Credit Impaired Loans	$ 23,600,000	$ 28,500,000	$ 23,600,000
Financial Asset, Equal to or Greater than 90 Days Past Due
Number of Purchased Credit Impaired Loans	0	3,100,000