Note 4: Loans and Allowance for Loan Losses (Details)			9 Months Ended
	Mar. 31, 2019 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)
Financing Receivable, Credit Quality, Additional Information			lending relationships of $1 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 $2.5 million are subject to an independent loan review annually, in order to verify risk ratings
Number of Purchased Credit Impaired Loans	1	2
Foreclosed residential real estate properties physical possession	$ 440	$ 472	$ 440
Residential mortgage loans and home equity loans formal foreclosure proceedings in process	873	331	873
Loans without a specific valuation allowance
Purchased Credit Impaired Loans	28,200,000	14,600,000	28,200,000
Financial Asset, Equal to or Greater than 90 Days Past Due
Purchased Credit Impaired Loans	$ 3,100,000	$ 1,100,000	$ 3,100,000